After way too much time on the interwebs reliving my early 20s at audio sites, I've decided on a homebrew DSP and three 4 channel "marine" digital amps.
So:
DSP - a complicated waterfall of six of these 2 in 3 out dsps will get to twelve channels. It is a bummer that the breakout card is focused on a 2.1 solution, and not a 2 in 4 out, because the chip supports it, but we do have 5 woofer channels to drive, so not that big a deal when it comes down to it. It is also a bummer that every one has to be programmed separately. That will take two forevers and a Sunday, but I fall back on the winter excuse. Programmer is $25. DSPs are $30. Each DSP will serve 2 channel and pass on a full bandwidth signal to the next one in the chain.
Dayton Audio DSPB-K DSP Kernel Board and DSPB-KE Kernel DSP Expansion 2-In 3-OutAdd the Dayton Audio DSPB-K and DSPB-KE bundle between your input source and amplifier to add powerful DSP processing to your next powered speaker or audio project! Thanks to the built in Analog Devices ADAU1701...
www.parts-express.com
These dsps have a ADAU1701 in them. It is fricken awesome and can do anything. Like 5.1 decoding, any eq, time shifting, time travel, anything. If I ever get a good tune on all six of them, across all 12 channels, it is going to sound amazing.
Amplifier - These are the cheapest, smallest, four channel digital amps I could find. Bonus! They are waterproof, so when I next find a deep creek hole, at least my amp won't blow. The three together should be manageable in size. I hope. $50 each.
Pyle PLMRMP3B 4 x 300W Waterproof Micro Marine AmplifierThe Pyle PLMRMP3B micro size amplifier system comes with everything you need to give your sound system a serious boost while providing protection against the elements. Add up to 400 Watt Max power (200 watt power on each of the 2 channels)...
www.parts-express.com
For those playing along at home, we're up to $350 before incidentals. That is the repair cost (before shipping) for the ML amp.
To run the DSPs I need a crapload of USB ports. The 6x dongle was $13. I had to buy so many RCAs to loop around 12 channels. That was $75.
Bottom line: If it will fit under the seat, I'll have a minimum 1200W system (3600W at 2ohm!), with full 12 channel DSP for less than $500.
More on this once the parts are in.