[BMS 4550 + 2230 horn] + 2xB&C12PE32
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=44338
Printed Date: 26 March 2026 at 8:43pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: [BMS 4550 + 2230 horn] + 2xB&C12PE32
Posted By: dOpeShack
Subject: [BMS 4550 + 2230 horn] + 2xB&C12PE32
Date Posted: 20 October 2010 at 8:48am
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What do people think about a BMS 4550 compression driver with a BMS 2230 horn, with a crossover point at 900Hz, on top of two half MT 122 loaded with B&C12PE32? (I mean to build the MT 122 in three different cabinets, 2x12" + the top section)
Sounds like a good mid/top setup doesnt it?  ------------- King HiFi - Heavyweight Dancehall System |
Replies:
Posted By: Tony Wilkes
Date Posted: 20 October 2010 at 9:31am
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Not sure about running the 2230 horn as low as 900, 1200 is as low as I take mine. I know that the RCF (HF64 & HF94) is more expensive but IMHO it would be a better choice. Tony ------------- www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE) |
Posted By: dOpeShack
Date Posted: 20 October 2010 at 9:45am
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Thanks for feedback tony, specs say cutoff frequency 900Hz.. http://bmsspeakers.com/fileadmin/bms-data/product_data/horns/bms_2119_t.data.pdf - http://bmsspeakers.com/fileadmin/bms-data/product_data/horns/bms_2119_t.data.pdf Plus i thought using BMS horn on BMS compression driver would be a good idea... ------------- King HiFi - Heavyweight Dancehall System |
Posted By: Tony Wilkes
Date Posted: 20 October 2010 at 9:51am
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A horn still has to provide loading below the X-over frequency. By using a 48db/oct filter you could run pretty close to the horn cut-off but not that close. I like the 2119 horn but it is not suitable for crossing that low. ------------- www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE) |
Posted By: silworm
Date Posted: 20 October 2010 at 11:01am
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Besides the RCF what would other alternatives be for the horn for loading at the required frequency? I'm doing the same project, still deciding on components would be most interested in a horn with 60 or 40 deg horizontal dispersion so I can array 3 in one stack. |
Posted By: dOpeShack
Date Posted: 20 October 2010 at 1:34pm
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After a quick search it seems very hard to find horns that cutoff low enough... It dont love the look of the RCF, but i think I'll stick to that!
------------- King HiFi - Heavyweight Dancehall System |
Posted By: silworm
Date Posted: 20 October 2010 at 2:54pm
| dOpe Shack, were will you get the RCF from? |
Posted By: dOpeShack
Date Posted: 20 October 2010 at 3:34pm
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Very good question... only found a swedish site.. Anyone? ------------- King HiFi - Heavyweight Dancehall System |
Posted By: silworm
Date Posted: 20 October 2010 at 4:05pm
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Found this from France so should be good for you http://www.toutlehautparleur.com/pavillons/rcf-hf64-p-741.html - http://www.toutlehautparleur.com/pavillons/rcf-hf64-p-741.html |
Posted By: dOpeShack
Date Posted: 21 October 2010 at 12:42pm
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Thanks silworm! H64 = 60° x 40° H94 = 90° x 40° What does the size of the throat affect? In what situatione you'd better use a 60x40 compared to a 90x40? On top of two 12" loaded in a MT 122 style cab, with 4 scoops underneath, which would be the best option? ------------- King HiFi - Heavyweight Dancehall System |
Posted By: Tony Wilkes
Date Posted: 21 October 2010 at 1:30pm
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If you are going to use just one MT or one per side then probably the 90, 60 is still pretty wide and would suit a lot of venues.
------------- www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE) |
Posted By: dj infinite
Date Posted: 23 October 2010 at 12:53pm
| i have the same kind of problem at the moment deciding on a 1" horn for mt121. i did use the Celestion H1-9040P (90x40) in my X10's but crossed at 2k & in groups of 2 they were fine but im unsure if in groups of 2 mt121 crossed at 1K with the same horn will be ok? |
Posted By: Tony Wilkes
Date Posted: 23 October 2010 at 1:02pm
Although the 9040p is rated as 90d horiz because of its profile it narrows considerably as frequency rises. Try arraying them with the two boxes you have and see if lobing is an issue. Tony ------------- www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE) |
dj infinite wrote:Posted By: MarjanM
Date Posted: 23 October 2010 at 1:03pm
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I can find those horns for about 60eur. Not sure what the shipment will cost you. ------------- Marjan Milosevic MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
Posted By: MarjanM
Date Posted: 23 October 2010 at 1:04pm
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Also can find a fiberglass copy of that horn for half of that.
------------- Marjan Milosevic MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
Posted By: dOpeShack
Date Posted: 25 October 2010 at 12:09pm
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TONY, in another post i read you say :"4550 will work down to 800hz BUT only with one horn loaded 12" I would not use them with 2. Change to about 1.2 K if used with 2 Horned 12" ers." Can you explain why please? ------------- King HiFi - Heavyweight Dancehall System |
Posted By: Tony Wilkes
Date Posted: 25 October 2010 at 12:42pm
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Because of the output required I do not see the 4550 being able to keep up with the twin 12" drivers if crossed at 800hz. You will probably get away with it regards not blowing the driver but no comp sounds that good when being played balls-out. Even at 1.2K it will be pushed. If I run MT212's I have to admit that I would stick a 4590 (or 4592nd) on tops and allow this to do 750hz +, a lot more expensive though. ------------- www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE) |
Posted By: dOpeShack
Date Posted: 25 October 2010 at 1:03pm
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What about a stack with two 12" in MT121 and two 4550 with RCF H94 then? ------------- King HiFi - Heavyweight Dancehall System |
Posted By: Tony Wilkes
Date Posted: 25 October 2010 at 2:00pm
No problems at all if you do that, a bit more flexible as well, it also becomes a one man lift. Tony ------------- www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE) |
Posted By: dOpeShack
Date Posted: 25 October 2010 at 2:41pm
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Perfect i'll go with that with a 900Hz crossover like we discussed. Thansk for your advises Tony! ------------- King HiFi - Heavyweight Dancehall System |
Posted By: kevinmcdonough
Date Posted: 25 October 2010 at 3:43pm
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hey for those who were looking for the RCF horns, things have just changed in the UK. Audio workshop were the component sales and service centre for RCF in the UK, when i contacted RCF in the past they put me on to them and i got 4 HF64's from them (also to run on BMS 4550's.) Soldily built, nice thick aluminium and the cabs should be up and running end of this week barring no big work things coming up and taking my time away, looking forward very much to hearing the combination. However with the passing of the audio workshop founder, i just read in L&Si that the contract has now went to Ampman Audio, so I assume sales for drivers and components will also have moved there. http://www.rcfaudio.co.uk/news.php?subaction=showfull&id=1286199825&archive=&start_from=&ucat=& - http://www.rcfaudio.co.uk/news.php?subaction=showfull&id=1286199825&archive=&start_from=&ucat=& k |
Posted By: Steve_B
Date Posted: 25 October 2010 at 3:48pm
The plots below show the measurements on and off axis of a horn I have made. I have not actually seen the bms horn but judging from the photos mine is quite close. See photo lower down. The drive unit is a paudio bmd 750. As you go down the angles are, 0, 10, 20, 30, 35, 40, 45. The divisions are 3dB and traditionally the quoted directivity is at the -6dB point. Don't forget my measurements are for one side so the 45 degree represents a 90 dispersion pattern. As a comparison this is my round horn with the bms 4524. The highpass filter was set at 500Hz in both cases  The 10 degree plot obscures the 0 degree plot except for at high frequencies. The netx plot down is at 20 degrees then 25, 30, 35, 40, 45.  |
Posted By: AndyWave
Date Posted: 28 October 2010 at 6:40am
Hi Marjan Who sells  fiberglass version?-Andy ------------- torturing electrons since ...... |
Posted By: dOpeShack
Date Posted: 17 November 2010 at 8:34am
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TONY, I read you say in another thread "If you do not mind exponential then look no further than the Celestion H1-9040P great value horn that works well with BMS 4544 & 4550, Just make sure the comp has a brace to support the weight. This horn loads to as least 800hz ( yes I have done the measurements)" Why not make this choice then, it's way cheaper than the RCF! I could use two 4550 loaded ont top of my two 12", with 900hz crossover? ------------- King HiFi - Heavyweight Dancehall System |