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Old 14th June 2010, 02:16 PM   #1
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Default Compression driver for Eminence Beta 12CX

Hi guys, can anyone recommend a good compression driver for an Eminence Beta 12CX other than the selenium DT220i? Would like to crossover at 900hz and active eq like the emerald physics CS2.3

Have heard mixed things about this driver but its cheap enough to give it a try i think. Please share your experience if you have had success with it.
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Old 14th June 2010, 03:27 PM   #2
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I really don't think any compression driver is going to do well at 900Hz on a 12" coax. You should look to a higher crossover point. The 12" "waveguide" is not big enough for a crossover point that low. IMO.

FWIW, I heard a pair DT220i crossed at 1200Hz yesterday and they sounded rather nice. They were on Altec 811B horns.
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Old 14th June 2010, 10:04 PM   #3
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Compression driver /horn < 1000hz - ?cheap 1.4"?
Is it a 1" CD? Why don't you look here just for some information.
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Old 15th June 2010, 02:24 AM   #4
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Originally Posted by panomaniac View Post
I really don't think any compression driver is going to do well at 900Hz on a 12" coax. You should look to a higher crossover point. The 12" "waveguide" is not big enough for a crossover point that low. IMO.

FWIW, I heard a pair DT220i crossed at 1200Hz yesterday and they sounded rather nice. They were on Altec 811B horns.
Yes 900hz is very low. How this works so well on the CS2.3 (with a 3rd order passive x-over) is beyond me. I may just try it at 1200hz instead, hopefully wont have excessive beaming from the mid woofer.

Quote:
Is it a 1" CD? Why don't you look here just for some information.
Thanks for the link. I believe the Beta 12CX takes 1" only but im not 100% certain.
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Old 15th June 2010, 02:57 AM   #5
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You might also look at the CDX1-1731 from Celestion. Nice sounding driver, don't know if you can get it at a reasonable price down under.
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Old 15th June 2010, 02:02 PM   #6
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Originally Posted by panomaniac View Post
You might also look at the CDX1-1731 from Celestion. Nice sounding driver, don't know if you can get it at a reasonable price down under.
Is there a 1731? I have the 1745 (QSC HPR-152i speakers uses it).

Its only $70 from QSC parts online. Its not a bad CD at all. I think its superior to my D220 screw on CD.
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Old 15th June 2010, 02:59 PM   #7
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The 1731 is the screw on with Neo magnet. New, I think. Good sounding driver.
The 1745 is a ferrite bolt-on. I've not heard it.
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Old 15th June 2010, 03:11 PM   #8
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Check out Radian 850PB.
I am not sure if it will mount onto the eminence woofer though.

Radian - 850PB
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Old 15th June 2010, 06:16 PM   #9
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Originally Posted by panomaniac View Post
The 1731 is the screw on with Neo magnet. New, I think. Good sounding driver.
The 1745 is a ferrite bolt-on. I've not heard it.
Thanks and good to know.
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Old 15th June 2010, 06:39 PM   #10
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I'm also building an E.P. CS2.3 clone.

I use a BMS 4552Nd and a adapter to fit it on the coax driver. The 4552 can go as low as 500 Hz.

I've used the BMS4552Nd as low as 750 Hz with a 8. order software based crossover filter (XOVER) in Foobar mediaplayer and it sound absolutely outstanding! I've used Radian PB950 in the past and the BMS driver is in the same league IME.

For the CS2.3 clone/variant I'll use a 2. order passive filter @ 900 Hz for the BMS and coax driver. And 2. order active filter at 100-150 Hz. The active filter is a variant of the Firstwatt B4 based on the B1 circuit design.

Good luck!
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