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Old 29th June 2009, 02:55 PM   #1
fb is offline fb  Australia
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Default Compression driver /horn < 1000hz - ?cheap 1.4"?

I'm hoping to find a compression driver and horn to match to a 15" woofer (TD15M), so crossover <=1000hz. It needs to sound excellent in my home at low levels, and be able to cop it in PA use.


I can get the 18Sound waveguides cheaply, so they are a good option.

Does anyone know of a cheap 1.4" driver to match with an XT1464?

Has anyone used the 18Sound ND1424BT? This has the advantage of being designed for that waveguide.


Another option might be the Radian 745PB
+ Flat freq response on manufacturer's graph.
- No idea about mating with XT1464.
- No reviews to be found.

Unfortunately, price is a factor, so I can't afford the 18Sound NSD drivers, nor the Geddes' 15" waveguide.


I want the extra efficiency and extension of the 15", but if I can't find a suitable HF it'll be TD12M + BMS 4552ND + XT1086





Ta
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Old 29th June 2009, 07:42 PM   #2
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Beyma SMSC65Nd must be what you are looking for
http://www.supersonic.se/links/SMC65ND.pdf

you can use it with the TD-565 horn
http://www.usspeaker.com/beyma%20TD-565-1.htm

Frequency range: ~0.450 - 20kHz (coupled to TD-565 horn)
Rec. xover: 0.8kHz (12dB/oct. min.)
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Old 29th June 2009, 09:45 PM   #3
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When you said cheap, I thought you meant really cheap! But I guess non of the 1.4" drivers some super cheap.

I run an old Radian that is equiv. to the 745, but it doesn't go nearly as high. Not a bad driver, the 745 gets used in big hi-fi, AFAIK.

You might also look at the Beyma CP755. I've heard good things about it, tho have not heard it in the flesh.
http://profesional.beyma.com/ingles/pdf/CP755NdAL.pdf

Another I have heard is the P.Audio 1.4". Nice driver. Don't remember the number.
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Old 29th June 2009, 10:31 PM   #4
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Why a 1.4" for such a high XO point? 1" is more appropriate and cheaper.

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Old 29th June 2009, 11:03 PM   #5
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Good thought GM. More choices, too. On the other hand, I've heard a lot of bad 15+1" PA boxes....
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Old 30th June 2009, 12:19 AM   #6
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The main thing is the horn has to be big enough, which is one of the places where manufacturers cut corners these days to save a few $$$.

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Old 30th June 2009, 01:44 AM   #7
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Quote:
Originally posted by panomaniac
When you said cheap, I thought you meant really cheap! But I guess non of the 1.4" drivers some super cheap.

I run an old Radian that is equiv. to the 745, but it doesn't go nearly as high. Not a bad driver, the 745 gets used in big hi-fi, AFAIK.

You might also look at the Beyma CP755. I've heard good things about it, tho have not heard it in the flesh.
http://profesional.beyma.com/ingles/pdf/CP755NdAL.pdf

Another I have heard is the P.Audio 1.4". Nice driver. Don't remember the number.
CP755/Ti looks better than NdAL and better for the price. It comes clean from ~0.5 - 20kHz.
BEYMA CP755/Ti - 1.4" PRO HF DRIVER
http://profesional.beyma.com/ingles/pdf/CP755Ti.pdf
http://www.usspeaker.com/beyma%20CP755Ti-1.htm
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Old 30th June 2009, 01:46 AM   #8
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Thanks for all the suggestions, I'll have a look into it.


For 1" drivers, it's tough to find a combo that'll get to 1000hz. The BMS4552ND + XT1086 will just get there, but I don't think it would be ideal - no idea though: http://lscon.tripod.com/xt1086/SPL.jpg


There's also a FaitalPro waveguide: http://www.faitalpro.com/products/sc...p?id=903010110


I'm looking for a low-diffraction waveguide
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Old 30th June 2009, 03:38 AM   #9
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Default Re: Compression driver /horn < 1000hz - ?cheap 1.4"?

Quote:
Originally posted by fb
I'm hoping to find a compression driver and horn to match to a 15" woofer (TD15M), so crossover <=1000hz. It needs to sound excellent in my home at low levels, and be able to cop it in PA use.
...
Try a 1.st Order for the CD (not w/for too much power) with a 22ohm resistor (Att.11dB) and a 2,2uF cap (~2kHz)/Adjust. 1.st Order also for TD15M, maybe. It's just an idea, use 2.nd/3.rd Order on CD if the xover is lower than or you need full power. That should be very close.
See (woofer) it's response here
http://www.avsforum.com/avs-vb/showp...81&postcount=9
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Old 30th June 2009, 04:51 AM   #10
GM is offline GM  United States
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I thought this was a DIY forum.

Various ways to make what you need:

http://www.steinmusic.de/horn/artikelee.html
http://vincent.brient.free.fr/round_horns.htm
http://www.volvotreter.de/pics_plans.htm
http://web.archive.org/web/200306220...wsn/page2.html

GM
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