I realize my answer is outside of your specific question but please do consider the Raven Audio tube integrated amps. (Listening now and again amazed at jaw dropping clarity) I've had one for six months and it is quite beyond my wildest hopes for musical nirvana. So transparent, lifelike, and packs way more slam/power than stats state. I know your B&W's are power hungry. But I'm sure you will be completely blown away by the complete control these amps grab the speakers with. The Osprey is rated at 40 watts but I'm sure 400 never could do what these 40 will do. (My last rig boasted 175 per channel...Not even close to my Nighthawk's 20!!)) No risk. Complete free return after trying ....USA made. New Raven fan
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