And so it begins... with build pics!
Printed From: Speakerplans.com
Category: Plans
Forum Name: MT122
Forum Description: Discussion / Questions about the MT122
URL: https://forum.speakerplans.com/forum_posts.asp?TID=4766
Printed Date: 26 March 2026 at 11:31pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: And so it begins... with build pics!
Posted By: Heathrow_B_line
Subject: And so it begins... with build pics!
Date Posted: 23 April 2006 at 5:55pm
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The weathers getting better and i've got enough saved up to try and build some mt122 variants. Been lusting over them for a couple of months and flicking through julz' pics its just made me want to build then even more. i intend to build them with only one 12" and not two as per plan. Also i intend to reinforce the bottom and put a top hat mounting plug. this, however. needs to be investigating on my trial version as althougth it would be handy in some cases im not sure whether [a] the box will be too heavy to be supported on a speaker stand, and whether having 50kg on just a small pole would be stable/safe. either way my trial cab should answer most of my questions. as i said i will build one on its own (so if i get stuck i wont waste too much money!) then build 8. i was thinking about getting some fibreglass horns moulded but at the moment i think wood is a better option. reading the lab horn forum i often see that ppl have constructed special jigs to cut out the difficult bits... i think i'll try and replicate this. Hopefully i will get about 2 hours at work on monday to knock out some cad drawings in autocad so i can show u guys what exactly im thinking of doing... and if there are any glaring flaws! As a engineer i think having it laid out in cad will help me when it comes to generating a cutting list. if anyone else is building mt122's in the london area id welcome any input/show&tells... heres what ive found by searching all the mt122 threads.... ------------- Produce a killer sound. Take no prisoners. |
Replies:
Posted By: Heathrow_B_line
Date Posted: 23 April 2006 at 5:55pm
 ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 23 April 2006 at 5:59pm
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------------- Produce a killer sound. Take no prisoners. |
Posted By: Mark James
Date Posted: 23 April 2006 at 6:02pm
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oooooh they look so nice! ------------- insert silly sentence here |
Posted By: Heathrow_B_line
Date Posted: 23 April 2006 at 6:02pm
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advice from various threads...
don't cut the angles on the front of the horn, use a power planner and take of fine shavings until you get the right wafer thin edge. This is what i did with all my MT122's.
Something i've done (like timebombs suggestion) is to extend the top & bottom pieces to the front of the cab & only do small bit of the sharp mitre (so you only go a few milli's into the wood.)
You then end up with a well beefy looking cab & if you stopped it a cm further in, have a mounting for a grille too (i think they look too awesome to hide the innards though!) Otherwise as mal x posted a power plane is the way to go, the carbide tips last for years too (as long as you dont plane down too many wood screws!) As far as build sequence make the horn and the baffle first then build a box around them much easier.
there are enough angles on the plans to get you started, but you are on your own when it comes to calculating the angles of the flare components. if it helps, i found that a compound mitre angle of around 3.5 degress for the inner flare segments and the twice that for the outers was pretty close to being correct. as dom says, attempting to calculate them using trig is absolutely mind mangling, both he and i opted for a trial and error approach in the end. as i never cease to enjoy pointing out, there is not one square bit of wood in those cabintes.
------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 23 April 2006 at 6:19pm
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23-04-06 ----------------------------------------------------------- order P Audio SN 12B Neo order P Audio BMD 2723 order P Audio PH2723 Horn From proaudio parts ----------------------------------------------------------- Buy electric plane buy belt sander buy compressor and nailgun and spray gun buy ply to cover pool table [7ft x 4ft] buy black and decker work mate buy 18mm & 12mm ply [maybe get cut to length in store] buy router [will i really use it?] ------------- Produce a killer sound. Take no prisoners. |
Posted By: james folkes
Date Posted: 24 April 2006 at 3:05pm
yes!!!! routers make sinking the recesses for your handles a doddle, cutting the round baffle holes a dream and they could be considered almost essential for rounding over the edges of your finished boxes. you could do it with the belt sander i suppose, but it will be quick, simple and precise with your friend the router. james. ------------- mardy hippy. |
Heathrow_B_line wrote:Posted By: Heathrow_B_line
Date Posted: 24 April 2006 at 3:32pm
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it would nice to have this jig.... to cut the circles out
------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 24 April 2006 at 3:33pm
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------------- Produce a killer sound. Take no prisoners. |
Posted By: james folkes
Date Posted: 25 April 2006 at 5:24am
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ooh, i've got a little slack and pecker one just like that shown in the first
picture, that is my rounding over machine and is permanently set up for this task. the bit i have got is a bit bigger than the one shown in the second picture, i think the slightly smaller size would have been better, especially when it comes to rounding over two edges (eg mouth braces). the jig shown in the first picture will be a doddle to make, but to be fair my other two 1/2" machines came with a locating pin which goes on one of the fence rods enabling simple circle cut outs. it is plenty accurate too. if you are feeling particularly trick you could even use the rebated dado rail or tongue and groove construction, for which a router will be absolutely essential. it really does help the boxes come together more easily and accurately. just noticed the "ply to cover pool table". nice. what with that and your crt projector home cinema you must have quite a tricked out crib, i'm assuming you are saving pictures of the roof mounted hot tub for later... james. ------------- mardy hippy. |
Posted By: Heathrow_B_line
Date Posted: 25 April 2006 at 7:19am
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u know us london fellas... we like our toys! tried to sell the pool table on sj awhile back to clear some space in my garage but mite come in handy now as a huge 7ft by 4ft work table... u always seem to run out of space when u start building things! im still unsure what primary saw to go for... ive already got a cheap £50 table saw for argos lurking somewhere in my shed... it does mitres but im thinking of maybe get a circular saw and making the aforementioned jigs to cut big pieces with and use the table saw for the mitre cutting. definitely get a router as there dirt cheap in screw fix! ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 25 April 2006 at 7:31am
 ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 25 April 2006 at 7:32am
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------------- Produce a killer sound. Take no prisoners. |
Posted By: Jimbo
Date Posted: 25 April 2006 at 1:36pm
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OK,,,, I'm really cheap! For my "Circle jig", I just screwed a piece of 1/8" (3mm) ply to the bottom of my old B&D cheapy router. Measured and drilled a hole where I needed it. Router,, $0 (gift from my first mother in law). Ply,, $0 (left over from a model airplane I built). Total cost of jig "FFRRREEEEBYY" Jim |
Posted By: Heathrow_B_line
Date Posted: 25 April 2006 at 8:52pm
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want some of them blue things too! ------------- Produce a killer sound. Take no prisoners. |
Posted By: angus
Date Posted: 26 April 2006 at 9:03am
ditto - cheapo alert!  |
Posted By: Jimbo
Date Posted: 26 April 2006 at 10:30am
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Angus,, You stole my idea! I've got some of the angle clamps that I bought at Harbor Freight for about $3 US each. I break them from time to time, but for that price, who cares. Jim |
Posted By: angus
Date Posted: 26 April 2006 at 12:00pm
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yeah, the router was 25 quid from screwfix.com but can't complain - it does the job! I think it was Dom that said he'd picked up angle clamps from Wilkos in the UK dirt cheap. (currently listening to my X15s as my living room speakers - must find time to finish them off properly and start the next lot...) |
Posted By: Jimbo
Date Posted: 26 April 2006 at 1:14pm
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@angus... Where's the pics? Jim |
Posted By: Heathrow_B_line
Date Posted: 26 April 2006 at 4:36pm
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QUESTION 1: As i may have already said i plan on making 8 mt121's if all goes to plan... thinking about this my mind got to thinking about el dirtos and his addiction with void and in particular his stasys 3's... now when i was doin his gallery for his website i noticed that all the stasys 3's were always placed close together almost in a line... and if ive read enough threads im told that using a normal dispersion cab, eg my behringer 1520's, in this configuration would cause severve phase anomalies and comb filtering! with me so far?! but as i understand it the mt122 has more then enough power to cover a large out crowd but u need a few cabs as they are highly directional... abit like the stasys.... thats why instead of building 4 mt122's im building 8 mt121's, ok?! my question is is it possible to make the mt121 more directional [ie similar to the dispersion of the stasys] by maybe altering the second flared section OR would this mess things up?! what do u guys think?
------------- Produce a killer sound. Take no prisoners. |
Posted By: Dom
Date Posted: 26 April 2006 at 6:02pm
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How directional the 12" section is dependant on what frequency you cross them over at to the tops. If you're crossing them fairly low then there's no real control due to the size of the mouth. How directional the tops are will depend on the horn used and the crossover point. The way to avoid comb filtering is stack boxes vertically. That's why the original box has 2 12"s stacked vertically. People don't tend to move round your rig in a vertical plane.... The other way to avoid phase cancellations and comb filtering is down to driver spacing. ------------- "It sounded like a million fire engines chasing ten million ambulances through a war zone and it was played at a volume that made the empty chair beside me bleed." |
Posted By: Heathrow_B_line
Date Posted: 02 May 2006 at 6:21pm
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ive just started drawing the plans in cad and ive realised the reason why so many ppl have trouble building these cabs is that the plans are slightly wrong... i'll try and do a print screen in cad and show u what i mean if not i'll print it out and scan it at work... its the inner and outer verticle flares that are effected... the plans seem to be [i will double check when im not so caffeened up] out by 3.76mm in the y axis and 0.76mm in the x-axis... http://imageshack.us/?x=my6&myref=http://www.imageshack.us/" target=_blank onclick="return fitsInWindow;">
so the red line represents where it should be as per rogs plans.... maybe ive just made a mistake somewhere but i wont know until i put the dimensions on in another layer.... but ive checked it by measuring the angles and it seems to be 12 and 24 degrees.... anyone else notice this? ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 02 May 2006 at 6:59pm
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------------- Produce a killer sound. Take no prisoners. |
Posted By: super-hero
Date Posted: 02 May 2006 at 7:15pm
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Will the single 12" keep up with the comp? 50kg on a tripod is too much I think. They are not the most secure things and do you want to risk someone knocking one of your speakers over. I try to avoid speakers on stands if the general public are going to be anywhere near them. ------------- I'm not an animal, I'm a human being. |
Posted By: Heathrow_B_line
Date Posted: 02 May 2006 at 7:27pm
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just messing about....
------------- Produce a killer sound. Take no prisoners. |
Posted By: Mark James
Date Posted: 02 May 2006 at 7:28pm
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imho the best stands for mid top speakers in the world has to be..........................................
a phat stack of bass bins! a helluvalot better [in my opinion and prolly my opinion only!] than any tripod quadpod or zillionopod [dont exist i know but hey] ------------- insert silly sentence here |
Posted By: Fushion Julz
Date Posted: 03 May 2006 at 5:14am
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Never quite sure why people want to change the design to make the 2
mids together with the top on top...Surely the advantage of the
original design is that you avoid most of the combing problems by
seperating the mids and the cab works as a line source having the
drivers in the original configuration... Single 12" cabs have the advantage you can array them in a side-by-side configuration to acheive more dispersion, but you won't need one compression driver for each 12" mid!! Even the 2-1 ratio in the original design is a bit top-heavy using CP800Ti for the tops. ------------- FUSHION SOUNDSYSTEM http://www.fushion.org.uk - www.fushion.org.uk |
Posted By: Mark James
Date Posted: 03 May 2006 at 5:37am
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so are the plans wrong then? ------------- insert silly sentence here |
Posted By: Fushion Julz
Date Posted: 03 May 2006 at 5:45am
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Actually, when I made mine, I cut the horn flares to match/fit the
*actual* fitting...starting with the top/bottom screwed to one outer
side panel and with the lines for the side parts of the flares drawn on
the top and bottom of those flares... The original cut I made (from the plans) didn't fit and I came up with that way as the easier (and quicker) method rather than trying to work it all out in Autocad, or similar, and STILL getting it wrong in practice.. Once I'd done the first one, I just copied another 3 times and it all went together pretty well! ------------- FUSHION SOUNDSYSTEM http://www.fushion.org.uk - www.fushion.org.uk |
Posted By: Mark James
Date Posted: 03 May 2006 at 7:03am
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i think james used a similar methode. ------------- insert silly sentence here |
Posted By: Heathrow_B_line
Date Posted: 03 May 2006 at 1:56pm
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dont know about quicker.... it only took me 40mins to draw it in cad, probably would have taken me just as long to mark it all out and then realise i messed it up... 2d cad can only get u so far though, i think with 3d cad u can create a model that u can prove to urself is correct. the plans arent incorrect, its just to get the flares at 12 degrees and 24 degrees there slightly off from where they should meeet. i like the mt121 design as its just a handy dinky thing rather then the full on mt122. i wouldnt mind changing the high freq horn...any suggestions? i agree that the stacked 12 mids are silly but they look funky u have to admit! i was thinking about maybe doing something like the turbo sound cabs and join a mt121 with a hd15 and see how that looked.... mite build a pair just for fun! ------------- Produce a killer sound. Take no prisoners. |
Posted By: Men@work
Date Posted: 03 May 2006 at 5:50pm
------------- At the end of the day its gets dark!! THEN WE PARTY |
Posted By: Heathrow_B_line
Date Posted: 03 May 2006 at 6:36pm
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i just found some in a local hardware store for £3 each... i bought 6! like u do! ------------- Produce a killer sound. Take no prisoners. |
Posted By: Dom
Date Posted: 09 May 2006 at 8:08pm
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MT122s are not dinky. They are backbreaking... I am really interested in getting some of those angle clamps... Do they have a name, manufacturer etc??? ------------- "It sounded like a million fire engines chasing ten million ambulances through a war zone and it was played at a volume that made the empty chair beside me bleed." |
Posted By: Heathrow_B_line
Date Posted: 10 May 2006 at 3:21am
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I never said they were.... i've found them clamps on the net, i'll post a link when i get a chance... £4 though! ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 11 May 2006 at 6:28pm
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i think i have a clamp fetish.... i keep buying the f**kers. ive got f-clamps, g clamps, those corner ribbon clamps, mitre clamps, carpenters clamps/spreaders, saw guide clamps.... and i always seem to buy in quanities of 2 or 4. i need to join a support group i think! ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 12 May 2006 at 6:11pm
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finally bought some actual wood! no goin back now!!! ------------- Produce a killer sound. Take no prisoners. |
Posted By: Mark James
Date Posted: 13 May 2006 at 4:02pm
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what about a car clamp? no its not but its crap ------------- insert silly sentence here |
Posted By: Heathrow_B_line
Date Posted: 14 May 2006 at 4:36pm
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f**king had a sh*te weekend! instead of being stuck in my garage covered in saw dust i was dragged to a wedding in slough for near enough the whole weekend including friday. not even the chance of checking out the djs rig turned out to be much consolation as they turned up with 4 ev t18 copies and 4 ev tops.... sounded like pure crap - boomy with no b line. i was sitting about 3m to one side of the rig and could happily talk to my bro in law without any shouting needed. oh well mite try and do something in the evenings when i get back in from work. still i was looking forward to it for ages. ------------- Produce a killer sound. Take no prisoners. |
Posted By: Men@work
Date Posted: 15 May 2006 at 3:38am
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could you post a link to those blue angle clamps mate ------------- At the end of the day its gets dark!! THEN WE PARTY |
Posted By: Heathrow_B_line
Date Posted: 21 May 2006 at 5:08pm
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just started building this weekend and i forgot how tiring it can be.... i think its a real help having another person around to help you/talk to you/bring you cups of tea.
heres some more on my clamp fetish... i think all i need is those one handed yellow spreader clamps then i'll be done. those double headed g clamps are a godsend though.... glad i sent the extra to get them. those 1m f-clamps are also proving handy but the variable mitre clamps have come in most useful - bit of a crap tightening mechanism though during most of yesterday i wondered why most of my cuts have been about 0.25 degrees out. i initially thought it was me clamping my wood at an angle before cutting but infact it was the blade on my circular not being set perfectly straight [even though it was set to 0 degrees angle]. a quater of a degree isnt much but just got me wondering why things werent perfectly flat when checked with a engineers square... looking foward to work 2mrw to get a break from the carpentry! ------------- Produce a killer sound. Take no prisoners. |
Posted By: mykey
Date Posted: 22 May 2006 at 12:12am
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reminds me of a friend of mine who went out and bought tools to remove the old lead pipes from his house so that get some money when he sold the lead he got less than what the tools were bought for ------------- ......just all them hanging there like giant bananas. |
Posted By: norty303
Date Posted: 22 May 2006 at 5:30am
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Come on, lets be sensible here, how do you measure 1/4 of a degree over a 18mm distance with wood being the soft material it is (i.e. compressable)? ------------- My laser stuff: http://www.facebook.com/SubsonicSystems" rel="nofollow - Frikkin Lasers |
Posted By: ceharden
Date Posted: 22 May 2006 at 8:04am
Accurate cuts? Nah! Don't need to worry about things like that when
you've got expanding glue and car body filler to tidy up after!  |
Posted By: Heathrow_B_line
Date Posted: 22 May 2006 at 1:53pm
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havent tried that expanding glue yet...mainly because of the speed at which it goes off. 5 mins or something aint it? ive been using that exterior evo stick stuff, seems to be quite good. ive used screws as well so i guess it doesnt need to take 100% of the load. i suppose the expanding stuff is good on certain joints but i think i'll stick to the evo stick stuff [no pun intended] till i finish the 1L bottle off ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 01 June 2006 at 7:51pm
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still havent got round to building the mt121's! its funny how things take much longer then u thought they would. still trying to sort new woodworking bench / cutting bench. has anyone tried anything like this... and if so how did the rate the accuracy of the cuts? i cant see any major problems apart from the rails flexing slightly but if u only push the circular saw in the direction of the cut it doesnt seem to be too bad. general 'T' shape layout. 4m long, 0.7m wide with the cutting limb being 1.5m wide.
so the black things are metal 'L' beams which allow the circ saw to slide up and down it...
wood to be cut fits between black rail and wooden frame
the idea was to be able to cut a whole 8ft by 4 ft shhet width ways. i think if i had the cash and could justify it id get a festol saw and guide but at the mo this will do as the metal costs £12 and wood acouple more pounds. i have assumed that any small 'wobbles' in the metal rails would be straightened out by the length of the circular saw...but again im not sure. has anyone tried anything like this before? i saw that diy cnc thing... i asked a guy at work whos really into steam and steam engines and apparently alot of ppl have made similar machines. and its supposed to be quite straight forward. that would be quite phat - having a cnc machine in ur shed! ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 01 June 2006 at 7:57pm
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also what kind of extraction do u lot use? the old hoover connected to the circ saw takes care of some of it but not all of it. can anybody post and industrial hoovers up? another thing was its the dust from birch also hazardous like mdf dust? i got thinking about it as all 13 laminates need to be glued... and isint it the glue in the mdf thats the ral bitch. lastly mdf is widely availible but how easy is it to get hdf? ------------- Produce a killer sound. Take no prisoners. |
Posted By: james folkes
Date Posted: 02 June 2006 at 7:07am
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that guide rail system you've got going there really looks good, hopefully
it should guarantee you some accurate results. as with most of these things, it comes down to spending ages and ages tweaking and measuring your jigs and getting them all perfect and then it just gets quick and effortless! saw you mentioned diy cnc so i had a quick google. whoa!!! i now want to build a cnc machine, lots! to be fair, if greame centauri hasn't done it yet then i don't think i'm capable, but i can dream... regarding dust, yeah i just use the hoover and dust extraction nozzles on the tools, it ain't perfect but that and some masks and you are probably gonna be ok. awesome clamp collection by the way. james. ------------- mardy hippy. |
Posted By: Heathrow_B_line
Date Posted: 15 June 2006 at 12:59pm
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ive nearly finished my wood working bench and am soon to start actual construction soon. i have looked at getting a festool circular saw instead of the rail system but im still not got the £400 spare yet, maybe next payday me thinks. ive chosen to use a more rigid version of the saw board design previously posted on the forum. i think this should do me fine until the festool can be afforded/justified, #'ll post a pic later. one good thing about it is the dust extraction facility is said to be really good, with almost no dust even when cutting mdf... this can only be a plus point. still havent found anywhere selling it cheaper then £350 though. im getting my compressor delivered soon and it came with a free air kit including spray gun. i was wondering what kinda spray gun i would need to get that splatter finish? my plans have changed somewhat, so instead of making my mt121's first i will be making the hd215's. i [stupidly] mentioned my up coming speaker build to a close mate and now have somehow agreed to make 16 hd215's... luckily i will just be cutting the wood for his 8! i started drawing the hd215 in cad but got distracted by other things and now that im revisiting it i think to myself that if i rebate the 5 sectional curve into the all sides or the cab i dont really need the brace. would be quiet challenaging though to route your initial router template out, mite look at getting that cnc'd i cant do it on my own. i have a couple questions in terms of materials.... as in where would be the cheapest places to buy the following... -18mm 13 laminate birch ply [10 sheets] -100mm castors [x50] -handles [x50] -grill [x32] -2 connector speakon plates [x25] if anyone knows any places cheap let me know, id prefer somewhere that could deliver cheaply to london as i expect to need goods despatched monthly. i mite try and have ago and a revised cad plan on the weekend but what the result be if i extended the battern round the lip of the cab to the 5 sectional curve? it it play higher and lose some low end?! this would be ideal as i intend to run some sub under it anyway. i mite try having a crack at a mdf mt121 at the weekend too...depends how much free time if left! those angles would be a great challenage for the new saw board system! ------------- Produce a killer sound. Take no prisoners. |
Posted By: mykey
Date Posted: 16 June 2006 at 10:16am
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good idea but you dont need 2 metal rails hbl, they will get on your nerves after a while just get yourself a thicker / larger guage 'L' bar and clamp at either end or do what i used to do (during the war then for the saw guide use some thick guage 'L' bar drilled at either end with some butterfly (wing ) nuts and large washer's then cut/router your self 2 lines horizontily all the way through your bench then attach your 'L' bar and wing nuts, this will then slide up and down for your guide you could even mark the bench for all your cuts as for wheels..im doing 4 for 20 quid or 6 pound each the blue 100mm joby's check my sight for pic's grills & speakon plates... Clarke Campion ply... JH timber, he has 5x5ft 18mm slight seconds just cut the edges off and the festool is ok for sight work mobile use, you have a fixed bench which is better so dont waste your money, instead spend it on a dust extractor from "Machine Mart" very cheap ------------- ......just all them hanging there like giant bananas. |
Posted By: Heathrow_B_line
Date Posted: 19 June 2006 at 12:17pm
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hi mykey thanks for the info... have u got any contact info on this jh timber place? ive settled on a sawing board design that is held in plave by some smaller wedges... i'll post a pic when i have time. i think something like a festool saw may still be better then my current set up as it is on a fixed rail rather then being restrained only on one side. ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 03 August 2006 at 1:26pm
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has anyone used the P.Audio PH 220 with the P.Audio BM D450 for an mt121? im not sure if this would work esp when u try and use a few together... would the dispersion be increased? would this result in comb filtering if using a couple per side? ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 03 August 2006 at 1:34pm
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opps.... should have searched!
http://www.speakerplans.com/forum/forum_posts.asp?TID=916&PN=2 - http://www.speakerplans.com/forum/forum_posts.asp?TID=916&PN=2 ------------- Produce a killer sound. Take no prisoners. |
Posted By: Dom
Date Posted: 16 August 2006 at 2:54am
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So.... Almost four months down the line, what happened first? You finish the cabs or lose your marbles?
------------- "It sounded like a million fire engines chasing ten million ambulances through a war zone and it was played at a volume that made the empty chair beside me bleed." |
Posted By: james folkes
Date Posted: 16 August 2006 at 6:57pm
oh dom, be fair... i think we took about 7 months to build ours. possibly more. and never mind losing marbles, i still can't find my sodding belt sander! james. ------------- mardy hippy. |
Posted By: Heathrow_B_line
Date Posted: 17 August 2006 at 1:06pm
no, im all hype i bet it'll never happen knowing me. ------------- Produce a killer sound. Take no prisoners. |
Posted By: Mark James
Date Posted: 17 August 2006 at 9:14pm
i thought that about myself,,,, then again we got a long way to go tooo! ------------- insert silly sentence here |
Posted By: Heathrow_B_line
Date Posted: 20 August 2006 at 1:01pm
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some pics from the bat cave...
p audio sn12mb
http://imageshack.us/?x=my6&myref=http://load.imageshack.us/">
 http://imageshack.us/?x=my6&myref=http://load.imageshack.us/">
 the wrong horn
 ... http://imageshack.us/?x=my6&myref=http://imageshack.us/">
 http://imageshack.us/?x=my6&myref=http://load.imageshack.us/">
 the wrong cd...
http://imageshack.us/?x=my6&myref=http://imageshack.us/">  ------------- Produce a killer sound. Take no prisoners. |
Posted By: Mark James
Date Posted: 22 August 2006 at 1:05pm
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is the sn12mb horn loadable... ------------- insert silly sentence here |
Posted By: Heathrow_B_line
Date Posted: 22 August 2006 at 6:39pm
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pap seem to think so....
i know have these too! [insert more incorrect horns]
  ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 22 August 2006 at 7:00pm
http://imageshack.us/?x=my6&myref=http://www.imageshack.us/">
http://imageshack.us/?x=my6&myref=http://www.imageshack.us/">
 http://imageshack.us/?x=my6&myref=http://imageshack.us/">  ------------- Produce a killer sound. Take no prisoners. |
Posted By: Insomnia
Date Posted: 23 August 2006 at 8:53pm
have u started building yet? 
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Posted By: james folkes
Date Posted: 24 August 2006 at 9:04am
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ooh... i think i know where you got those horns from! they looked like a good choice for mt122 style boxes, let us know how you get on...
james. ------------- mardy hippy. |
Posted By: Heathrow_B_line
Date Posted: 24 August 2006 at 9:57am
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yo james i got them off super percy for £9 each. i was abit worried about the fact they werent metal but they seem just as solid as the metal ph220 horns i got! seemed like the right bargian spotted at the right time! ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 06 November 2006 at 1:11pm
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i know dom uses some drivers to do super high frequncies.... does anyone else? ------------- Produce a killer sound. Take no prisoners. |
Posted By: norty303
Date Posted: 06 November 2006 at 2:52pm
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Fane slots, but then they are Dom's old cabs so........ ------------- My laser stuff: http://www.facebook.com/SubsonicSystems" rel="nofollow - Frikkin Lasers |
Posted By: Heathrow_B_line
Date Posted: 06 November 2006 at 6:02pm
cheers, got that off the readers projects bit. im thinking about adding something like that but im not too sure. what kinda freq does the mt122 play upto? theres no response graph like the bass cabs  ------------- Produce a killer sound. Take no prisoners. |
Posted By: james folkes
Date Posted: 07 November 2006 at 8:37am
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high cut-off will be determined by the choice of compression driver and horn. you picked up some bargain bm-d750s yeah? they can play pretty high according to the spec on the p-audio site, but you will probably find you need to use an eq setting for the constant directivity horn in order to keep the output flat up to 16/17k. some crossovers have a button for cd horns (eg some of the behringer super-x models), some have an internal modification (rane ac22b) but the basic priciple is a slowly rising boost in eq above something like 6k to counteract the natural roll-off.
james. ps, 7 weeks or so till christmas... reckon you'll have 'em done in time? ------------- mardy hippy. |
Posted By: Heathrow_B_line
Date Posted: 07 November 2006 at 1:07pm
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i have been busy and have 4 weeks of holiday coming up so i think christmas is still on the cards!!! if not xmas, then definitely the first week of jan.
My problem is i take things to the n'th degree and keep making refinements even when there not necessarily needed. like with the hd's im doin - ive near enough made templates to rebate every single panel using my router. i suppose as i dont make cabs to sell i fall into that trap of just doing extra work as i will know i did it... even if they dont sound any different to slap them together the normal way.
i will most definitely use the bmd750 as it is in my price range. if i used the sd 750n neo would i still get this roll off at 16/17k? ------------- Produce a killer sound. Take no prisoners. |
Posted By: james folkes
Date Posted: 08 November 2006 at 11:01am
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both bm d-750 and sd-750n roll of way before 16k (looking at the manufacturer's specification), although the neo looks to be admirably flat up until 10k. no mention of what horn the plots are made on... neos are supposed to be a bit better at the higher stuff, although i'm not quite sure why, or if that doesn't only apply to small format cone drivers! i think it is something to do with the density of magnetic field lines...
interestingly, jody said the 2" drivers in the opuspocus systems will play up to 22k, although he stressed that is only possible with analogue processing... i know exactly what you mean about refining this, tweaking that, making a template for the other; you remember that 215 i started this time last year? quite. it got made redundant by my huge pile of martin bins, but i might finish it off this winter. there's quite a lot of rather nice wood tied up in that box... keep us posted on progress. james. ------------- mardy hippy. |
Posted By: Heathrow_B_line
Date Posted: 22 November 2006 at 2:59pm
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current thoughts are to make this design with a bigger p audio flare and no tweeter...
http://imageshack.us/?x=my6&myref=http://www.imageshack.us/">
 but things are getting abit bigger then i had hoped for.... i wanted the front view to be a square but that seems abit difficult to achieve. i think the reason why everyone struggles more then usually is that the plans are slightly out so if you assemble to the plans it will never fit together. ------------- Produce a killer sound. Take no prisoners. |
Posted By: Laurence G
Date Posted: 29 November 2006 at 9:27pm
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For castors check out 'BES Castors'
Did me an incredible deal on 100mm blue swivel castors when I built the punishers... |
Posted By: Heathrow_B_line
Date Posted: 30 November 2006 at 5:05am
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any chance of a link or contact info matey? ------------- Produce a killer sound. Take no prisoners. |
Posted By: Laurence G
Date Posted: 30 November 2006 at 7:38am
| 01274 309 071 |
Posted By: jethrocker
Date Posted: 03 December 2006 at 12:12pm
Ah-ha.. That explains it. I started to knock up some MT flares some years back (never got round to finishing them in the end).. I found that things didn't seem quite right and posted here (under my old user name before my account vanished) to be told I must be measuring wrong as the plans were 100% ok.
At last I can sleep at night now ..
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Posted By: Heathrow_B_line
Date Posted: 16 December 2006 at 4:20pm
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with the porn horn mk 2 out in 2 months i cant decide whether to switch to that or stick with the mt121 design!!! the mt121 will work out cheaper but take longer to build....
the porn horn mk2 will play louder and sound nicer [i assume it would sound better anyway] ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 20 December 2006 at 9:54am
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working out some numbers and it seems the porn horns will be at least £200 more expensive per cab then the mt's so i think i'll stick with these now. ordered the p.audio 2723 horn and bmd750 so that should be with me soon... i think after ive built one i mite see what the bmd450 sounds like in this cab
i was gonna start off by just trying to make 4 for myself but now a mate wants me to make him two too so 6 is the magic number now! the only thing is he wants them for new yrs eve which blatantly isnt going to happen!
but we shall see ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 20 December 2006 at 9:56am
by the way these folks are abit dear... they were trying to charge £4 for a blue 100mm and £6 for a 100mm braked castor!!!
thought they were ment to be cheap.... ive sourced some far cheaper ones now but i think they will be with me by jan ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 01 January 2007 at 10:05pm
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ive seen nexus 3 post a design with 2 mids with one tweeter mounted in a 'floating' fashion. what would the effect be to use this type of system in the mt122? would it mess up the sound hugely?  it seems like a good way to reduce the size of the cabinet. ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 09 August 2007 at 2:56pm
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to save weight i have decided to use 18mm spruce instead of birch and 12mm brazilian birch
the spruce is noticeably lighter but the surface doesnt seem as smooth as birch. I guess this is because spruce is less dense when compared to birch
 ------------- Produce a killer sound. Take no prisoners. |
Posted By: Fushion Julz
Date Posted: 10 August 2007 at 1:05pm
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Jaysus, chap!! 18mths since you first decided to build and you are still procrastinating! Think mine took (back in autumn 03) about 6 days in total...and I wasn't being quick! Could have built a factory to manufacture the feckers in bulk by now!! Any chance you would have them finished before you peg it? ------------- FUSHION SOUNDSYSTEM http://www.fushion.org.uk - www.fushion.org.uk |
Posted By: Heathrow_B_line
Date Posted: 10 August 2007 at 1:34pm
i was thinking of starting them and maybe passing it on to my kids as a legacy for them to finish....
 in my defense i have decided to go for porn horns rather then mts.... im only building some to compare them to the porns. probably wont even use them if the pron horns are as good as the hype leads me to believe
so day one of the build is today.... lets see how long it takes ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 11 August 2007 at 5:28pm
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some quick tips....
when cutting the flares into a trap shape make one, clamp it together and saw all panels you need at once... thought of this once i had finished cutting each one individually.
when cutting the acute angles for the flares its much easier to cut one longer sheet then loads of smaller pieces. So i think its easier to cut the 13 degree angle on say a 2m length rather then 4 50cm length as the ends are the trickiest bits. ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 12 August 2007 at 12:43am
Firstly it should be stated that the speakerplans for the mt122 must be either wrong or misleading as working from my own plans i have built the mid flare section with no problems. Maybe the difficult bit is yet to come???!!! 
I cut everything to my plans and everything seems to fit nicely together... i have assembled the horizontal flare and the inner vertical flare;. I will attach it to the baffle next then fit the whole thing into the trap box, attaching the outer vertical flare last of all.
If i ever make some more i think i would prefer to use 18mm all over rather then mess abit with 12mm
Here are some trade mark HBL pics...
      ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 12 August 2007 at 8:50pm
  ------------- Produce a killer sound. Take no prisoners. |
Posted By: tommysb
Date Posted: 29 August 2007 at 3:27pm
| What kind of wood you using HBL? |
Posted By: Heathrow_B_line
Date Posted: 30 August 2007 at 12:37am
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hi there
18mm spruce for the trap box to save weight and 12mm brazilian birch for the flare. ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 05 September 2007 at 11:06pm
some pics as promised
       ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 05 September 2007 at 11:09pm
MT 121 with P audio SN 12 MB and P Audio BMD 750. This is basically one horn from the MT 122 design and a BMD 750 on P audio horn above it. I don't know which P Audio horn was used. I called this MT 121.
The MT 121's 12" horn would have nearly kept up with the porn horns if it had a phase plug. You can see its response below 400Hz is good, but it drops below this. Theres still more output around 1KHz though with the MT 121 12" horn and with its lower 1.7KHz crossover point the 12" horn nearly met the 2" driver. I quite liked the sound of the MT 121, but its poor HF extension was evident and made it sound a bit flat. Distortion was also high with the P audio 2" driver.
MT 121. Good output from the 12" horn, nice smooth sound and good punch.
more info in this thread
http://www.speakerplans.com/forum/forum_posts.asp?TID=11586 - http://www.speakerplans.com/forum/forum_posts.asp?TID=11586 ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 10 September 2007 at 8:01pm
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some more pics of the HBL dance stack...
slow but steady progress.
       ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 10 September 2007 at 8:25pm
now blue
  ------------- Produce a killer sound. Take no prisoners. |
Posted By: sukebe
Date Posted: 10 September 2007 at 10:56pm
| Is that paint 'Turbosound blue'? |
Posted By: Heathrow_B_line
Date Posted: 10 September 2007 at 11:03pm
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yup... i dont use any other colour!
it doesnt look its best because its the first coat... the first coat always makes the grain to show through and feels rough to the touch. Needs another sand over and then another coat to really look that sexy turbo blue colour.
eventually it goes the same colour as my hd215s...
 ------------- Produce a killer sound. Take no prisoners. |
Posted By: Ciscokid
Date Posted: 10 September 2007 at 11:09pm
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HBL,
Paint finish looks good.Did you spray it on or did you use a roller?
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Posted By: Heathrow_B_line
Date Posted: 10 September 2007 at 11:14pm
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it was all rollered on... i have a spray can but i cant figure out how to use it at the mo and havent got the time to learn. But sometimes the roller is less messy anyway. the roller was just a cheapo one from b & q. i foned Aldcroft the paint ppl and the recomended the open-cell roller [i think]... its basically the foam one and NOT the furry/fluffy one.
i have used the fluffy one before i knew not to use it and all that happens is you use alot more paint and the end finish isnt as nice. ------------- Produce a killer sound. Take no prisoners. |
Posted By: Heathrow_B_line
Date Posted: 11 September 2007 at 9:16pm
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------------- Produce a killer sound. Take no prisoners. |
Posted By: Tekasis
Date Posted: 13 September 2007 at 4:24pm
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Aren't the following similar to these MT121's with just the 12'' mid section & the comp cut-off ?
http://imageshack.us/?x=my6&myref=http://load.imageshack.us/">
 http://imageshack.us/?x=my6&myref=http://www.imageshack.us/">
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Posted By: TONY.A.S.S.
Date Posted: 13 September 2007 at 4:48pm
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Heathy. With a perfectly round speaker why isn't the rectangular hole square .Your Horizontal dispersion could still be achieved with a different dimension.
------------- http://www.facebook.com/tony.rossell.3" rel="nofollow - http://www.facebook.com/tony.rossell.3 |
Posted By: josh
Date Posted: 13 September 2007 at 6:10pm
| tek ...i think from the ground upwards high pressure use super scoopers g subs, the mid horns from mt122 and some 1" comps |
Posted By: Tekasis
Date Posted: 13 September 2007 at 6:25pm
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I think your right Josh - So you recognised their cabs! They didn't sound too bad in an open-air function in Leeds back in August.
Four 1'' comps one on top the other! I'm sure one fat 2'' comp & four bullets would've nice up that stack?
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