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as far as i nkow only 1 person has done a rear speaker mod but it might be fuzzy cuz the its a old speaker or w/e. you might not have made a good solder. try resoldering
eithera) Your speaker cant handle the amplified voltageb) you have accidently hooked up the gain pin, resulting in distortionc) resistence needs to be appliedd) capcitance may help but resistance is a bit simpler
a) Your speaker cant handle the amplified voltage
just run it in a series with the speakers normal