Speakerplans.com Homepage
Forum Home Forum Home > Plans > MT122
  New Posts New Posts RSS Feed - [BMS 4550 + 2230 horn] + 2xB&C12PE32
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

[BMS 4550 + 2230 horn] + 2xB&C12PE32
 Post Reply Post Reply Page  <12
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
Tony Wilkes View Drop Down
Old Croc
Old Croc
Avatar

Joined: 02 August 2004
Location: West Midlands
Status: Offline
Points: 4835 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony Wilkes Quote  Post ReplyReply Direct Link To This Post Posted: 23 October 2010 at 1:02pm
Originally posted by dj infinite dj infinite wrote:

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?


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)
Back to Top
MarjanM View Drop Down
Old Croc
Old Croc
Avatar

Joined: 10 February 2005
Location: Macedonia
Status: Offline
Points: 7845 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 23 October 2010 at 1:03pm
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
Back to Top
MarjanM View Drop Down
Old Croc
Old Croc
Avatar

Joined: 10 February 2005
Location: Macedonia
Status: Offline
Points: 7845 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 23 October 2010 at 1:04pm
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
Back to Top
dOpeShack View Drop Down
Registered User
Registered User
Avatar

Joined: 18 August 2010
Location: France
Status: Offline
Points: 70 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dOpeShack Quote  Post ReplyReply Direct Link To This Post Posted: 25 October 2010 at 12:09pm
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
Back to Top
Tony Wilkes View Drop Down
Old Croc
Old Croc
Avatar

Joined: 02 August 2004
Location: West Midlands
Status: Offline
Points: 4835 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony Wilkes Quote  Post ReplyReply Direct Link To This Post Posted: 25 October 2010 at 12:42pm
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)
Back to Top
dOpeShack View Drop Down
Registered User
Registered User
Avatar

Joined: 18 August 2010
Location: France
Status: Offline
Points: 70 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dOpeShack Quote  Post ReplyReply Direct Link To This Post Posted: 25 October 2010 at 1:03pm
What about a stack with two 12" in MT121 and two 4550 with RCF H94 then?
King HiFi - Heavyweight Dancehall System
Back to Top
Tony Wilkes View Drop Down
Old Croc
Old Croc
Avatar

Joined: 02 August 2004
Location: West Midlands
Status: Offline
Points: 4835 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony Wilkes Quote  Post ReplyReply Direct Link To This Post Posted: 25 October 2010 at 2:00pm
Originally posted by dOpeShack dOpeShack wrote:

What about a stack with two 12" in MT121 and two 4550 with RCF H94 then?


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)
Back to Top
dOpeShack View Drop Down
Registered User
Registered User
Avatar

Joined: 18 August 2010
Location: France
Status: Offline
Points: 70 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dOpeShack Quote  Post ReplyReply Direct Link To This Post Posted: 25 October 2010 at 2:41pm
Perfect i'll go with that with a 900Hz crossover like we discussed.

Thansk for your advises Tony!
King HiFi - Heavyweight Dancehall System
Back to Top
kevinmcdonough View Drop Down
Old Croc
Old Croc
Avatar

Joined: 27 June 2005
Location: Glasgow
Status: Offline
Points: 3756 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kevinmcdonough Quote  Post ReplyReply Direct Link To This Post Posted: 25 October 2010 at 3:43pm
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=&

k


Edited by kevinmcdonough - 25 October 2010 at 3:47pm
Back to Top
Steve_B View Drop Down
Old Croc
Old Croc


Joined: 29 September 2007
Status: Offline
Points: 1592 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve_B Quote  Post ReplyReply Direct Link To This Post 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.
Back to Top
AndyWave View Drop Down
Registered User
Registered User
Avatar

Joined: 30 March 2008
Location: Finland
Status: Offline
Points: 381 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AndyWave Quote  Post ReplyReply Direct Link To This Post Posted: 28 October 2010 at 6:40am
Originally posted by MarjanM MarjanM wrote:

Also can find a fiberglass copy of that horn for half of that.


Hi Marjan

Who sells plasticPinch fiberglass version?

-Andy


Edited by AndyWave - 28 October 2010 at 8:06pm
torturing electrons since ......
Back to Top
dOpeShack View Drop Down
Registered User
Registered User
Avatar

Joined: 18 August 2010
Location: France
Status: Offline
Points: 70 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dOpeShack Quote  Post ReplyReply Direct Link To This Post Posted: 17 November 2010 at 8:34am
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
Back to Top
 Post Reply Post Reply Page  <12

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.08
Copyright ©2001-2026 Web Wiz Ltd.