Ideal if you don’t have even Harman Kardon (didn’t know you can buy an M6 without...), easier to upgrade...
As per a couple of other posts above, do a full rebuild. Let someone who knows what they do design it using elements they know. I did this, and now the feedback is along the lines “my sound system must be more expensive than the rest of the car (‘17 M6 GC)” based on how it sounds like... No factory upgrade (B&O or anything else) won’t come even close...
A couple of pointers-
- Focal splits in front and rear doors
- Mosconi 6-channel digital amp/DSP
- Focal under seat woofers
- Focal 12” sub with SoundStream monoblock amp
- Great quality installation and tuning
The key is to find an installer who knows what they do - ask around, and avoid all who give you “big brand” brochures to choose from...
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