Just had a look, the Yamaha RX-V663 (I'm guessing is the one you mean) looks very similar in spec to the Yamaha DSP-AX763, but without listening to them, it's very hard to say if they are the same...
thx professorhat.should i buy yamaha RV-V663 or denon AVR-1909 or onkyo SR-606?i own a kef 2005.3 speaker system.thx again.i had to choose between those 3,because yamaha DSP-AX763 is not available in my country(malaysia)