Date registered: Dec 2005
Vehicle: 2005 C350, 2002 ML270CDI, 1969 230S, previously 2002 A160, 1985 380SEC ivory, 1983 380SEC grey
Location: Adelaide South Australia
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if it is a W203 chaasis ie previous C Class body shape, then the HarmAn Kardon (note spelling of Sidney Harman's name) system is part of the COMAND system ie there should be a wide screen display, sta nav, etc.
On my car there is a small Harman Kardon logos on the grille of one of the rear parcel shelf loudspeakers.
On the COMAND display, there is a hard key Audio, a soft key Sound, which gives you choices between Factory Settings, Speech Optimised, and Logic 7 sound.
It you can't get this then perhaps it hasn't.....