Anticipating next upgrade after B&W 803 D3?

I am biamping ( wronging stated by me as being biwired above) the b&w speakers with the 5 channel Mac.  This should go far to solve any powering needs for the 803’s.

The ATI N series amp in 2, 3, 4, 5 channel configuration will blow your MAC 5, even in bi-amp mode. Don’t get hung up on watts, ATI class D 200W power amps with massive power supply will drive your power hungry B&W like no other amp. 

https://www.ati-amp.com/AT54XNC.php

My system has the b&w’s, McIntosh 5 channel amp biwired and a bluesound node 2i and a marantz 5014 avr used as a preamp. i am now seriously exploring the Chord Qutest dac and maybe the m scaler

Speakers? Dude! Your first priority should be a very nice stereo integrated amp (Hegel, Ayre, etc.) or stereo separates to do your speakers some justice and a good DAC ASAP followed by a better streamer. That mid-fi AVR, among other things, is absolutely killing your sound. Preamps matter!!!

Soix is correct. ^^^^

hehehe

soix drops the hammer

op - hegel h190 is worth consideration, or an older h160 or 360 if you will use your current DAC