Our first upgrade will address the biggest shortcoming of all the stock BMW sound systems, BASS, or lack thereof.
Correct speaker level wiring diagram for interfacing with factory head units.
Use only positive (+) speaker wires. Tape off negative (-) speaker wires. Connect “+” speaker wires to RCA center pin conductors.
Tie shields (audio return) together and ground to case of radio at back of radio. Repeat for 4 channel system.
Please download here PDF | 2.61 MB
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