You need to move this to the audio sub forum
http://www.e90post.com/forums/forumdisplay.php?f=27
Also there may be some info in the DIY section if you search for the gateway 500
http://www.e90post.com/forums/forumdisplay.php?f=16
The above is a list of some of the subforums but not all.
You need to go to the root of e90post to get that.
Also if you could DIY your install it would help others.
http://www.e90post.com/forums/showth...hlight=dension
http://www.e90post.com/forums/showth...hlight=dension