Page 1 of 2 12 LastLast
Results 1 to 10 of 11

Thread: E34 stock stereo and subs??

  1. #1
    Join Date
    Apr 2008
    Location
    pa usa
    Posts
    18

    Default E34 stock stereo and subs??

    I have a 90 525i with a stock head unit and was wondering if i could hook a sub up to it with out changing the head unit bc the stock black goes so well with my interior and i hate the tacky aftermarket ones. I do have upgraded speakers idk if that matters or not. I'm not really experienced in sound systems so any help would be greatly appreciated

  2. #2
    Join Date
    Feb 2004
    Posts
    4,892

    Default

    Yes, it can be done. What you need on the sub is line input or use an adapter... splice the channel frm the amp using the speaker wire that sends the signal from head unit to amp.

  3. #3
    Join Date
    Apr 2008
    Location
    pa usa
    Posts
    18

    Default

    ok what do u mean line input or adapter and would a different amp make this situation better or worse??

  4. #4
    Join Date
    Feb 2004
    Posts
    4,892

    Default

    Usually an amplifier uses RCA cable for the music signal. Some amplifier has both speaker wire input and RCA... we are looking for the speaker wire input. If you don't have speaker wire input, then you need speaker wire to RCA adapter.

    Basically the head unit put out speaker signal to the factory BMW amp... and BMW amp then amplify more and crossover to 10 speakers in the car. That is the wire we want to splice into to feed into the amp... the one from head unit into the bmw amp.

  5. #5
    Join Date
    Apr 2008
    Location
    pa usa
    Posts
    18

    Default

    I found this website and was wondering if this is basically what ur saying. plus it has pictures lol. If so do this mean i have to run two amps like this website is showing? sorry for all the questions but I have never done anything like this before. I really appreciate it thanks

  6. #6
    Join Date
    Feb 2004
    Posts
    4,892

    Default

    URL please?

  7. #7
    Join Date
    Aug 2008
    Posts
    879

    Default

    You should be able to do this with just an amp for the subwoofer.

    I don't want to say for sure it will work because the e34 shares grounds and it might mess up the front/back fading, but it should work.

    You just need to steal a signal from the wires going to the factory amp, like tiger says. The signal you steal will go to the sub amp.

    Your sub amp needs a Left and Right signal. Each of these is on a circuit and needs the signal to return via a ground. The amp uses RCA cables which have two wires in them, the signal wire and the ground wire.

    You can take an RCA cable and cut one end. The outer braided wire is the ground and the wire in the middle is the signal wire. You want to connect these to the appropriate wires going to the factory amp. Use this plug layout to find them...



    The appropriate wires are the ones in the 'input' box. See how there are only two shared grounds (L- and R-) with the four signal wires. I would suggest using the rear signal (RL+ and RR+). Do these splices... Left RCA -> inside to RL+, outside to L- ... Right RCA -> inside to RR+, outside to R-. Make sure the original connection to the factory amp remains intact!

  8. #8
    Join Date
    Apr 2008
    Location
    pa usa
    Posts
    18

    Default

    Sorry i meant to put it in there but forgot lol http://www.bmwe34.net/E34main/Upgrad..._subwoofer.htm

  9. #9

    Default

    Quote Originally Posted by bmw_525i View Post
    Sorry i meant to put it in there but forgot lol http://www.bmwe34.net/E34main/Upgrad..._subwoofer.htm
    Yep! Pic #5 is the best way when using factory HU

  10. #10
    Join Date
    Feb 2004
    Posts
    4,892

    Default

    Yep, that is the way to do it.

Page 1 of 2 12 LastLast

Similar Threads

  1. Wagon Amplifier for Stock Stereo
    By e34m30SF in forum 5 Series BMW
    Replies: 1
    Last Post: 07-07-2008, 07:14 AM
  2. OT: WTB Stock Stereo
    By darkbeer in forum 5 Series BMW
    Replies: 6
    Last Post: 01-04-2006, 03:25 PM
  3. Stock Stereo Question
    By s.c.estes in forum 5 Series BMW
    Replies: 5
    Last Post: 03-06-2005, 12:06 AM
  4. Dissatisfied with stock stereo? Try this...
    By Warren N.CA in forum 5 Series BMW
    Replies: 7
    Last Post: 07-19-2004, 04:37 PM
  5. Stock Stereo Questions
    By stargazer_61 in forum 5 Series BMW
    Replies: 2
    Last Post: 07-14-2004, 05:55 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •