Amp for B&W 802N

If I owned your speakers Classe would be one of the first places I’d look for an amp.  Classic pairing. 

Take a look around for the CAM-600 if you can swing the price. Those speakers take a lot of power to get the most out of them. Like soix mentions above, Classe is a fantastic pairing to B&W

You should be fine with Classe 400M mono amps. You should also consider getting a matching preamp. That Marantz receiver is way out of its league there.

You should also consider getting a matching preamp. That Marantz receiver is way out of its league there.

@audphile1  Huge +1.  The preamp section of pretty much any AVR flat out sucks and will be a tragic bottleneck to better sound.  The preamp is one of the most critical components for better stereo performance and ignore it at your peril.  If you’ve got a combined HT and 2-channel system you can seamlessly integrate a stereo pre such that the AVR is completely out of the signal path for stereo and you can switch between HT and 2-channel with the push of one button.  Can elaborate if needed.