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Where is the amp?

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audio sound
6K views 2 replies 2 participants last post by  DaniSB 
#1 ·
I have bought a Cla 2013 model. With a stock sound system and i am currently installing a subwoofer. Was at a hifi center to buy an adapter for the radio, But they told me the car has an active system. That means it is some type of audio control unit in the car other than in the head unit.
 
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