that was exactly what i needed to see...
from the schematic:
green/white: negative audio signal
green/violet(purple): positive audio signal
connect the grn/wht to the inner conductor of a rca cable.
connect the grn/vio to the outer conductor of a rca cable.
red/violet: 'enable detect' ie. turns the amp on/off.
this is the board i was talking about. because it is a switching converter, there will be less heat then with a linear regulator-- and 12v-2v is a big step for a linear v reg..
there will still be some heat, but as long as you try to keep the board in a area it can get a little air, it should be fine..