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Should I wire that in before my factory amp to add an amp and subwoofer or after the signal is amplified ? Thank you
![If you can't hear this then you're not an audiophile [See description for link to followup video]](http://i.ytimg.com/vi/48PxwspDvrE/mqdefault.jpg)
Should I wire that in before my factory amp to add an amp and subwoofer or after the signal is amplified ? Thank you