The ultimate midrange driver?

[RussianBlue]

Community Professional M4 compression driver.

Has anyone tried one of these for home use?
Where can I get them and which horn would you use?

4 inch throat, 114 dB SPL 1W/1M -

Cheers

RB

[mazeroth]

Anything under 115 db is wasting your time

[RussianBlue]

Here are the specs. A monster of a driver. I must have them, my pleads have been answered!

I think I will drive it with a 1W Class A amplifier!

[Swedish Chef]

I like the carrying handle!

[phase_accurate]

One thing is very peculiar: They couple the convex side of the diaphragm to the horn throat.
The throat is usually coupled to the other side of the diaphragm for good reasons !

Regards

Charles

[GM]

Hmm, for HIFI use, a ~1.8kHz XO point is not where I want to put one regardless of all the consumer/DIY designs that put one in our most acute hearing BW.

GM

[ScottG]

not quite as much low-end bandwidth but better distortion for a given freq.

http://www.bmspro.com/products/4591.html

[RussianBlue]

Originally posted by ScottG
not quite as much low-end bandwidth but better distortion for a given freq.

http://www.bmspro.com/products/4591.html

I dunno, from glancing at the specs, no comparison I think. The M4 goes down an extra octave and the distortion figures are extremely low. They are given for 10% output and 100%. If I am reading this correctly this means at 20W and 200W program power, not 1W/1M as the BMS product. I draw from this that we got 114dB at 1W, therefore 131 dB at 1M for 20W with less than 1.5% second harmonic (at 1KHz!) and, well MUCH less third harmonic distortion, which would be the evil one here. It looks like less than 2% 3rd harm. distortion at 200W= 137 dB SPL! ..and it goes down to 300 Hz

I gather you would probably need a minimum of 8 high regular pro low midrange direct radiators to come even close to this performance in SPL and their combined distortion figure could not come even close.

******* awesome specs, but the thing could sound like a trashcan. Correct me please if I am wrong.

[454Casull]

Originally posted by RussianBlue



I dunno, from glancing at the specs, no comparison I think. The M4 goes down an extra octave and the distortion figures are extremely low. They are given for 10% output and 100%. If I am reading this correctly this means at 20W and 200W program power, not 1W/1M as the BMS product. I draw from this that we got 114dB at 1W, therefore 131 dB at 1M for 20W with less than 1.5% second harmonic (at 1KHz!) and, well MUCH less third harmonic distortion, which would be the evil one here. It looks like less than 2% 3rd harm. distortion at 200W= 137 dB SPL! ..and it goes down to 300 Hz

I gather you would probably need a minimum of 8 high regular pro low midrange direct radiators to come even close to this performance in SPL and there combined distortion figure could not come even close.

******* awesome specs, but the thing could sound like a trashcan. Correct me please if I am wrong.

The BMS driver has a MUCH smoother response.

[RussianBlue]

Big Gun,

Are you speaking from experience, or are you looking at the charts?

I am having a hard time with these little smoothed charts, I need to get better glasses...

Don't get me wrong though, the BMS stuff looks as if it is VERY affordable!