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I don't think those bass blocking capacitors work.
I also have a 12" sub in the trunk and my door speakers sound terrible. I disconnected the power plug to the factory amp in the trunk that powers the door speakers and I can now put the volume up to 100% and its nice and clear. I eventually will replace the door speakers and get an aftermarket amplifier for them along with a new headunit that will allow me to crossover the frequencies correctly.
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