I just installed a JL Stealthbox in an X5M with enhanced audio. Best option I could come up with was the 12v outlet that is switched off when you lock the car or fully power down.
If you are integrating with the OEM headunit to power more than just a sub, you will need to switch to MOST. The DIRAC amp has a lot of signal processing and weird crossover points that are tuned specifically to the drivers and environment. So highlevel outputs are not going to work very well, the sound will end up muddy and difficult to tune.
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