Installed the xd400 and Soundstream
Well I ended up going with the JL M400/4 (marine version of the XD400/4) and a Soundstream Stealth STL2.560. The JL powers the fronts/center and rear channels while the 2 channel SS powers the underseats. With some rudimentary tuning it sounds pretty good, I'll have to spend some more time with it to make it great, but the power is definitely there. More power than the Alpine mrp-f300 that these amps replaced.
I also added the cd changer trim to conceal everything, and just for kicks added a 12v power source to the panel for running my tire air compressor on the side of the road.
I had a question whether the JL pre-outs signal would be compatible with the non-balanced inputs to the SS amp. JL tech never got back to me, but it works just fine. Here are some pics:
First off is the old system:
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