Well, being a "newbie" or for whatever reason, I just LOST my whole post.

ANyhow, I have a solution to installing an Infinity subwoofer in an X5 ( 2004 )

No promotion here, but I am at a PRIVATE site www rich sterling com
As you will see it is mainly about FireFox AdBlock! I am just posting this because I have researched the net to no avail in regards to this subW in an X5.

rbs