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For the bass roll off issue keep this in mind! It is very important to always use a line out converter they are like $20 and could save you in the long run.

The reason for this is because the speaker wires you are tapping are POWERED so probably have like 40-80 watts give or take flowing at any given time which can fry your nice new amplifier's input real fast, or real slow...The RCA inputs on your aftermarket amp are designed to take an "audio signal" ONLY, which is 1-2 watts MAX if that. So think like hooking the speaker wire from a guitar amp or powered PA system into a pair of headphones. You can fry the input preamp without a LOC and your amp would have no sound anymore and be broken forever. Might not happen right away, might not happen ever depending on the amp but not worth ruining your amp. Speaker wires are not a good source for low level audio signals which are what your aftermarket amp is designed to have going to its RCA input.

They are at any store, AutoZone Advance Auto Parts, Walmart etc.. Usually $15-20

 

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An LOC may help with the bass roll off issue, but any amplifier with high-level inputs (most have this) are designed to receive the factory signal through the factory speaker outputs (wires connected to the factory speakers from the factory deck or amp).
 
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