Nihilistan

I've been looking for a 4 channel subwoofer crossover with all of the highpass filter outputs (plus the subwoofer). I found some suitable, but they're over $100 (even the cheap ones). So decided to build one and thought I might ask if anyone else's interested.

Here's what I have in mind:
(4) Single-ended inputs (FL, FR, RL, RR)
(4) Single-ended highpass outputs, each with:
- No filter (passthrough), 12 dB/oct, or 24dB/oct slope
- Phase selection (0 or 180 degrees)
- 60 Hz, 80 Hz, 100 Hz or custom crossover point
(1) Single-ended lowpass (subwoofer) output:
- Subsonic filter
-- Off, 12 dB/oct, or 24 dB/oct selectable
-- 20 Hz, 25 Hz, or custom filter frequency
- Lowpass filter
-- No filter (passthrough), 12 dB/oct, or 24 dB/oct selectable
-- 60 Hz, 80 Hz, 100 Hz, or custom crossover point
- Adjustable gain
- Phase selection (0 or 180 degrees)
- 4-channel (selectable) mixer (able to combine one or more of the inputs for subwoofer channel input)
- Electronically Assisted Subwoofer circuitry (extends subwoofer low-end)
-- Custom inverse Linkwitz transform parameters
-- On/off

- Overvoltage/polarity protection
- Fully regulated power supply
- All parts will be audiophile quality... WIMA/Nichecon caps (green), Cardas wire, 1% Vishay resistors in critical paths

Any of the above parameters can be changed (# channels, # filters/channel, types of filters, do you want 3/way xover?) upon request. I'm looking for two other people who would be interested in this crossover (to complete an entire order of custom circuit boards). This crossover has more features than any commercial crossover I've seen and has enough flexibility it should easily mate into any future upgrades.

I'll offer it in kit and assembled form. The kit will include all parts and assembly instructions. The assembled one will be a fully constructed circuit board ready for mounting. Not exactly sure on price as of right now, but it will definitely be less than anything comperable from your local car audio shop... will sound better too. GUARANTEED

Please PM me ASAP if you're interested and we'll discuss some details... If I don't get any responses by this Sat., I'm going to home-brew a single circuit board and be done w/ this project.

-- Nihil