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i have c250d coupe with Burmester sound(no command). I found that if you turn up bass and treble , when you turn up volume they are cancelled. try to play music through bluetooth from your mobile .turn the volume on mobile while turn up volume on car. Then try to adjust bass and treble it will...

i have harman kardon logic7 system on 2012 c 250 coupe.it has extra speakers on rear shelf plus a subwoofer and an extra speaker on the middle of dashboard.the sound is better then standart audio20 but not a superior .because when you turn volume up deep bass notes stays the same level.so the...