the manual on dvp5500s states that the 5.1 channel out will be connected to front, center and rear speakers. May i know if there is a 5-channel amplifier inside the player? Or does it mean powered speakers. And since it has a volume control, is it okey to connect the 5.1 out of the player to the 5.1 input of a receiver? this time two volume controls, one from player and the other on the receiver. tnx