Ermmmm... just a thought, if this installer has worked with Mk.1 players you'd better check that he hasn't installed the Mk.2 in the same way. With the Mk.1 it was necessary to ground the line cables at the amplifier - if you try this with the Mk.2 you'll get terrible noise. The Mk.2 line cables shouldn't be grounded externally at all, and any exposed connectors should be wrapped with tape to prevent them touching metalwork. This is the same as for just about any after market head unit.

In summary - your installer should FORGET anything he knew about the Mk.1, and install a Mk.2 in exactly the same way he would a CD head.

Rob