Amp install w/Bose + Navi

[mrbtd]

I am adding a very modest amp + 2 10" sub woofers to my daughters 2008 A/Coupe with Bose + Navigation.

After reading much information on this site I decided to add an amp to the existing set up using the signal from the rear speakers. The amp has a built in converter that I can run speaker wire to (it will also power on the amp) .

The question is do I tap the wires before or after the Bose amp ?

[AlexN09]

Tap them after the amp. Your sub amp is meant to take high output speaker signal so the signal before the amp likely isn't strong enough.