Rattley, Yamaha have been using automotive type audio chips for some time. I have them in both my 740 and 220. The chip in question is the Sanyo LA4705 which will run up to 24V and 25W per channel. All they've done in the 2000 is to up the voltage from 12 to 16 which theoretically ups the output to nearly double that in the 740.

Bryan