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Understanding E30 speaker and amp wiring

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    #31
    yeah, I wondered. I think I left it attached to the radio that I ended up selling for probably $5. Doh! I see it's still available new, I should order one before it goes NLA.

    I'd pat myself on the back, but I feel like I dodged a bullet. When I first looked at it again, I had no recollection of how I'd wired it originally and feared the worst (it was almost 20 years ago, lol). But earlier when I was even younger and especially dumber, I cut a huge hole in the hood of my '67 Dodge Dart to put in an ugly hood scoop. Ugh. I regretted it instantly, and ever since then I've had an aversion for permanent, irreversible mods.

    It's funny because of course when I originally did this, I didn't listen to tapes - I wanted a CD player, and later MP3s were the thing. The stock stereo I didn't assign any value to. Now I mostly listen to the radio, and I don't exactly blast the tunes. I've had the blank plate for nearly 10 years now, and honestly I'd be pretty happy with a stock, unmolested sound system vs nothing at all. Now I kind of want to make a mix tape of some 1990's music, lol.
    Last edited by nando; 05-03-2021, 03:57 PM.
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    Bimmerlabs

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      #32
      Hello, am replacing the head unit on my 91 318i Converible with a Pioneer CD bluetooth unit and removed the KE83ZBM and didn't realize there was an auxiliary amp on this vehicle.
      Where is the amp located on a convertible?
      thanks in advance
      Scottie409

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        #33
        is it in the trunk next to the antenna just like a sedan? you have to pull the carpeting off the driver's side.

        also, is your KE83ZBM for sale? Does it work?
        Last edited by nando; 01-27-2022, 01:27 PM.
        Build thread

        Bimmerlabs

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          #34
          I wanted to try and help others in return and thought maybe a video could do that.

          Luke's massive original amp bypass thread helped me out a lot. So much reading! I posted over there as well in case others are looking.

          I have a 1987 325es, CM5907, premium sound, fader in dash (6 wires), and a stock amp in the trunk. Went with a Continental TR7412UB-OR, bypass stock amp/repurpose fader wires, rewire fronts/tweeters.
          Please let me know if you see something I did wrong so I can fix it!!! I am also garbage at talking while filming...so sorry in advance.

          Hope this helps someone

          https://www.youtube.com/watch?v=lXYdEnJJVnU

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            #35
            Maybe someone can help me to figure this part. I'm trying to connect stock CM5908 stereo to aftermarket amp. My late e30 had no stock amp. I'm connecting CM5908 speaker outputs to hi-level inputs on the amp and for some reason amp doesn't like it (it shuts off after a few secs). I discovered that even though CM5908 has 4 chan. 8 wire speaker outputs, all 4 speaker "-" are actually connected to the chassis ground internally in the stereo and as a result to the car ground. Could it be that the amp doesn't want to see hi-level input signal with"-" leads on every channel being grounded?

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              #36
              Originally posted by zaq123 View Post
              Maybe someone can help me to figure this part. I'm trying to connect stock CM5908 stereo to aftermarket amp. My late e30 had no stock amp. I'm connecting CM5908 speaker outputs to hi-level inputs on the amp and for some reason amp doesn't like it (it shuts off after a few secs). I discovered that even though CM5908 has 4 chan. 8 wire speaker outputs, all 4 speaker "-" are actually connected to the chassis ground internally in the stereo and as a result to the car ground. Could it be that the amp doesn't want to see hi-level input signal with"-" leads on every channel being grounded?

              figured it out. My Kicker KEY amp didn't like to be turned on by only hi-level speaker input signal from the CM5908 (one of the Amp's options where remote turn-on wire can be left taped off and dip switch set on DC). Connected amp's remote turn-on blue wire to 12V, switched the dip switch to +12V and all is good. Actually sweet little amp, fits into the Airbag ECU bracket perfectly and even mounting holes on the bracket work with a little modification). Just had to extend LF blue wires from the middle of the dash to the amp (mounted in the airbag module location, LH side of the dash), the rest of OEM wiring worked perfectly as they all go through the left side of the dash. Basically , CM5908 speaker outputs to the AMP hi-level in, AMP speaker outputs to stock wiring. AMP is only 200 W so fits perfectly for premium sound speakers without straining the amp (45W/ea.)

              https://www.kicker.com/app/manuals/47KEY2004.pdf

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