Well, it looks like I forgot to connect the amp power which was why I was getting no sound (LOL). I took care of that problem and now everything works like a champ although the volume is a bit weak probably as you point out because the amp is expecting speaker-level connections. So I guess I should go out and purchase a little line level adaptor which hopefully is not too big since it will be quite crowded back there (don't want to cut any empeg or bmw harness wires). Even with the weak volume, the system definitely sounds MUCH better than the stock head unit even with factory amp and speakers. Anyone know of a good install shop in San Francisco that might have a line-level adapter?

Thanks,
David