I'm currently using a Musical Fidelity A300CR power amp and Nu-Vista CD player with B&W N804s. Love the sound ... excellent results from top to bottom. I think Gregg lett is right about the dual mono configuration. The A300CR is a true dual mono amp with 225 wpc. Previously, I was using a Rotel RB1080 (200 wpc) which is NOT a dual mono piece of gear. Didn't like the sound at all, and felt the N804s weren't living up to their potential. The dual mono amp made a huge difference and really makes the B&Ws sing.