As a car audiophile I can say that I know of no such product. I'm sure if there were I would have seen it at either IASCA or USAC this year.
Your best, although not cheapest, bet is to go with either a digital EQ, a cross-over, or a digital processor (usually includes an EQ).
I am currently using the Alpine PXA-H510 Doulby Digital Processor. It will do ProLogic, Doulby Digitial and Doulby Surround. It has TOS-LINK inputs and 6 channel outputs.
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Stereo:Alpine IVA-D900 Head Unit | Alpine PXA-H510 DSP | Boston Pro Component Speakers Upfront | Boston Rally Rear Speakers | 2 Polk 10" Subs in the Trunk | Phoenix Gold Ti900.7 Amp
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