Speakers on left side of car make a popping sound, and no music, I took the dash unit out and the door speaker is popping too.

What car?

1990 420sel
1991 190E 2.6

the car is a 420sel 1990, the radio is the 1480 becker, I would also like to put in a kaplunk cd player, need help with wire lay out and color codes. my son left to go to one of his friends and he has all the equipment with him as to the #s on the cd player when he gets back I will post those for you too.

Could be a couple of things. 1. The fader switch could be going south (not uncommon). 2. There could be a loose wire behind the radio or... 3. Look behind the side trunk lining on the passenger side. If there is an electronic radio tuner, then you have the updated system. So behind the rear seat back you will find radio amplifiers on each side.(left/right amps). Swap them to see if that makes a difference. As far as installing a new H/U, I ran a new set of wires for each speaker and bypassed the fader.

well I do have the new unit it has the amps behind the back seat, when I unplugged the front dash and door speakers the popping lowered in its loudness, the rear speaker has a very low not loud pop but if I pull the ground wire off it gets much louder. if I unplug the fader you can hear the pop in the rear, with the front unplugged you can hear the music over the pop in the back speaker. I have swapped the amps no change, will try bypass, need to fix this so I can put the CD in.

I deleted my last post. It was erroneous.
Sorry

we have this cd player to replace the original radio with, but I thought I should fix one before starting another, but my son thought it could be in the radio, I may try to hook the cd player just to see, I will have to do a bunch of soldering since I do not have the plug ins with this player, it was a used unit out of a wreck benz, but the dummy cut the wires.

Ok put the blaupluk cd player to the wires and still have that popping in the left front, I suppose the amp is bad or the speakers? I think I am over my head. But I do wonder if I put all new wires into the speakers this would bypass the amps, will that efect the sound?

I have the skimatic that was posted, it has six wires mine tho has eight wires. Then the fader itself has three on one side and five on the other. I notice on the five we have on marked #58 the next is ground,then E2,S2, A2 the plug has 2 blu. 1blu.1rd. in the middle,then 2rd.
I need some input to figure out the grnd and the blu gry wire. thanks

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ONED WORD FADER replace it,i guarantee the front/rear fader is breaking,im sure of it,buy a used one on ebay for $20.00 install it it will fix the issue,im 95% sure,if not then wow you better call a pro.lol