Alpine PXA H701, PXA-H800 Zapco DSP8 Arc Audio PS8 Soundstream Synthesis Audison Bit 1 Helix P-DSP , C-DSP Rockford Fosgate 360.3 All of these have 4 pairs of outputs that are each configurable to do anything, with separate equalisers per channel, time alignment, crossovers, etc etc, and all of the...