FWIW, after my stock headunit and amp died, I installed a Kenwood headunit and ran separate wires back to the stock Bose rear unit. (The stock wiring to the box appears to have some unwanted crossovers--I wasn't getting full-range sound until I ran new wires.) The Kenwood headunit drives the rear Bose unit--and all of the other stock speakers--just fine.
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2002 Boxster S, 6 speed, Speed Yellow
Flat Six Innovations 3.8L Stage II Track Performer, RoW M030 Suspension, B&M Short Shift Kit, Fabspeed Bypass Pipes, FVD Brombacher "Sound Version" Muffler, UD Pulley, Low Temp T-Stat.
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