Is it possible to just switch the head unit and increase the sound quality. I'm thinking of switching it with either an alpine or panasonic flat screen. Thank you!

What year is your 140?

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The Mercedes Specialists Since 1986

Hi Steve,

My W140 is actually a 1995 s500 coupe. Thanks! Sorry for the delay response. Happy New Years!

i also have w140 1994 s320 with sony sterio, im realy dissapointed with the sound, it just seems empty almost hollow even with the "loudnesson" option, a real lack of bass and was wondering about just changing the unit,
if anyone has any opinions .......please

Your speakers may be "out of phase", meaning that the positive and negative connections are reversed on at least one of the four speakers. All speakers must work in harmony, meaning the cones must move in and out in sync. If not, they will try to cancel out each other, leaving missing bass, no imaging, and other phase anomilies that will give you headaches. An easy way to test is to use the balance and fadar to compare sound with one speaker compared to all speakers. If they are out of phase, it will have more bass and in general sound better with one. Use a D-cell battery at the head unit speaker connections (unplugged from the unit). Figure out which is supposed to pos and neg, touch them to the respective battery terminal, the cone should move outward from the speaker frame when touched. If you find that one moves inward, switch those connections and you should have better sound.

great advice, thanks , not sure what you mean with d-cell, not a term im familiar with in the uk

just tried the balance and fader, it all sounds the same, just cant believe its ment to sound like it does

what to do now
does anyone have any wiring diagrams for w140 audio system

Wiring is here:
W140 Speaker Replacements

thanks for the link, couldnt open the filr though.

The files are zipped pdf. Save it on you disk, then unzip, then use Adobe Acrobat reader to open them.
Mike

GOT IT . THANKS