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  #1  
Old 12-01-2008, 10:34 PM
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New Blaupunkt CD Player But Speakers Quit Working Temporarily

I installed a new Blaupunkt Bahamas MP46 CD player in my 1979 300SD W116.

I have the red ignition power wire connected to the red factory radio wire. I have the yellow constant power wire spliced into the dome light switch. I have the black ground wire connected to the two factory brown radio ground wires. I have the violet power antenna wire connected to the factory power antenna wire. The black sub output wire, white GALA wire, green TELE input wire, and the orange illumination wire are not connected.

I have the eight speaker wires connected to each other in pairs of two and then each pair is connected to the four factory speaker wire connections, which lead to a fader switch and then split off to each of the four factory paper speakers.

I powered on the ignition and instantly the unit lit up. I flipped down the faceplate and inserted a CD. It played fine with no issues, and then I turned the ignition off and locked up the car for the evening.

This morning I started the car and the head unit (CD player) came on and started playing the CD. As I was driving along I turned up the volume so I could hear the music more clearly. A few moments later I heard a crackling noise coming from the speakers and then the music sounded like it does when the speakers are maxed out. Soon all I could hear was a constant static with no music. I adjusted the volume and it made no difference. I thought that perhaps I blew my speakers.

After work I started the car and was surprised to hear that the speakers were working again--and well! I turned up the volume a little as I drove off and then started hearing some pops and then intermittent static and music. After that I could hear no sound at all until a few moments later when the static noise came back.

I went to the bank and when I started the car back up after leaving I could hear the music again. I did not adjust the volume, but left it at a low level. Suddenly the music became almost inaudable, and then the static came back.

I stopped at a store and after shopping I started the car and could hear the music playing again. I kept it at an almost inaudable volume and the music kept playing until I shut off the car.

So, it seems that the speakers always work when the car is first started, but then quit after a certain time. They seem to stop working sooner if I have the volume up high.

Does anyone have any idea what is going on? I don't think this is any fault of the speakers, as when the car is first started they sound clear and fine. I know they can play at a loud volume, as I had a tape deck in there previously (that was stolen), and they will play a loud volume for a few moments before making the static noise. I am wondering if maybe this has something to do with the fader switch.

The right rear speaker has a spot that was chewed on by a mouse, but the metal wire looked intact and when the speakers work, either all of them work or none of them do.

Any input is appreciated.
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  #2  
Old 12-02-2008, 04:14 AM
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ohm issue with the speakers, or a speaker wire grounding with the vehicle.
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Old 12-02-2008, 04:43 AM
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Sounds like its wired funny.



Is the fader fully bypassed?
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Old 12-02-2008, 10:23 AM
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The fader is not bypassed. Maybe I will try putting the speaker wires into different spots to see if it changes anything. I have the front left and front right positive, rear left and rear right positive, front left and front right negative, and rear left and rear right negative speaker wires grouped together. This setup worked fine on my older tape deck but maybe this new CD player does something weird to the speakers (like overpowers them without the volume sounding loud).
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Old 12-02-2008, 01:56 PM
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You might wanttry this site to answer any of your questions.

http://forum.sounddomain.com/ubbthreads.php/ubb/postlist/Board/3/page/1o
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Old 12-02-2008, 11:32 PM
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Thanks for the link.

I disconnected the head unit this morning to prevent any potential damage. Hopefully I will have some spare time this weekend. I will bypass the fader switch and wire all eight of the speaker wires in the body directly to the eight speaker wires from the head unit. Then I'll see if I still have problems.

I'd rather wait and not have to rewire or replace the speakers for now. I just want to be able to have the volume loud enough to hear my music well at all speeds. I may replace the factory paper speakers with some new Blaupunkts or something if I can find ones that fit. I may rewire the speakers if necessary for better sound/volume/head unit longevity.
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Old 12-02-2008, 11:56 PM
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I would completely bypass the fader.
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  #8  
Old 12-10-2008, 06:59 PM
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I cut the fader switch off and removed the wires going from it to the head unit. I then took all eight speaker wires and connected them directly to the corresponding eight wires coming from the head unit using a connector block. The stock Mercedes speaker wires are a heavier gauge than the ones coming from the head unit.

I powered on the head unit and it plays much louder now, with better sound quality. The speakers continue to work even at high volume. My problem was either with the fader switch or the way it was wired to go from eight wires to four. Only thing is at high volume the speakers buzz a bit, but that is to be expected of 30-year-old paper speakers. I will probably replace them with some new Blaupunkts if I can find some that fit.

The new Blaupunkt Bahamas head unit matches the interior very well. I am very happy with it, but not sure if Blaupunkt still sells this model (it's not listed on their site). It comes with a remote control, has a mute button and can be turned on and off, is bluetooth/iPod/MP3 ready, has automatic sound (volume increases with speed), 4,096 display colors, CD-RW compatible, 4X45 W built-in amplifier, etc.
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