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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Adding Subwoofer to basic e90 system



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      07-09-2010, 05:15 AM   #1
eliotn
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Adding Subwoofer to basic e90 system

Hi folks,

My E90 SE came with basic audio system. There is no factory amp, only CD changer. Also I can not see any amp cables mentioned lots of time in this forum.

What is the easiest way to install subwoofer in the trunk ? I was hoping to take signal from rear speakers via adapter, use REM from CD changer and thats about it. I can not see how can I get to the rear speakers from the trunk ?

Help please...
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      07-09-2010, 07:47 AM   #2
Technic
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Quote:
Originally Posted by eliotn View Post
Hi folks,

My E90 SE came with basic audio system. There is no factory amp, only CD changer. Also I can not see any amp cables mentioned lots of time in this forum.

What is the easiest way to install subwoofer in the trunk ? I was hoping to take signal from rear speakers via adapter, use REM from CD changer and thats about it. I can not see how can I get to the rear speakers from the trunk ?

Help please...
You need to tap the underseat woofers for bass... there is no bass from your rear speakers in the base system.
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      07-09-2010, 11:29 AM   #3
VP Electricity
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Yes, tapping the rears would be really, really unrewarding.
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      07-09-2010, 05:22 PM   #4
FoShizzle
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When I did mine, I picked up a signal somewhere in the trunk - worked perfectly. (don't remember, its been so long) Is that because i have the upgraded sound system and the OP doesn't?
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      08-20-2010, 10:34 AM   #5
Jamesbondniuk
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Quote:
Originally Posted by Technic View Post
You need to tap the underseat woofers for bass... there is no bass from your rear speakers in the base system.

Hi, I am also going to install a sub and amp on the E90 saloon w/o iDrive.
Q1. Will I just vibration if I put a 14" sub in the boot - powered with own amp (no fold down seats).
Q2. Where's best location to tap-in to the underseat woofers, what colour are the wires?
Q3. Best location for a remote wire?
As eliotn, I dont have factory amp - doh!

Just sold my Jet Black E46 and got me this E90 baby in Graphite !

Thanks
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      08-27-2010, 01:43 AM   #6
IMissMySTi
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Quote:
Originally Posted by Jamesbondniuk View Post


Q2. Where's best location to tap-in to the underseat woofers, what colour are the wires?
REAR LEFT WOOFER
Yellow/Red + pin 14
Yellow/Brown – pin 4

REAR RIGHT WOOFER
Blue/Green + pin 13
Blue/Brown – pin 3

They are easy to spot in the harness, they are the 4 bigger wires. Hook them up to a 2-channel line output convertor and you're good to go.
From: http://www.e90post.com/forums/showth...t=52193&page=2
http://www.e90post.com/forums/showthread.php?t=138949

Quote:
Originally Posted by Jamesbondniuk View Post
Q3. Best location for a remote wire?
My wiring harness had a tiny black wire which I found out was the stock amp's remote wire. I just spliced into that. Worked perfectly.
Eliotn: Since you don't have factory amp, you could tap into cigarette lighter wiring, I have heard of other people on hear doing that.

This thread may help too
http://www.e90post.com/forums/showthread.php?t=163804
It goes over how to do SWS-8 install but the amp info included helps.

Last edited by IMissMySTi; 08-27-2010 at 01:48 AM.
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