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Just get yourself a 2-channel LOC like Peripheral SVEN2 or similar to get the signal for your amp. You may not even need a LOC as it looks like your amp accepts balanced inputs and the BMW HU put out differential balanced output. If you are disconnecting the factory subwoofer and amp then you should be able to just tap the signal going into that amp to get the signal for your sub. Otherwise, tap the signal off the right rear driver.
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