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E34 (1989 - 1995)

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  #1  
Old 05-20-2015, 07:49 PM
4heid 4heid is offline
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amplifier bypass wiring question

Since the e34 uses a parallel ground setup, how do you resolve the issue at the stock amp connector with a replacement amp and negative speaker terminals?
Also, what do I do about using a 2 way crossover on my new mid and tweeter combo without split grounds at the rear?
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  #2  
Old 05-20-2015, 09:15 PM
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TheEinstein TheEinstein is offline
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The speakers all have + & -

IOW putting an amp in for all ten channels is as straight forward as can be considering 4 tweets, 2 mid-high, 4 mid-bass/woofers.

As for head unit back to amp, the factory setup is line level or "RCA" between the two. So either terminate the factory harness adapter with 4-RCA solder/solderless male connectors and connect to pre-amp outs on head unit (like I've done and used happily for years), or do it "right" and run some RCA cables.
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  #3  
Old 05-20-2015, 09:33 PM
4heid 4heid is offline
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Yes, I have already run rca's to the rear BUT the parallel grounds do not feed all the way to the back. I will be doing a front only 3 way system and I need to add a passive crossover for the mid and tweet before plugging into the amp but this requires a separate ground from each speaker, which aren't at the rear.
Have others run a separate unique ground from each speaker to the rear to solve that issue as I can only find a unique positive for each speaker.

the head unit is already connected as needed with power, remote, ground, illum, etc. and no speakers.
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Old 05-21-2015, 09:15 AM
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TheEinstein TheEinstein is offline
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It's been a while so bare with me, but some amps are bridgeable. I may be forgetting to consider something, but check continuity between the amp negative speaker terminals. They may be a shared line, I believe they most likely are not if not a bridgeable amp. If they are shared, you can use the common, or shared ground setup as the factory amp does. Looking at the ETM schematic, it appears there is a ground lead for each quadrant of speaker sets. So 1 front left, 1 front right and so on.

Edit...If the amp is does not poses shared ground, to answer your question about wire running... yep.
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1995 E34 540ia
160,000 Miles
VIN# ...GF32404
Hellrot Red

Fuelly

My Basic Repair History (Edited 1/27/2015)

Ongoing comparison between two E34 540ia's

OBC4 Hidden Functions : Link

Last edited by TheEinstein; 05-21-2015 at 09:16 AM. Reason: Edit...
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  #5  
Old 05-21-2015, 09:18 AM
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TheEinstein TheEinstein is offline
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Or you use passive crossovers at each quadrant using existing wiring. That will just require some fun work at the speaker harnesses near speakers.

Edit... Obviously, you pick a channel to the front/left, front/right, rear/left, rear/right.
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1995 E34 540ia
160,000 Miles
VIN# ...GF32404
Hellrot Red

Fuelly

My Basic Repair History (Edited 1/27/2015)

Ongoing comparison between two E34 540ia's

OBC4 Hidden Functions : Link

Last edited by TheEinstein; 05-21-2015 at 09:19 AM. Reason: Edit...
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  #6  
Old 05-21-2015, 09:53 AM
4heid 4heid is offline
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If I put the crossover up front, will it still function correctly given the ground issue at the trunk connector?

I am going to use an alpine amp which is bridgeable, I just want to make sure the passive cross will work and the filter settings on the amp also.

I am using a tweeter/mid as the front and the woofer as the rear on a 4 channel amp so I can control the filters.
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  #7  
Old 05-21-2015, 12:18 PM
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TheEinstein TheEinstein is offline
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If you wish to use the amplifier's built in crossovers/filters, you will need to run separate wires. That is, unless it is capable of supporting the shared ground terminals. Basically, at the factory amp you have Front/Left Tweet+, Mid+, Bass+ and a shared negative. Duplicate for Front/Right. For Left/Rear Tweet+, and Bass+ with shared ground. Follow? So you have 10 positive channels/leads/speaker wires, and 4 negative leads.
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1995 E34 540ia
160,000 Miles
VIN# ...GF32404
Hellrot Red

Fuelly

My Basic Repair History (Edited 1/27/2015)

Ongoing comparison between two E34 540ia's

OBC4 Hidden Functions : Link
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  #8  
Old 05-21-2015, 08:04 PM
MySatinDoll MySatinDoll is offline
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I got kind of lost in what's going on. (probably because I'm on allergy meds)
If I understand correctly your trying to replace the factory amp with a aftermarket one.
You're wondering how to wire up the fronts and rear speakers to replicate the factory 10 channel but having issues because of the ground wiring?

I take it you have the pin outs for "e34 wiring" if not I put them in the bible as PDF downloads.

I have uploaded a pic of my setup. Hopefully it will help.


edit: a better pic.


The multicolored lines are the factory speaker wires while the clear gold lines are from the amp.
When it came to the front speakers I spliced the tweets and the dash mids together.
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Last edited by MySatinDoll; 05-21-2015 at 08:18 PM.
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  #9  
Old 05-21-2015, 08:08 PM
MySatinDoll MySatinDoll is offline
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Fix it
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Last edited by MySatinDoll; 05-21-2015 at 08:18 PM.
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  #10  
Old 05-22-2015, 05:31 AM
4heid 4heid is offline
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Yes that is EXACTLY my question, those limited grounds because I alneed to use a passive crossover on the tweeter and mid and there isn't a ground for each at the back. However I am bei ng told that upstream from the old amp connectors there are all of the grounds before they consolidate. So I will begin looking.
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  #11  
Old 05-22-2015, 05:35 AM
4heid 4heid is offline
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If I understand your pic mysatindoll you spliced the positives of the tweeter and mid into the same crossover + terminal. If that's right then they are crossing over at the same frequency, no?

Where did the negative come from?
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