Just installed one of Alpine's advanced CD receivers with Bluetooth along with one of their KTA series powerpack 4 channel amps in this 2007 BMW Z4 si. We are running Alpine's powerpack on the kick panel speakers as well as the 2 subs. The other 6 speakers are still using the factory amp. No easy task incorporating aftermarket products into this BMW 10 speakers factory system. Major sonic and feature upgrade to this factory stereo! #Crisp&Clean
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