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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > amping up e90 base stereo



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      04-22-2012, 12:37 PM   #1
blimft
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amping up e90 base stereo

HI Chaps
would love some help on what I think should be an easy fix.

I want to improve the performace of my E91 base Prof stereo, as most ppl do. I have read around the subject a good deal and I'm aware of the Retrofit Kit and other possible upgrades.

However, I have an existing Alpine PDX 4:100 that came form a previous car. I would like some help or instructions on how to connect this to the existing audio. ie HU, doors, & underseat subs... i'm just not sure which wires to hook up from the amp to the existing wires (the ones that are there ready to take the retrofit wiring)

please help

thanks
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      04-22-2012, 01:25 PM   #2
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Check this thread Bro : http://www.e90post.com/forums/showthread.php?t=540954
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      04-23-2012, 01:00 PM   #3
blimft
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Quote:
Originally Posted by omaragha View Post
thanks omaragha,
its an excellent post that I have looked at previously...but it doesnt answer my query.
I just want to start with fitting this Alpine PDX 4100 in.
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      04-23-2012, 02:02 PM   #4
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You can do that but will probably blow the OEM speakers.
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      04-23-2012, 02:06 PM   #5
blimft
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because of the 'pants' OEM speakers?...or coz of the amp install?
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      04-23-2012, 03:16 PM   #6
fulcrum
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Because of the pants speakers.

You will have no problem with your amp.

Just replace the fronts, add tweaters, add new floor speakers; use a technic harness. Pre LCI re code the head unit. Post LCI you will need to equalise the EQ - hence the MS8.

Plenty of posts on here about how to do it and with what but the one above is the best in my view.
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      04-24-2012, 09:49 AM   #7
blimft
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thanks...thats what i was hoping, (pre LCI? whats that stand for?)

so generic wiring from amp should just tie in with E90 wiring? (Retrofit ready)
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      04-24-2012, 10:27 AM   #8
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Life Cycle Impluse

2011 models ie about July 2010 builds onwards.

Have you read the post above?

You are gone to have to run new wiring to the amp.
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      04-24-2012, 01:04 PM   #9
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Quote:
Originally Posted by fulcrum View Post

Just replace the fronts, add tweaters, add new floor speakers; use a technic harness. Pre LCI re code the head unit. Post LCI you will need to equalise the EQ - hence the MS8.

.
I thought pre LCI you did not need to have any coding done and only the LCI models which would require coding?
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      04-24-2012, 01:47 PM   #10
fulcrum
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No the other way around - using the BMW Alpine upgrade.

Pre LCI you need to recode to HIFI

I believe, no one has yet managed to recode an LCI to back to a flat EQ.

The EQ is terrible. Professional HU has a heavily distorted EQ to compensate for the cheap speakers and lack of tweeters.

http://www.e90post.com/forums/showth...=recoding+hifi

But maybe success here?

http://www.e90post.com/forums/showth...hlight=technic

Mind you I am not even sure what system the OP which is the vital starting point has so best shut up.

Op you might be better off posting specifically in the audio section.
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      04-24-2012, 02:43 PM   #11
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Ahh learn something new every day

I am looking to go down the route of upgrading in the summer but not the alpine kit probably will go for amp/sub speakers set up
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      04-24-2012, 04:24 PM   #12
blimft
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Thanks Fulcrum, my setup is 2008, base audio (professional HU, full-range mids in front and back, no tweets.)
so my starting point is this...I have a bloody good amp PDX 4100, that i would like to install...and hook up to the underseat wires that are aimed at the Alpine Retrofit.
I thats a goer, then i shall put decent comps up front.
I dont see the point in spending huge amounts of money to retrofit with alpine stuff that i already have.
I dont want to go overboard with esoteric kit, just want to give it some oomph!
I have queried with a couple of professional fitters and they seem to think that the number system starts at 1000.
i dunno...maybe i am asking something too basic?
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      04-24-2012, 07:05 PM   #13
fulcrum
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I found most of the professional fitters did not have a clue. The ones that did where not that clean and wanted a fortune.
There will no problem using the PDX many do.
I would replace the under floors to. You can try amplifying them but I do not think they will last long.
Get a Technic harness!!!
He also sells premade speaker connector pigtails so that you can solder them on to your new aftermarket speakers then simply plug right into factory speaker connectors without cutting.
You may need some LOCs..
Run a new set of wires to the underseats, run them off of channels 3+4
Take channels 1+2 and send them to the technic harness FL/FR, then jump the connection at the underseat location to get it as far as the doors.
Splice the rears from the technic harness (i.e. connect the out and in) and run them off the OEM HU.
Get it recoded to HIFI job done.

Zaheer did it
http://www.e90post.com/forums/showthread.php?t=534506

Talk to Technic or Gizze - they know much more.
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      09-19-2019, 05:58 AM   #14
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Quote:
Originally Posted by fulcrum View Post
Because of the pants speakers.

You will have no problem with your amp.

Just replace the fronts, add tweaters, add new floor speakers; use a technic harness. Pre LCI re code the head unit. Post LCI you will need to equalise the EQ - hence the MS8.

Plenty of posts on here about how to do it and with what but the one above is the best in my view.
Do you still need to use an MS8 or other Audio Processor option if you have an aftermarket Head unit installed?
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