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I used a Audio Dynamics IDQ 8" V.4 Subwoofer in the stock Bose enclosure with a Rockford Fosgate PBR300x1 Amp and a PAC AP4-GM61 to get a low level signal from the factory amp without the muffled bass at higher volumes.

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Nice clean upgrade. The Amp Pro is awesome, I love mine. If you haven't found a place for the bass knob there is a perfect spot in the middle cubby under the radio.
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