Coaxial MT122
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=47388
Printed Date: 26 March 2026 at 10:56pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: Coaxial MT122
Posted By: AM55
Subject: Coaxial MT122
Date Posted: 16 January 2011 at 3:25pm
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Not sure if this has been covered before but is the any reason why you cant cut down and mt122 (as per pic below) and mount the HF in the top 12" horn. Anything to take into consideration when moutning the HF? Any effect on sound?  ------------- https://diy-disco.co" rel="nofollow - Audio Visual Equipment Hire Service |
Replies:
Posted By: djeddie
Date Posted: 16 January 2011 at 4:15pm
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Try this one, but try a search as I know it's come up a few times over the last few years :- http://forum.speakerplans.com/horn-loading-a-coax-driver_topic47168.html - http://forum.speakerplans.com/horn-loading-a-coax-driver_topic47168.html ------------- Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB |
Posted By: MarjanM
Date Posted: 16 January 2011 at 4:25pm
That is a complete misguide man. Entirely different topic for different thing. ------------- Marjan Milosevic MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
djeddie wrote:Posted By: MarjanM
Date Posted: 16 January 2011 at 4:29pm
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AMSS, coaxial loading will mess up the mid driver dispersion a bit, but that does not stop D&B to make C4 and C7 tops that do sound fabulous. ------------- Marjan Milosevic MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
Posted By: AM55
Date Posted: 16 January 2011 at 4:29pm
I don't mean using a coaxial speaker like in that thread I mean actually mounting the HF driver and flare in the top horn space, bit like the BFM omnitops. ------------- https://diy-disco.co" rel="nofollow - Audio Visual Equipment Hire Service |
Posted By: Timebomb
Date Posted: 16 January 2011 at 5:37pm
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I tryed it with quite a big horn about 300 x 150 and it didnt really affect the responce untill about 800Hz on axis, nearfield imageing was better, id say its a good idea. Id go for a 60 x 40 horn to roughly match dispertion at 800Hz and cross to a BMS 4550 at 800Hz or a nice 2".
------------- James Secker facebook.com/soundgearuk James@soundgear.co.uk www.soundgear.co.uk |
Posted By: Timebomb
Date Posted: 16 January 2011 at 5:38pm
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That was in single 12" horns though, but i think it would still work well with a twin 12".
------------- James Secker facebook.com/soundgearuk James@soundgear.co.uk www.soundgear.co.uk |
Posted By: cravings
Date Posted: 16 January 2011 at 5:41pm
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i think.. i've grasped.. that if your (high) horn is small enough to not interfere with the wavelengths of the frequencies of signal the mid horn is producing.. it'll be fine.. like in the Xtro plan, or something.. maybe look stuff like that up.. |
Posted By: AM55
Date Posted: 16 January 2011 at 7:03pm
I would go with a 60 x 40 horn not sure about a 1" compression driver though. ------------- https://diy-disco.co" rel="nofollow - Audio Visual Equipment Hire Service |
Posted By: sonofalesbian
Date Posted: 16 January 2011 at 7:06pm
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xtro is abit different though, because the comp is in the horn path of a 15" driver that doesnt anywhere near touch 800 hz, so not much chance of interfearence there! ------------- www.brotherhoodsoundsystem.co.uk |
Posted By: Timebomb
Date Posted: 16 January 2011 at 9:13pm
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What ever horn you use it will cause some interfearence, the HF horn will always be bigger than 1/4 wavelength at the crossover frequency, its not going to be accousticly invisable The question is how dos it sound in the real world, the only sure way to find out is to try. As long as the horn is well designed to meet 800Hz i think it will work well, as i tryed quite a large horn in the mouth of a MT112 with a BMS 4544 and it worked well. ------------- James Secker facebook.com/soundgearuk James@soundgear.co.uk www.soundgear.co.uk |
Posted By: Timebomb
Date Posted: 16 January 2011 at 9:18pm
Id recomend you give the 4550 a try, ive not got that one but the 4544 sounds great crossed at 1.3KHz and the 4550 recomends crossing even lower. I was a bit skeptical about running a 1" that low but it works ------------- James Secker facebook.com/soundgearuk James@soundgear.co.uk www.soundgear.co.uk |
Posted By: AndyWave
Date Posted: 19 January 2011 at 4:11pm
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JBL whitepaper about PD700-series cover this subject (how big top end can be nested in MB-horn) very well. http://www.jblpro.com/catalog/support/getfile.aspx?docid=270&doctype=3 Andy ------------- torturing electrons since ...... |
Posted By: AM55
Date Posted: 19 January 2011 at 5:15pm
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Thanks for that Andy it is an interesting read. Seems like there are things that would be hard to overcome like reflections off the back of the HF driver and interference with expansion of mid horn, at least with my knowledge.
------------- https://diy-disco.co" rel="nofollow - Audio Visual Equipment Hire Service |