Hi cumulus
Sorry to hear the X1 Harman Kardon sound system isn't sounding as you'd like it to. Check out the thread below, there was some minor discussion on the Harman Kardon system:
http://e84.xbimmers.com/forums/showthread.php?t=388437
Is it possible there's a fault with your sound system? I'm ordering the Harman Kardon system myself and hope it turns out OK. This is my first Beemer so I have nothing to coming to so I can't help you out in that regards sorry.