Your speakers are connected the right way round I hope, positive to positive and so on?
....and, I cant let this go, no surround when watching the Matrix??
Studios spend millions making the sound do what it does and it is genuinely 5.1 to 9.2 separate channels of information, a door opens behind you, you hear it behind you. Sounds of a housing estate in the rear channels whilst watching Pulp Fiction, helicopters swirling around during Apocalypse Now
Something still does ring quite right with your system though, it doesnt list it exactly but that amp should be about 60w for your 8 Ohm B&W. There may be an option to 'bi-amp' - it was an option for my STR-DH820, that will boost the listening volume by almost 10%
2 channels for film... Poor old Ray Dolby will be spinning in his surround sound noise reduced grave.