mt1281
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=67590
Printed Date: 27 March 2026 at 4:06am
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: mt1281
Posted By: Gonzo-4-bidden
Subject: mt1281
Date Posted: 01 June 2012 at 7:41pm
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well its not got a c/d yet but i thought id post some pics of the boxes i just built, it a mt12 with my own 8 inch horn above it, and im going to mount the compression driver at the top of the 12" flare
(feel free to shoot me down and say why its a bad idea )gonna load them with pe32 and 8mi100but in im undecided on the comp and horn yet, ill try upload some pics   ------------- WANTED usb drivers, avc2 |
Replies:
Posted By: Meat
Date Posted: 01 June 2012 at 7:46pm
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Why aren't you just shifting the 8" horn to the side and using the extra space for the 1"? Looks like enough space to fit a small horn like a DE10 or some bullets.
------------- Don't test the champignon sound |
Posted By: Gonzo-4-bidden
Date Posted: 01 June 2012 at 8:06pm
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im a symetry whore to be honest ------------- WANTED usb drivers, avc2 |
Posted By: Gonzo-4-bidden
Date Posted: 01 June 2012 at 8:49pm
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oh yeah, made a tilt/splay board that you can nearly see on top of the usbs in the background
------------- WANTED usb drivers, avc2 |
Posted By: andycw
Date Posted: 01 June 2012 at 10:22pm
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They look wicked! Good job ------------- No Bass No Fun |
Posted By: Timebomb
Date Posted: 02 June 2012 at 2:04am
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Looks good, a small HF horn in the mouth of the 12" section wont affect the 12" much at all, its better to array vertically also so you avoid combing in the horizontal plane around the crossover between the 8" and the 1". ------------- James Secker facebook.com/soundgearuk James@soundgear.co.uk www.soundgear.co.uk |
Posted By: rhuet99
Date Posted: 02 June 2012 at 2:58pm
Very cool boxes.  (symetry whore here as well) The midrange horn is particularly interesting. Have you done a bit of testing on it? I was attempting something similar and roasted hotdogs over the failed prototypes last week. In any case, I will be watching this thread with interest. I have a few 12's begging for new boxes. |
Posted By: Gonzo-4-bidden
Date Posted: 02 June 2012 at 4:28pm
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im afraid i havent been able to do any testing due to lack of funds, its case of hit and hope with this one, im a firm believer that any problems can be ironed out with a bit of eq/crossover twiddling, im only doing this as a hobby to build a little party stack and dont actually intend to make any monies from the rig, just need to order these drivers now and see how it sounds ------------- WANTED usb drivers, avc2 |
Posted By: cravings
Date Posted: 02 June 2012 at 5:53pm
| i really like it. it's a road i'd like to go down with my mt-121s. have considered building the xtro horn in to the top space, but yours has a lot more going on with it. did you do much working out for the 8" horn or are you just jamming with it? |
Posted By: njw
Date Posted: 02 June 2012 at 6:12pm
I like it, its nice to see someone going back to basics a bit and just trying things out for the hell of it rather than looking at countless computer simulations and pages and pages of physics. Anyway, if it sounds as good as it looks it'll be immense.
 |
Gonzo-4-bidden wrote:Posted By: rish
Date Posted: 02 June 2012 at 6:31pm
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+1 njw. Good work Gonzo.you gonna have to play around with delays once up and running but very nice. Rish
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Posted By: Gonzo-4-bidden
Date Posted: 01 October 2012 at 9:21am
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ok so finally ordered some drivers, im using p audio sn12-mb and beyma 8mi-100, could anyond recommend a nice compression driver and horn, not too large so i can mount in front of the 12, cheers ------------- WANTED usb drivers, avc2 |
Posted By: cravings
Date Posted: 01 October 2012 at 10:08am
| faital do some nice small horns. they do a really compact 60/40 horn which may suit. |
Posted By: Gonzo-4-bidden
Date Posted: 01 October 2012 at 1:27pm
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those look faital compression drivers look nice! tad expensive for me tho, havent seen the horns yet, will look when i get home, wonder if thd cd's are cheaper in italy, got a family member going there next month :) ------------- WANTED usb drivers, avc2 |
Posted By: Risc_Terilia
Date Posted: 01 October 2012 at 3:07pm
| Would a 6" not plug the gap better? |
Posted By: Gonzo-4-bidden
Date Posted: 01 October 2012 at 5:11pm
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i only need a compression driver, im not trying to plug the horn mouth of the 12", just mounting the cd+horn there as its the only place that has room for it ------------- WANTED usb drivers, avc2 |
Posted By: rhuet99
Date Posted: 02 October 2012 at 1:38am
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Gonzo Would you be willing to share a plan or drawing of your mid horn and the phase plug? |
Posted By: Risc_Terilia
Date Posted: 02 October 2012 at 9:27am
You misunderstand me. I'm saying would a 6" horn rather than an 8"not be a more natural choice to bridge the gap between the 12" and the comp?
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Posted By: smoore
Date Posted: 02 October 2012 at 9:36am
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Risc_terilia he doesn't misunderstand you. He was asking the OP wether he would share his plans lol.
I would also be very interested in seeing the plans for the 8" if you have any and are willing to share?
As after building myself a pair of mt121s im not so satisfied with the 800-2k region so was thinking of building a 8" horn version also. Any maybe even using a 15" instead of a 12" for the lower mid
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Posted By: cravings
Date Posted: 02 October 2012 at 9:45am
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what high horn / driver do you use? (@ smoore) the 8" section of the xtro is an easy one to pick because it's there, it's straightforward, it fits. having a lot of overlap between the ranges of the 12 and 8" sections could only give you good options for where to crossover etc. |
Posted By: Gonzo-4-bidden
Date Posted: 02 October 2012 at 10:19am
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didnt have a detailed plan, will measure all sides for you but youll have to tear your hair out using a planer like i did to get all the mitres right, remember this wasnt simmed so it might be improvable, and i have basic phase plug knowledge so again im not saying its right, will post measurements when i get some time in the garage but working 7 days at the minute, its a bit late to start thinking about using a 6 inch now as the horns built,plus i think an ideal 6 inch horn mouth and length would look disproportionate to the 12", 8" will be fine ------------- WANTED usb drivers, avc2 |
Posted By: Gonzo-4-bidden
Date Posted: 02 October 2012 at 10:34am
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lol, sorry sounded a bit blunt, was gonna use a fibreglass 6"horn when i started this but never got a good enough finish, for the week it took to make a fibreglass horn, i made these 2 wooden horns in a day, and i chose the 8 over the 6 because i preffered it on paper, both the 12" and 8" (off the top of my head) are 98db1w1m 200 watt drivers so very well suited, (i guess) ------------- WANTED usb drivers, avc2 |
Posted By: Gonzo-4-bidden
Date Posted: 02 October 2012 at 7:21pm
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not gonna link to ebay.de but what do you think of faital pro hf104 ------------- WANTED usb drivers, avc2 |
Posted By: AndyWave
Date Posted: 02 October 2012 at 7:55pm
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By the graphs Faital seems pretty good and has good reputation in my book, not that I have actually listened FH104 on purpose... What about BMS4540ND? Smaller overall diameter (and it should include the thread to flange adapter in package) -A ------------- torturing electrons since ...... |
Posted By: Gonzo-4-bidden
Date Posted: 02 October 2012 at 8:18pm
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corr, i spose its a lot of money but a decent hf is worth every penny, gonna have to find some funds, it would be a shame to let this cab down with a cheap cd, anyone wanna buy a slighty worn kidney or lung? ------------- WANTED usb drivers, avc2 |
Posted By: Gonzo-4-bidden
Date Posted: 02 October 2012 at 8:27pm
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also looking at the rcf line array driver csg used on his mid top, on the "things to do on a sunday thread" only £70 with excellent feedback ------------- WANTED usb drivers, avc2 |
Posted By: smoore
Date Posted: 02 October 2012 at 10:45pm
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@ Gonzo I have what i've been led to believe are fane studio 12l's in my 121s. They have a fane badge on but the rest of the sticker has been removed.
I do really like the sound of them (have never been able to put more than 200w into each of them without them taking my head off). But I am using the cheapest of the cheap piezo motorolo CD's in the top. And as a result of which can't cross them lower than 2.3k.. Which may well be the result of me not liking the 800-2k region! However, I would still like to try a 8" just to make my tops look different and also think it would give me alot more options like you say..
As you suggest, I think I may try the 8" section of the X-tro on top of my 121's. Can anyone suggest an alternative cheaper 8" than the B&C 8pe21?
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Posted By: vmh
Date Posted: 03 October 2012 at 7:34pm
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Very nice cabs. I have been planing something similar using a pair of XT8s i have, but with the 1" on top of the 8'' and possibly with the 12'' separate for more flexibility in stacking.(although they do look nice as one cab) Hoping to start building when we return from the Freek-out next month. Oh! and with 186s underneath.  ------------- It's not how big it is, it's what you do with it! |
Posted By: Gonzo-4-bidden
Date Posted: 06 December 2012 at 1:39pm
few more pics, all ready for paint now
 ------------- WANTED usb drivers, avc2 |
Posted By: cravings
Date Posted: 06 December 2012 at 3:14pm
| wow they look great. |
Posted By: rhuet99
Date Posted: 06 December 2012 at 4:32pm
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Those are sweet. Great job. |
Posted By: infrasound
Date Posted: 06 December 2012 at 4:39pm
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Nice!! Why the APT though?
 |
Posted By: pfly
Date Posted: 06 December 2012 at 4:48pm
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If I believe what my ears tell me and what Eminence and JBL spec sheets tell me, APT80 has quite similar sensitivity and frequency response between 10-20khz as does JBL 2445J/2380 combo. APT really isn't much of a supertweeter. Other than that, nice box! |
Posted By: Gonzo-4-bidden
Date Posted: 06 December 2012 at 5:18pm
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just sttled on the emminence as it does the frequencies i need and its small and cheap, dont think ive heard one but its changable if its that bad, proof is in the pudding i spose, flippers crossed ------------- WANTED usb drivers, avc2 |
Posted By: pfly
Date Posted: 06 December 2012 at 9:50pm
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JBL 2445J / 2380A -combo is an old large-ish 2" driver & horn combo that does not really make much noise in the highest octave (around 10 to 20khz) and is quite well known for that. I was looking for a super tweeter for a friend to go on top of 2445J / 2380A. He was going to get few APT80s but when I started inspecting and based on those APTs I've heard, I came to conclusion it really does not fit the application. They also seem to have quite distorted character. See for yourself. One of these published graphs represents large mid range compression driver that wasn't exactly designed to do upper spectrum while other is marketed as a super tweeter.  Now if it works for you and you're happy, by all means, go on with that. |
Posted By: bitSmasher
Date Posted: 06 December 2012 at 10:51pm
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Woah yeah, nice! How do they sound, got any measurements? |
Posted By: Gonzo-4-bidden
Date Posted: 06 December 2012 at 11:00pm
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pfly your forgetting my point of this build, im not going for high end compete with the bigboys in clubs route with this, its a hobby i enjoy and only intend to entertain a few friends in the process, if it makes noise ill be happy, if the top end turns out to not sound how i want its an easy fix, @ bitsmasher, havent tested them yet, gonna paint soon then have a play around, will post back soon ------------- WANTED usb drivers, avc2 |
Posted By: pfly
Date Posted: 06 December 2012 at 11:17pm
It is easy to fix, true  I just have grown to dislike the APT personally. You could use something like BMS 4524 combined to Faital STH100 or Eighteensound XT120 in there and be really happy. IF the APT starts to bother you, then you could try something like that. Not too expensive. |
Posted By: Wrek0ne
Date Posted: 07 December 2012 at 1:35pm
I have some XT120's if your interested. Very nice looking boxes though  ------------- Poll this! |
Posted By: burningbush
Date Posted: 07 December 2012 at 2:33pm
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Those APT graphs are a not funny joke, super tweeter my #arse. ------------- music is the message |
Posted By: njw
Date Posted: 08 December 2012 at 8:08pm
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I think you just tend to notice the 'sparkle' more with APTs as they haven't got any real upper midrange output like a large compression driver, I run some Fane 1"ers above some Cerwin Vega 2"ers and find they need huge (almost silly) amounts of EQ to bring the sparkle out.
What were those silly cheap bullets on fleabay everyone was harking on about?
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Posted By: pfly
Date Posted: 09 December 2012 at 1:32am
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Not all 1" drivers are born equal, few decades ago also many 1" drivers pretty much required some sort of supertweeter. Is that 1" Fane mounted on CD horn? If so then it is just the nature of that horn and really needs a shelf EQ to make top end "sparkle" |
Posted By: njw
Date Posted: 09 December 2012 at 3:47pm
| I think you've hit the nail on the head there, I wasn't sure if the horn was CD or not but it must be as I've had to add quite a large shelf to it to bring out the sparkle. |
Posted By: Gonzo-4-bidden
Date Posted: 13 April 2013 at 11:42am
ok, so ive loaded and painted these now and just been having a little play in the bedroom, i have the 12"playing from 170 hz to 900hz and the 8"playing from about 870hz to 3.5khz and the APT playing from 3khz to 20 khz, i have set the delays and got the cabs time aligned but have no idea of phase alignment as i have no tools to test them but thats for another thread... my only concern is the although the 8" is doing its job taking stress of difficult frequencies from the 12" and 1" upon soloing the 8" it just seems im wasting the potential of such a nice sounding driver, as the frequencies it plays are so high theres just no oomph? it sounds very clear but obviousely no depth, still havent heard these with any bins yet tho so maybe thats when all will fall into place, ------------- WANTED usb drivers, avc2 |
Posted By: elliotH92
Date Posted: 09 May 2014 at 9:35pm
| Any updates on these? Tried them in a stack yet? Building some labs n usbs soon, and just been scouting about for a suitable top to go above them |
Posted By: Gonzo-4-bidden
Date Posted: 11 May 2014 at 10:57am
only have two of these atm but more than happy with them, i have just changed the tweeters as the apt's needed too much power to keep up, movin house this month so im gonna try build a couple more when in the new place, i did promise someone on here the dimensions and rough plan for the 8" horn, but ive been slack as  lately, we use these above 6 usbs and it humms!!! do want labs or similar tho------------- WANTED usb drivers, avc2 |
Posted By: cravings
Date Posted: 11 May 2014 at 1:33pm
| i'd love to see some of your working out for the mid horn alright. |
Posted By: Gonzo-4-bidden
Date Posted: 12 May 2014 at 5:12pm
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lol, was merely hit and hope for the horn cravings, just started cutting and glueing, would be good to see if someone could sim thse ------------- WANTED usb drivers, avc2 |
Posted By: Gonzo-4-bidden
Date Posted: 12 December 2015 at 12:16pm
latest pic of the tops, ditched the apt tweeters pretty quickly, well happy with these now, just gotta try and make another 2
------------- WANTED usb drivers, avc2 |
Posted By: Gonzo-4-bidden
Date Posted: 12 December 2015 at 12:20pm
image fail...... 
------------- WANTED usb drivers, avc2 |
Posted By: Gonzo-4-bidden
Date Posted: 12 December 2015 at 12:47pm
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just noticed all the build pics have gone, will dig them out and repost ------------- WANTED usb drivers, avc2 |
Posted By: njw
Date Posted: 12 December 2015 at 9:10pm
| What tweeters are you now running out of interest? |