iwaslowr
ɹǝqɯǝɯ ɹoıuǝs
Has anyone added an amp and subs with the factory deck? I'd like to install some that are being given to me, but don't want to loose a channel by using a signal converter. Unfortunately this may be my only choice... 

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I had a 12 and amp wired to factory deck. Sounded decent. The amp I had was a pioneer and had speaker-level inputs, so I taped into wires below the center console and called it a day. If the amp doesn't have the speaker level inputs, you will need a line out adapter, but you should be able to tap into this same location. Since you are pretty much just piggy backing the signal, you don't lose anything.