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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 7790044" data-attributes="member: 576029">"fixing" the factory amp could cost more than replacing the whole system.'m currently repairing an Infinity factory amp from a Kia.  dealer wanted $1,000 to "repair" it.  i ordered the parts for $20 (sat in water, mosfet IC's were bad, some caps).there are several issues with integrating aftermarket.  #1 is the number of channels you need.  5 channel amps are available, but some factory amps have 7 or 9 channels, one for each speaker with active crossovers.adding an aftermarket amp on the factory sub is doable.  but how do you know it's not the sub that's bad instead of the amp?  you need to do some investigation (which can be tricky with an intermittent problem)</blockquote>

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