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      05-31-2007, 01:34 PM   #1
crimsone90
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Drives: MR E92 M3
Join Date: Apr 2007
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Ultimate Subwoofer Installation Guide (Instructions inside)

So the Subwoofer DIY SUCKS. So after months of trying to find a good subwoofer DIY I finally found the proper way of doing it myself. You`ll need an Amp installation kit and a Hi/Lo converter. Here are the most important things you`ll need.

1. Remote: The remote will power on/off you amp. There is a very small black cable on the amplifier cables that is perfect to use as a remote. It powers on when the ignition kicks in and powers off 3 minutes after all the doors are closed. Just tap your remote cable there. Has been working perfectly for 6 months already.

2. Amp to Radio: You`ll need a Hi/Lo converter to connect the aftermarket amp to the radio. Please make sure you tap into the subwoofer channels and NOT the rear right/left speakers channels as advised in the DIY. Tapping into the rear speaker channels will not yield the low frequencies the subwoofer needs. The hi/lo converter has a right channels -/+ and a left channel -/+. Please make sure you tap into the subwoofer channels as described below. Here is the diagram (thanks to E90post member etik) :

HIFI System
Amplifier to Speakers

SUB LEFT
Red/White +
Brown/Yellow -

SUB RIGHT
Red/Blue +
Brown/White -

FRONT LEFT
Blue/White +
Blue/Brown -

FRONT RIGHT
Blue/Black +
Blue/Brown -

REAR LEFT
Yellow/Red +
Yellow/Brown -

REAR RIGHT
Blue/Green +
Blue/Brown -

LOGIC7 System
Amplifier to Speakers


SUB LEFT
Red/White +
Brown/Yellow -

SUB RIGHT
Red/Blue +
Brown/White -

FRONT LEFT
Blue/White +
Blue/Brown -

FRONT RIGHT
Blue/Black +
Blue/Brown -

REAR LEFT
Yellow/Red +
Yellow/Brown -

REAR RIGHT
Blue/Green +
Blue/Brown -

CENTER
Black/White +
Black/Brown -

REAR LEFT WOOFER
Yellow/Red +
Yellow/Brown -

REAR RIGHT WOOFER
Blue/Green +
Blue/Brown -

3. Amplifier Power + Ground. This can be taken directly from the battery. Please make sure you add a fuse within 18" form the battery for safety reason.

4. Amp to Subwoofer: This step is very simple. Just use speaker cables to connect the positive and negative side to the subwoofer.

So there you go, you have the remote, the amp connected to the radio via the stock subwoofer channels, the amp connected to the battery and the amp connected to the subwoofer!

Let me know if you have any questions.
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