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i wouldn't waste time upgrading the rear fill speakers. I've put 75w rms crossed over at 110Hz without any distortion at high volumes so the drivers seem pretty durable. as for fidelity you don't want to rob your front stage imaging with too much brightness in the rear. the real problem is the 3.5" in-dash components are crossed over too high causing excessive brightness. this may be creating too much of a gap between the front and the rear. instead of increasing the brightness in the rear, try adding warmth to the front stage by removing the cap on the driver and crossing it over at around 110Hz instead. This seemed to work well for me. i'm using a 6 channel amp to handle all the crossover work. this also relieved the muddiness of the in-door subs. the oem amp and crossover for the door subs is basically garbage.
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