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Option for Logic 7 remote turn on external amp
Hi I don’t have a M5, but what I can tell you is that I just installed a 10” powered Pioneer subwoofer into my E93 3 series convertible using the device below. So once this is powered on you can connect the remote wire straight to the AMP from the trunk. No need to run wires to the head unit or find some black wire or cd changer option or any other nonsense.
Helix AAC.3 Converter - High Low Adaptor Signal Converter for Car Radio AAC3. Oh and tapping into the subwoofer speaker wires is not a problem at all.
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