I collected my car today. they sourced new amp and speaker from Germany earlier than anticipated. both are replaced and now no noise heard. BMW and B&O just said to replace both parts with no quibble and didn't even want to see the faulty amp for inspection. they must be very cheap to them! if any of you guys are having the same problem, and are still under warranty, get the Amp replaced or your boot (trunk) could catch fire!!
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