Can I Tap Into The Harness Before The Amp

blown240

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I have an 04 with Bose. Currently its bone stock. I want to add another sub, but I would rather the factory amp didn't turn it down when the volume gets loud.

My thoughts are to tap into the rear speaker channels between the head unit and the amp. Then I can just run that signal to an amp under the second row.

Will this cause any issues that I am not thinking of?

Thanks!
 
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