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if you need to power up the amp (assuming its the same as my 03 A4 with bose), you just need 12V with almost no amps. run it into the switched 12V line. as far as tapping the rear lines, you can use radioshack wire taps and run the spkr level through a line level converter to get line level sound for your sub/amp.
Post back if you have more specific questions.
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