Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > X Series > X3 E83 (2004 - 2010)

X3 E83 (2004 - 2010)
Talk about the E83 BMW X3 in this forum!

Thread Tools Display Modes
Old 06-03-2011, 03:58 AM
phuksi phuksi is offline
Officially Welcomed to the 'Fest
Location: Finland
Join Date: Nov 2005
Posts: 151
Mein Auto: X3 3.0
Audio Signal for External Amp


I have had a spare amplifier and a subwoofer speaker in my garage now several years after selling my E46 where I had it installed. Now I decided to give it a try and put it in my X3.

I did some measurements today and it seems that I can fit the 10" subwoofer on the left side in the trunk where the panel can be removed. The amplifier I will put either under the trunk floor right behind the rear seat back rest or then on the right side where again there is that removable panel.

My question is what is the easiest way to grab the signal to the amplifier. Looking at the car it seems that getting to the factory amp is a bit tricky and requires that left side panel to be removed which at least in E46 was a pain to do and the X3 looks very similar.

Would it be easier to remove the driver's seat and take the signal from the woofer under the seat and route the cable under the door sills to the back? I have already added some cables from front to back so it is not that hard to do. How is the frequency going into those factory woofers? Is going all the way down as low as the signal contains without being filtered on the low end?

Thoughts? Those who have accessed the factory amp, how much did you have to tear apart to get access to it?

I guess this is the pin assignment for the factory amp. See attachment.

- p
Attached Files
File Type: pdf HiFi Amplifier Connetor.pdf (76.0 KB, 191 views)
Reply With Quote
Old 06-04-2011, 01:02 AM
Evlengr's Avatar
Evlengr Evlengr is offline
Ukemi - that's how I roll
Location: MD
Join Date: Feb 2007
Posts: 4,252
Mein Auto: 2013 Audi S4 2010 MT MCS
Processor Interface

I can help with this easily. Here is what you can use:


Rather than pick one I linked you to the whole slew of them. I would go with the MTX. Attached is where I mounted my amps and where you can pick up the speaker connections to add the processor.

If you need more help go the DIY and if that doesn't help PM me.

Attached Thumbnails
Click image for larger version

Name:	AMPS II.jpg
Views:	140
Size:	161.6 KB
ID:	280653   Click image for larger version

Name:	Speaker Wiring 002.jpg
Views:	145
Size:	108.4 KB
ID:	280654  
2013 S4 Loaded (and NO RFT's) Awesome is an understatement
2008 MT X3 RIP you were a faithful sidekick and will be missed.
2007 AT X3 RIPOS
2005 GC
2000 Jeep Cherokee
1997 Twin Turbo RX-7
1984 GTI Wolfsburg Edition Neuspeed and more
Reply With Quote
Old 07-05-2011, 11:06 PM
eeeallan eeeallan is offline
Registered User
Location: BC, Canada
Join Date: Jul 2011
Posts: 9
Mein Auto: 2010 X3 3.0
I would love to know too how to get to the factory amp!
Reply With Quote
Old 07-24-2011, 05:32 AM
phuksi phuksi is offline
Officially Welcomed to the 'Fest
Location: Finland
Join Date: Nov 2005
Posts: 151
Mein Auto: X3 3.0
THanks Evlengr for the tips. I decided to take the easy way and just plug and extra amp with a sub connected to it, with minimal efforts and pieces I had in my garage floating around.

I decided to take the signal for the external amp from the factory 'subwoofer' under the passenger seat. My amp can take in high level inputs, and also turns the amp on from those (the amplifier is DLS CA20). Then routed the signal cable under the right side door sills and under the rear seat to the trunk area. I placed the amplifier under the front trunk floor piece. The subwoofer I placed onto the left side right next to the factory amplifier where there is the piece with the net that can be removed.

It works ok and does the job that I expected. Took two hours to install in slow motion from start to finnish once I had the sub enclosure built. I will take some pictures later and post them here.

eeeallan: I can PM you some instructions. You need to remove quite a bit.

- p
Reply With Quote
Old 07-24-2011, 02:40 PM
phuksi phuksi is offline
Officially Welcomed to the 'Fest
Location: Finland
Join Date: Nov 2005
Posts: 151
Mein Auto: X3 3.0
Here are some pics.

I just removed the 2 bolts in the rear and 2 nuts in the front side of the passenger seat, then reclined it out of the way. That gives enough space to get to the speaker grille and remove it and get to the speaker connector. I unplugged and cut the speaker wires and joined another wire to them to get the signal for my amp.

The amp is now temporarily in place to do adjustments and see that it fits. I will mount it better for final installation and probably I redo the trunk floor piece to make the amp a bit visible.

Then I made two holders for the sub and mounted them to the car. The other is using the factory amp bolt and the other carrying the weight on another bolt lower.

The box, and pretty much everything else too, was made of what leftovers I had in my garage floating around. The sub is an old 10" I had in my 2002 E46 long time ago and the box is not really big enough for it but the space in the car did not really give many options unless use fiberglass or similar.

I also reused my XLR connectors and cable form the earlier installation. Unfortunately the cable was not long enough to mount the female connector to the enclosure directly like it is meant to be done. So now the connector is half way in the cable... I need to buy some cable and redo this piece when finalizing the amp mounting.

And there is a pic before the carpeting of the enclosure testing the fitment. And finally a pic with the sub in place.

To do are to finalize the amp mounting and customize the floor trim piece, the connector with a new longer cable as well as figure out how to cover the sub since the factory trim piece no longer fits there. I was thinking of taking a piece of 3mm plywood and a new trim out if it. I have not found good matching carpet anywhere yet.

There is nothing audiophile in this, no math in the box to tune frequencies, rather a quick use what you got installation to get some more boost to the <60 Hz area. It sounds nice, not boombastic but smooth low bass.

- p
Attached Thumbnails
Click image for larger version

Name:	Seat_Reclined_1.jpg
Views:	124
Size:	78.1 KB
ID:	286338   Click image for larger version

Name:	Seat_Reclined_2.jpg
Views:	112
Size:	53.9 KB
ID:	286339   Click image for larger version

Name:	OEM_Bass_Speaker.jpg
Views:	100
Size:	44.3 KB
ID:	286340   Click image for larger version

Name:	Amplifier_Testing_Location.jpg
Views:	110
Size:	73.4 KB
ID:	286341   Click image for larger version

Name:	Holders.jpg
Views:	115
Size:	87.3 KB
ID:	286342  

Click image for larger version

Name:	Testing_Fitment.jpg
Views:	113
Size:	67.7 KB
ID:	286343   Click image for larger version

Name:	Final_Before_Installation.jpg
Views:	102
Size:	74.1 KB
ID:	286344   Click image for larger version

Name:	XLR_Connector.jpg
Views:	105
Size:	65.5 KB
ID:	286345   Click image for larger version

Name:	Final_After_Installation.JPG
Views:	95
Size:	67.3 KB
ID:	286346  
Reply With Quote

See More Related BMW Stories

Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > X Series > X3 E83 (2004 - 2010)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

All times are GMT -7. The time now is 12:59 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms