MT121 Crossover
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=88127
Printed Date: 27 March 2026 at 4:06am
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: MT121 Crossover
Posted By: kr1sounds
Subject: MT121 Crossover
Date Posted: 11 August 2014 at 3:56pm
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ive decided to use mt121 for my mids in a 4 way system. ive decided to cross the speaker and compression driver at 1.6khz (too high?) im going to use an online crossover calculator to find out what components i need. what is the best one to use out of these or does it not matter?  ------------- I MAN SERVE SELASSIE CONTINUALLY... NO MATTER WHAT THE WEAK HEART SAY fostonshfs.webs.com |
Replies:
Posted By: dlyxover
Date Posted: 11 August 2014 at 4:55pm
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Its a bit of a black art the whole passive crossover thing. The higher order slope the more component you, need what makes a bigger, heaver more expensive unit. At a guess 2nd or 3rd order would work but the type of slope is a whole other kettle of fish ------------- Lignum_ww@icloud.com GNKaudio@icloud.com |
Posted By: levyte357-
Date Posted: 11 August 2014 at 5:08pm
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How are you going to handle time aligning the 12" flare/Compression driver ? ------------- Global Depopulation - Alive and Killing. |
Posted By: dlyxover
Date Posted: 11 August 2014 at 5:10pm
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He could have been cleaver when building the cab and took that into account ------------- Lignum_ww@icloud.com GNKaudio@icloud.com |
Posted By: levyte357-
Date Posted: 11 August 2014 at 5:52pm
Or just use an LMS, and do it the "proper" way.  Different drivers in MT121 prefer different xover freqs. ------------- Global Depopulation - Alive and Killing. |
Posted By: kr1sounds
Date Posted: 11 August 2014 at 8:06pm
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I'm building a preamp at the moment too. Should I make it 5 way and run it that way? ------------- I MAN SERVE SELASSIE CONTINUALLY... NO MATTER WHAT THE WEAK HEART SAY fostonshfs.webs.com |
Posted By: mini-mad
Date Posted: 11 August 2014 at 11:46pm
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....use a soundweb and run the sub bass through a guitar distortion peddle and roberts your mothers brother!! ------------- If it sounds like a gorilla is trying to escape, turn it down. |
Posted By: Neilt001
Date Posted: 05 October 2024 at 1:22am
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Hi all, just reviving this. Can anyone advise whether/why the MT 121 needs a x-over? Can't that happen at the amp/processor stage like the MT 122? Sorry if that's a really dumb question. If the MT 121 definitely needs a passive x-over, what has everyone used? Thanks so much!
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Posted By: levyte357-
Date Posted: 07 October 2024 at 3:46pm
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Would personally suggest it's the worse idea in the world, using passive xover with MT121. Either do things properly, with a "decent" LMS, or just build a 2x12" reflex cab, with 1.4" on top.
------------- Global Depopulation - Alive and Killing. |
Posted By: Neilt001
Date Posted: 09 October 2024 at 2:00am
| Ok perfect that's what I was hoping. Thanks! |
Posted By: MarjanM
Date Posted: 09 October 2024 at 8:12pm
10 years ago that would definitely be a dumb idea. But today if you are able to do a FIR correction file for the box, passive crossover can be a brilliant idea. ------------- Marjan Milosevic MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
levyte357- wrote:Posted By: levyte357-
Date Posted: 10 October 2024 at 10:47am
From personal experience, wonderous sound and SPL, even outside at distance, can be obtained, by matching right 12"/2" Comp and flare, in MT121, and then using half decent LMS (Not DCX), to tune delays, xovers, flatten response per section. If drivers are upgraded, no problem adjusting smoothing eq in LMS. Add to that mix, "right amplifiers", on the 12" and the comp, you can cover 5000 ppl, with only 8x MT121s. I'm guessing these days, guys would carry 20x line array tops, to do same thing. Rig owner's choice of course, but was doing the above, with mate's system, for over 10x years. ------------- Global Depopulation - Alive and Killing. |