Help with rear MT122 panel
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=104480
Printed Date: 26 March 2026 at 5:36pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: Help with rear MT122 panel
Posted By: droid017
Subject: Help with rear MT122 panel
Date Posted: 08 November 2019 at 5:23pm
| I'm getting into my first set of MT122s and the plans indicate the rear panel should be removable. How did you accomplish this? |
Replies:
Posted By: cravings
Date Posted: 08 November 2019 at 5:36pm
| It's all on the plan. Removable panel which bolts onto the battens that go round the sides. |
Posted By: droid017
Date Posted: 14 November 2019 at 9:15pm
| I don't see any battens in the plans? Unless you mean the shelves that hold up the wood horns? |
Posted By: DMorison
Date Posted: 14 November 2019 at 9:49pm
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No, that plan doesn't actually show it at all. Look at the plans for X1 etc which do have access panels shown properly - then work out how to implement the same thing on the MT122. The only thing you'll need to be careful of is to make it wide enough to get the 12's in as the back of the cab isn't all that wide. HTH, David.
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Posted By: droid017
Date Posted: 15 November 2019 at 3:27pm
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Thanks DMorison, I can work out how to make the back removeable/mountable, just wasnt sure if there was a preferred way. Does the panel need to be sealed with anything? Is it important to be airtight on these cabs? I've only built subwoofers before, but It doesnt seems like the actual cabinet space is important for sound on the MT.
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Posted By: cravings
Date Posted: 15 November 2019 at 4:22pm
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oops, sorry, my mistake about the battens on the plan. when i built mine, i drew out the plans myself in CAD for how i wanted them and worked off them. the panel should be airtight yes. |
Posted By: Dub Specialist Sound
Date Posted: 16 November 2019 at 2:13am
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Just use some one side sticky gasket foam around the access panel battenings... https://www.bluearan.co.uk/index.php?id=TUFFGAS20&browsemode=manufacturer" rel="nofollow - https://www.bluearan.co.uk/index.php?id=TUFFGAS20&browsemode=manufacturer ------------- Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE... |
Posted By: droid017
Date Posted: 20 November 2019 at 2:18am
| thanks y'all. Have any of you built the MT122 specifically? I have some questions about assembly order. |
Posted By: cravings
Date Posted: 20 November 2019 at 11:33am
i built mt121s. a good few years ago though. must try to find whatever photos i took along the build. |
Posted By: droid017
Date Posted: 20 November 2019 at 7:37pm
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Those look great! Build pics would be super helpful, all of the old threads seem to have dead pics. What order of operations did you follow? I'm thinking of assembling the wood horn separately, then putting the sides/top together with the "shelf" inside, then putting the horn in after that. My concern is that if I'm off by a few mm assembling the cabinet that the horn wont fit right.
With the horn - Do I see that you used a temporary "backplate" at the rear to help assemble it? |
Posted By: cravings
Date Posted: 20 November 2019 at 10:06pm
 sorry i don't seem to have good photos.. it was a good while ago now that i did these. so yeah i think i assembled the whole horn and then fitted it to one side, and fitted the other bits, fitting the other side last. i rebated the side.. don't know that it was neccessary or really gave any advantage though. |
Posted By: cravings
Date Posted: 20 November 2019 at 10:40pm
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found some other photos https://imgur.com/a/07c5jTM" rel="nofollow - https://imgur.com/a/07c5jTM |
Posted By: droid017
Date Posted: 20 November 2019 at 10:50pm
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Dude, those are so helpful! Are those faitalpro horns for the CD? I think I got the same ones, how are you liking them? Any tips on how to measure the cutout for them?
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Posted By: droid017
Date Posted: 20 November 2019 at 10:52pm
| Also, did you calculate the dimensions of the peices for the wood horns? It seems like I have to figure them out myself based on what’s in the drawing, which is tricky. |
Posted By: cravings
Date Posted: 21 November 2019 at 12:03am
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the horns are eighteensound xt1464. yeah cutting the vertical horn flare pieces is an absolute headmelter. i had read people on here saying it was difficult, starting off i couldn't see what would be so difficult, then doing it i got to a point where my brain just froze.. from memory it's about 3.5 degrees. there's a tip for you.. if you're not there yet you'll get there... i haven't used these speakers in years now. and i still feel like building a second pair of them. |
Posted By: cravings
Date Posted: 21 November 2019 at 12:10am
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and for the horn cutout.. i just found an eighteensound plan for a top which had the same horn and used their suggested cutout from that. and just to disclaim it all.. that's just how i built them, not necessarily the best way. i'm sure if you dig deep into the forum (use google search for best results) you'll find other people's build photos too. |
Posted By: 1ManSoundsystem
Date Posted: 15 July 2025 at 2:06am
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maybe a bit late but what is time.... building these MT121 122 is VERY hard and timeconsuming. there is no real plan to do it. build them on one side laying down, build the inner parts first, i guess it diesnt matter. this thing almost has no 90° angles, which makes it so damn hard to do. i remember it took me months to a year to build 4 of them. i just cut to fit. and when i cut off too much, i corrected it with some glued in layers of cardbord. these things are a nightmare. i recommend documenting EVERY step u do on ur first piece, so u can refer to it on the next one. u have countless steps, that will make u insane, figure something out, endure, improvise... it takes time. and be carefull with deadspaces when using t-nuts!!! i had the pleasure while installing the mid-chassis and screwing in a bolt, a t-nut got pressed out in the back right into a dead space. i had to saw a whole in the wall, pick out the t-nut and reseal it. the feeling when sitting next to your almost finished cabinet and have to saw a whole in the sidewall..... just avoid it  use some rampa inserts/threaded inserts or use woodscrews, when working with birch multiplex, u can use the same holes again and again when exchanging chassis. be focused working on the backpanel. when glueing in the rare panel stops, the parts where u put on the raearplate and tighten it with bolts, be as acurate as possible, just 1mm off in to deep or to shallow u will see at the surroundings - the rarepanel will protrude or sink in too much and u have to correct it (sand it down or router)if i would build these again i guess id go for 2x the MT121 bcuz MT122 is REALLY heavy.
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