SPEAKERPLANS - DM 2
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Category: General
Forum Name: Feedback Forum
Forum Description: How Your Projects Perform
URL: https://forum.speakerplans.com/forum_posts.asp?TID=14093
Printed Date: 20 April 2024 at 5:51am
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Topic: SPEAKERPLANS - DM 2
Posted By: Strange Daze
Subject: SPEAKERPLANS - DM 2
Date Posted: 24 January 2008 at 9:04am
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http://www.speakerplans.com/index.php?id=dm2 - http://www.speakerplans.com/index.php?id=dm2
HEY ALL....Was just wondering if anyone has build this cab.....
Just realised ive got all the neccessary bits to make a pair.....just from stuff that lying around... (would only be used as a side fill, stood atop a single 18" reflex)
Any feedback appreciated....
I imagine firstly that they are pretty heavy??
cheers,
Chris.
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Replies:
Posted By: Disco Stu
Date Posted: 24 January 2008 at 1:11pm
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Since its already a massive box I would be inclined to split it into 2x15 underneath, 2x10 and horn on top.
Stu ------------- All you need to know is: Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
Posted By: Strange Daze
Date Posted: 24 January 2008 at 1:40pm
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I can see why that would be handy.
(but to be fair....if they we're seperate, i wouldnt deem them 'castor' worthy (laughs)
.......you ever heard one 'as is', in the design??
.....
cheers,
Chris
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Posted By: Disco Stu
Date Posted: 24 January 2008 at 1:54pm
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I have heard the Delta 10s, not great you could probably use the Deltalites these days that would cut down the weight significantly
Again with the Kappalites, but you said you already have the right drivers. It all depends if you already have big cabs you haul around really, that sort to sized box wouldnt fit anywhere near any vehicle apart from a van. And if you split it you could probably use the 2x15 on its own as a small sub in a mobile rig, so it would just enable some flexibility. Also having the 10s at the same height as the 15"s would mean you have to get the mids up to ear level, which means it must always be put on a bass bin or platform Stu ------------- All you need to know is: Sensitivity + Power Handling - Power Compression = Max Output My acts: www.myspace.com/thebowiexperience www.myspace.com/scheisseelektronisches |
Posted By: Strange Daze
Date Posted: 24 January 2008 at 3:49pm
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mmmm.... food for thought ;)
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Posted By: ceharden
Date Posted: 24 January 2008 at 8:25pm
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Basically the DM2 is a rather old school design, not exactly refined. It's a simple way to make a loud, full range box. If you had those components I'd suggest building some single 15",10"+HF boxes in a more conventional column arrangement. Maybe two 15" drivers per box if you really wanted. There's lots of ways of doing it but the DM2 as-is probably isn't the way to go.... |
Posted By: godathunder
Date Posted: 24 January 2008 at 10:25pm
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if you plan on using them as sidefills Im not sure I see the point of an 18 underneath other than raising the dm2 to head height. more bass wash on stage=more mud in mains ------------- LOUDER THAN LOUD |
Posted By: Mark James
Date Posted: 24 January 2008 at 11:02pm
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another thing about splitting the dm2 in half if you needed a whole dm2 per side [ie two halves] then youd be possibly running into dispersion problems, as from what i know reflex cabs are hard to array? ------------- me so horny me love you long throw horn loaded for her pleasure |
Posted By: ceharden
Date Posted: 24 January 2008 at 11:16pm
| Reflex cabs are no harder to array than horns, especially since the top end (the important bit to get the arraying right) is usually still horn loaded anyway! |
Posted By: Mark James
Date Posted: 24 January 2008 at 11:23pm
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aha like i said i know very little about dispersion to be hoest, so can you stick something like four x10 in one pile? [splayed or trap cabs] 2 per side without combing issues? forget what i said prevously! no dont forget it, just note it as false info. ------------- me so horny me love you long throw horn loaded for her pleasure |
Posted By: CLsystems
Date Posted: 24 January 2008 at 11:42pm
| if you decide to make one ive got some passive crossovers that would suit. |
Posted By: ceharden
Date Posted: 24 January 2008 at 11:54pm
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Markk: How well boxes will array depends mainly on the width of dispersion on the horn and how well it's controlled. You then need to splay the boxes such that between the two, the coverage is constant, ie without a peak or dip where the output of the two sums together. With the 18Sound horns I use, which claim to be 60deg wide, I find an angle of about 45deg between the box fronts gives a constant coverage. Comb filtering is minimised by having horns with a good control of the dispersion and the most attenuation off-axis. This way you are normally listening to either one box or another rather than a mix of the two with different path lengths etc. Midrange isn't so much of an issue because the wavelengths are longer. This can be one of the main reasons for wanting to get the crossover point from cones to compression drivers lower, often below 1kHz on PA boxes. Personally, if I needed more than two or three point source boxes per side I would tend towards using a line array but that's another discussion entirely....! |
Posted By: Strange Daze
Date Posted: 25 January 2008 at 9:32am
The 15s i have lying about are 16ohm......
so i wanted a design with duel 15s, so i can get em down to a usable 8ohm load.
I know this is a pretty old design, and theres better ways of doing it, in ideal circumstances, but im just keeping myself busy by building with what i have to hand. And at the moment, what i have to hand is a load of cheap 15" drivers!.....
.....I like the idea of splitting the cabinet into a dual 15 and a dual 10 + horn...would be slightly more multi functional.....
.....By ''sidefills''......im not neccessarily talking about for a stage aplication. 2 stacks of 1 x DM2 with an 18" reflex underneath would be great for smaller gigs, (very little processing, delaying etc = less set up time),and when used with the full rig, they could even be used as rear stereo stacks....
Most of our music is PsyTrance and or Dub, so the cabinet seems like a good comprimise design wise.....
Also, as im doing this suicide rig project on a budget, driving the 10s and horns will be cheap to buy and power.....and relatively loud.....
mmm.....
cheers for the thoughts guys :)
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ceharden wrote:Posted By: ceharden
Date Posted: 25 January 2008 at 9:35am
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Hmm... 16Ohm drivers eh? Sounds like a job for paralleling them all up and bridging something into them at 4R! Sounds like the twin 15" bass plus twin 10"+Horn would be the most sensible for you. |
Posted By: Strange Daze
Date Posted: 25 January 2008 at 10:05am
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hehe...
you may be right!
......
...got any plans lying round??....(laughs)
I can build, but havent dabbled much in design......
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Posted By: ceharden
Date Posted: 25 January 2008 at 10:19am
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Which drivers do you have exactly? If you can do basic maths and geometry you can design some boxes given some pointers. As a rough guess you'll want between 75-125L per 15" driver depending on how you want to tune it. Most likely 45-50Hz. Probably 20-30L per 10" driver and tune that cab to 70-80Hz. I'd probably make it all as compact as possible. |
Posted By: Strange Daze
Date Posted: 25 January 2008 at 11:36am
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My maths and geometry are fine...(albeit a few years out of practice!!!)
....
Whats the formula for converting cubic centimeters to cubic litres??....
....Think i'll be okay from there....(just dug out my old Eminence design book, and theres design for double 15s in there....that shouldnt need too much modification to incprporate some tens....)
sorry for all the questions!
cheers,
C
ps- Im actually getting quite excited about building some more cabs now.....ITS BEEN YEARS!
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Posted By: Jake_Fielder
Date Posted: 25 January 2008 at 12:10pm
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100,000,000mm3 = 100 litres
EDIT: I'll elaborate....
If i want a box 125litres then that is 125,000,000mm3, divide it by two dimentions of your choice.... say you want the front 600mm wide and 700mm high.. then you het the depth..
125,000,000 / 600mm = 208333.3
208333.3 / 700mm = 297.6
Depth of box 297.6mm
so 600x700x297.6mm = 125 litres
Thats how i do it...
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Posted By: Strange Daze
Date Posted: 25 January 2008 at 12:15pm
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nice.
Thanks Jake.
Cool...
just got some 10s on order thru work, and wood will be bought from BnQ next week....
so i'll keep you all posted :)
THANKS AGAIN!!!
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Posted By: Strange Daze
Date Posted: 25 January 2008 at 12:17pm
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....hehee....
Just enquired about hiring some kit (table saw etc), from HSS.....as my housemate works for em.
Turns out i just have to pay deposit, which i get back when the kits returned!!!
WaHay for housemate who work for HSS!!!
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Posted By: Jake_Fielder
Date Posted: 25 January 2008 at 12:18pm
| How i account for ports and the driver (and bracing if you want to be pedantic!) is, I just add that on at the start so 125litre box + 5 litres (~15"driver) + 1 litre for ports say is 131litres or 131,000,000mm3 then you do the thing i said above |
Posted By: Strange Daze
Date Posted: 25 January 2008 at 12:32pm
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....Im perhaps the least pedantic pro audio salesman and soundsystem owner you'll meet ;)
(*goes to check supplies of Gaffa*).....
Na joking.....
Cheers :)
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Posted By: SmokeyJoe
Date Posted: 20 May 2008 at 12:10am
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If you thought the DM2 was old school...
How about http://www.dancetech.com/aa_dt_new/index.cfm - THESE beasties? The text that describes their performance is quite amusing! - Joe. (ps. these were the boxes I was going to build before finding this site  )
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Posted By: Static Age
Date Posted: 21 May 2008 at 2:42pm
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Joe, that link takes me to the site index, what is it that i'm supposed to see? ------------- 
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Posted By: Strange Daze
Date Posted: 21 May 2008 at 2:46pm
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yea...
was JUST wondering that...
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Posted By: toastyghost
Date Posted: 22 May 2008 at 10:28am
| The site seems to use frames so your address bar never updates with the link to the specific page you're on, probably an innocent mistake. |
Posted By: SmokeyJoe
Date Posted: 22 May 2008 at 11:35pm
http://img167.imageshack.us/my.php?image=fullrange2x15printlb3.gif">
Sorry, toastyghost is right, links are weird with that site! Its an oldschool fane design - looks mean though! - Joe. |