GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Compression Drivers -in general

Post Subject: Compression Drivers -in generalPosted by serenechaos on: 10/19/2008

-Background-
Enspired by Jeffery Jacksons system as displayed @ VSAC, I'm building a five-way horn system.
Tapped horn for up to ~80Hz; w/ Eminence driver
65Hz Tractrix from ~80Hz to ~400Hz w/ fane 8";
250Hz LeCleach from ~400Hz to ~2kHz;
Oblate Spheroid to match 2kHz crossover point, to 10kHz;
JBL 2405 ribbon from 10kHz up.
After many questions and much advice from Jeffery, as well as John Hasquin on Horn building, I think I'm well on the way with that part.

I have a pair of Radian 850PBs and 475PBs to use at first, but would like to build compression drivers matched to the 400 - 2K and 2K - 10K frequency ranges.
I've not had much luck in finding information on how to size...
1) Magnet sturcture, material, strength, permanet or fieldcoil.
2) Phase plug configuration-- dome size, shape, rings, or "tangerine" openings.
3) Diaphram material, surround material
4) Compression ratio
5) How all these, and everything else affect Sound.

Any suggestions, directions on where to find literature, etc, would be appreciated.
Thanks,
Robert

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