Currently have the audi symphony. For some reason the sound goes up and down randomly... It's really annoying. I am assuming it's the head unit. I could be wrong about this any tips would be good. Until I find a fix I'll just upgrade it to either the nav plus assuming the system will sound the same ? Or is it worth upgrading to a kenwood double din with nav. I worried my bose sound system won't work fully with the kenwood head unit. I.e. The steering wheel buttons won't be compatible ? Also will all the speakers work ? I would love the kenwood with higher quality screen etc and I assume if I get one of the top end ones the sound quality should be just as good ? I am completely clueless about this stuff so any advice would be awesome thanks.