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as soon as the head unit gets power going to the amps the subs before any music is played give a really hard thump, its not long, just one huge thump. Is it due to a bad ground on the amplifier, bad turn on lead, is the amplifier just bad?? or could it be rca cables going into the amp, the amp wasnt installed by me and I was just wondering what the problem could be first without me having to pull the drivers seat out. Any help is appreciated, thanks.
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