The emergence of class D heads had me very excited! 800 watts in small box light box. No more lugging around huge transformers, great!   Except apart from the easy carry the rest of the story has been pretty erm stinky poo!!   Despite 8 years, five heads and every Eq patten under the sun. I simply cannot get on with the sound at volume. 😬   I”ve tried TC Electronics (BH 550) Aguilar (TH500) Tech 21 (VT) Markbass (Tube 800) and finally Mesa Boogie (D800) and no matte