Ha, I just realized I missed the part in the first post where the dash speakers are already replaced. I'd be replacing the door speakers next, and then a question for anyone who might know-
Does the factory amp have a low pass filter built in for the doors, or is that in the head unit? I would think it should be in the amp, if it is, you'd get the full spectrum out of the doors by swapping to an aftermarket amp.
You still run into the problem of the small door speaker size, I think you'd be wasting your money getting an amp that produces anything over 50w RMS. I think if you get a 6 channel amp that puts out around 50w, and then run the full signal through aftermarket speakers, you'd get more volume and better sound than getting a more powerful amp and lowering the output to match the factory speakers.
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