No audio right channel - PeachParts Mercedes-Benz Forum

optimus · #1 03-03-2006, 06:45 PM

1992 300se (just got it) only get static or silence from right side of car,thru radio or trunk mounted disc player,this is the mb set up.

96C220 · #2 03-03-2006, 08:26 PM

I dont know about the w140's but my w126 had a pair of stereo amps (one for each side of the car) behind the rear seat back. One of them failed and I experienced the same exact problem as you. I think the w140's stereo amps are in the trunk though.

That might be the first place to look.

Take care,

George

optimus · #3 03-04-2006, 06:45 AM

thats where i will look,ive heard that the 140's have six amps in them.

optimus · #4 03-04-2006, 05:17 PM

I need the amp#140-820-0089 for my 300se.

Peter Guenther · #5 03-05-2006, 09:25 AM

The 92 S class was equipped with a "Bose" system. Font is only the control and cassette, the tuner is in the trunk at the base of the rear wheel, the failure prone 7 channel 11 speaker amp sits a little higher up. The front is routed thru a large din thru the CD and back to the tuner. The tuner has a two channel output and is fed to the "Bose", the front to rear is handled by the fader on the console, and right to left by the front controls.
There are four speakers on the rear deck in pairs, the front doors both have two, the rear doors one each, and a tweeter behind the rear viw mirror. The speakers at the ends of the dash were only used for the CellTell and get no audio. The system changed in 94/95 to a different one piece radio and amp.
http://www.mercedesradiorepair.com/
http://www.carstereohelp.com/strmercedes.htm
http://www.beckerautosound.com/

optimus · #6 03-05-2006, 04:26 PM

Quote:

Originally Posted by Peter Guenther

The 92 S class was equipped with a "Bose" system. Font is only the control and cassette, the tuner is in the trunk at the base of the rear wheel, the failure prone 7 channel 11 speaker amp sits a little higher up. The front is routed thru a large din thru the CD and back to the tuner. The tuner has a two channel output and is fed to the "Bose", the front to rear is handled by the fader on the console, and right to left by the front controls.
There are four speakers on the rear deck in pairs, the front doors both have two, the rear doors one each, and a tweeter behind the rear viw mirror. The speakers at the ends of the dash were only used for the CellTell and get no audio. The system changed in 94/95 to a different one piece radio and amp.
http://www.mercedesradiorepair.com/
http://www.carstereohelp.com/strmercedes.htm
http://www.beckerautosound.com/

After reading this i was ready to get my hammer and pliers and fix it,thank you for this really good info,the links were great too,there is one on flea bay for 349.00 but it only had a 90 day warranty,while the link above is 440.00 but includes a 3 year warranty,thanks again this forum rocks.

Peter Guenther · #7 03-05-2006, 04:40 PM

WE share our experiences, while they did my amp they also did the tuner, $500 or so 5years and going!

optimus · #8 03-20-2006, 07:44 PM

Peter i am waking this old thread up to ask if anyone knows if the speakers are a common problem that cause these amps to fail? i have used after market stuff for years and have a nice home entertainment center that i put together,this was the warning that came with a used amp for the above car.

96C220 · #9 03-20-2006, 08:26 PM

Quote:

Originally Posted by optimus

Peter i am waking this old thread up to ask if anyone knows if the speakers are a common problem that cause these amps to fail? i have used after market stuff for years and have a nice home entertainment center that i put together,this was the warning that came with a used amp for the above car.

Peter,

Aftermarket speakers could definitely cause the OEM MB bose amplifier to fail. The bose amplifier uses a somewhat proprietary design, in terms of the impedance of the speakers it is designed to drive. Most bose systems use 2ohm speakers, to basically take advantage of ohm's law, and achieve louder spl levels from lower power amplifiers. The sacrifice of course is increased distortion, but at general levels this is still acceptable. What I would do is test the OEM bose speakers using a mulitimeter to determine their impedance. Once you have established the impedance of the stock drivers, if you wish to retain the bose amplifier you must match the impedance in the aftermarket speakers of your choice. The key to suitable replacements here is thinking outside the box and looking at raw drivers rather than standard aftermarket car audio replacement speakers which are available in much wider impedance ranges than conventional car audio speakers which are pretty much standardized at 4ohms.

Take care,

George

optimus · #10 03-20-2006, 10:06 PM

I am not going to change speakers just replace faulty bose amp when the new(old)bose amp arrive.

Cleeve · #11 03-21-2006, 11:44 PM

The Bose W-140 amplifier has almost seen it's days. We have serviced them for over 6 years now and have not had one come back due to any electronic failure. We are very strict on the repair standards and have found improvements to bring out the best in these amplifiers. When these amplifiers are working well the car sounds fantastic. The cars are getting older and therefore spending a large amount of money to fix the sound system is hard to justify. I can only say that if you want to keep the car original then fix it. This would be the least expencive way to solve the problem. Just be cautious on where you get it repaired. Reputation is very important and price should not be the main concideration. Spend wisely not cheaply. Thank you for using Mercedes Shop Forum.

Cleeve Morrison
La Jolla Audio Repair
www.mercedesradiorepair.net

optimus · #12 03-22-2006, 07:24 PM

Cleeve i did it cheaply and it sounds ok

...........but the the right rear pass door speaker has no audio or any sound,if i had a tin ear i could live with it..now to find out if it's the amp or speaker.this was easy there is no speaker in that door just the grille