Totally agree with Tigerwoodhorns that the Musical Fidelity A308cr preamp works well with the N804 tweeter.
The A308cr has greater bass extention and a softer presentation than the A3.2cr pre.
Also, I see many people like to use solid core copper speaker wire with B&W's. I've found AudioQuest CV-6 works well. Found AudioQuest Gibraltar lets too much detail to come through.
As for an Amp, I'm just about at my witts end.
However, I am now of the opinion that a class A power amp
with MOSFET's is the way to go.
BAT VK 200 ???
.