Any comments on the BMS 4538 compression driver?

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#21
weltersys said:
Midrange reduction won't change the low output potential which is limited by excursion, not power. The level in the 1200 Hz range is 117 dB,(read the 2 dB graph increments wrong) the level above is more. I don't get what your 109 dB reference is.

The top octave response is from 15,000 to 30,000 Hz, I can look at it but can't hear it ;^).
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The treble response is down around 9db from the midrange peak and the response at 1200 is down from the peak so to fix it the peak needs padded. I wouldn't use this below 2k myself - If it's in a slower rate horn maybe it'll be ok
 
#22
weltersys said:
What makes you think that the BMS 4538 will have "better SQ" than the driver that Tannoy used ?

I do not know but the driver is cheap enough for me to try 🙂 I have not fired up the Tannoys yet but have been told that the tweeter compression driver is its weak side.

Do you have EQ in your active crossover to compensate for the different driver response?
Do you have delay in your active crossover to compensate for the different driver depth/phase response?

Yes, I have a MiniDSP 4hd10. What I cannot make up for is potential different exit angles on the Tannoy tweeter and the BMS.
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#24
Audiodidakt said:
Hi Pooh

What would be your choice, save for very expensive drivers as TADs etc.?
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Hello, in what horn with what bass driver and crossover for what application? I like the Celestions for modern inexpensive 1" drivers but only when used correctly.

The Tannoy compression drivers are excellent in the dual concentrics. I wouldn't mess with trying to improve them other than tweaking the crossover to your liking.
 
#25
POOH said:
Hello, in what horn with what bass driver and crossover for what application? I like the Celestions for modern inexpensive 1" drivers but only when used correctly.

The Tannoy compression drivers are excellent in the dual concentrics. I wouldn't mess with trying to improve them other than tweaking the crossover to your liking.
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Ok, I will fire it up a have a listen (and possibly tweak).

As bassdrivers I have available AE td15m, td18h+ and dipole12s, plus Precision Device pd2450. Have not decided upon driver choice yet.
 
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