You should be cautious about connecting from the 'Line out' outputs directly to the power amp. Generally, a line out output means it is not controlled by the volume control on the receiver, meaning you'd be sending the full-volume signal to the power amp, something you probably don't want.
The 'Pre-out' connections, on the other hand, should send the signal through the volume control on the receiver.
The 'Pre-out' connections, on the other hand, should send the signal through the volume control on the receiver.