I bought the USB input card for the Audiotec-Fischer MATCH 7UP BMW amp! Btw, I bought the amp and USB card from Crutchfield. I had to run a 10 foot (later replaced with a 15 foot) long USB cable from the console to the amp. The hard part was getting the cable run under the carpet that's between the back of the console and the rear seat! PITA! Then I had to code the amp to accept the USB input as the primary input and buy a lightning to USB A connector adapter. The sound is fantastic.
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