I have the loss off bass-tones more (allmost every day) in winter en sometimes in summer. I had it twice this week in the morning and during the day. The temp is about 68F during the day and about 50-57F during nights.

Offcourse i can buy replacements but have no idea where to begin.. could it be the amp, tv-module,radiomodule, antenna signalbooster, nav-modules or even the headmonitor... or something else ...

I have disconnected my faulty cd-changer and telephonemodule but it wasnt one of those because the loss of sound still exists....

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'01 E53 4.4i exe sport >155K-miles [daily driver]
'00 E46 323i sport >90K-miles [sold]
'01 LR freelander 2.5 V6 >90K-miles [sold]