Class A vs. AB vs. D... can you hear a difference?

My system is all bowers and wilkins.
802d htm1 in the front.
802n for the back channels.
804S for expansion chanels.

My amp is am anthem statement p5.

I am looking to add the 804s speakers for 6 and 7 channels.

Short of buying another anthem statement amp. I am looking into other options.

Anthem makes their mono amps. 1000 watts (for me over kill) but it is a class D design.

I had thought about class A.... but I hear of a lot of heat coming from the amps. And I want to be more effienct.

B&W recommends speaker cables with a low ohm per a given foot.

I am not one that believes cables beyond a certain point help or hurt. But then again my ears are not all that great.

So that is the background for my question on amps classes.

I could easily use the anthem for surround channel only.... if I found 3 channels to use up front from another amp or amps.

Thanks
Bill

I guess it should be pointed out that I am looking at get peak levels of 105 db. (THX standard)