I too hav3 class D A great small company in Denmark Pascal Audiomake excellen5 digital modules. I bought the Danish
Gato Audio 400-S then they build their own analog input output sections ,and International rectifier developed a super high speed switcch8ng for their 2 high power Mosfets my integrated sounds
like a very sweet SS- Tube combination . Of course I upgraded
the fuses ,and put a very good Oyaide Sunami Power cord
and in processs of matching the wiring throughout.
VH Audio has a Excellent Wire Thea Cotton centercore are multi Litz Small Wire awg21 solid core Upocc solid core Copper and thin porous Teflon which is the closestdielectric to air. Incredible wire, I did the whole Xover and cables ,speaker cables , now Amplifier power supply, and Loudspeaker terminals ,also
to all replace any Brass to at least high purity phosphor Brinze
or gold over Copper RCA Connectors,IEC input ,and Speaker connectors .
Over 70 % of companies use Gold over Brass rca, IEC, and speaker terminals, Not Good but true.i sold audio for many years.. Itis a amazing upgrade the conductivity is 3-4x better ,which is a fact . just lookup metals resistance ,conductivity,and great wire
throughout creates a fantastic synergy, I also use premium Xover parts and bypsss caps, and the Zobel networks I make for the back of a Loudspeakers is simple but effective ,and cost effective.
if you or a friend is handy these are things to Strongly consider doing. You raise your systems potential at least 15% minimum is not more.