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I have a '07 Q7 with the Bose soundsystem. For some reason the previous owner had removed the subwoofer from the trunk. The error message was of course visible in the fault codes list. I purchased a Bose subwoofer and installed it. I cleared the faults from the sound system controller.

Now the subwoofer seems to work but it's not very loud. There's no subwoofer level controller in the sound setup menu in the MMI.

Should there be a level control available in the Bose system for the subwoofer? How could I activate it if it should be there...?

Any help available here?
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