@arctikdeth - the previous generation XPA models were completely different with full linear power supplies and huge transformers. In my opinion, Emotiva took a drop in sound quality with the Gen 3 models, which are all switching power supplies. It was purely a business decision to lower the shipping weight and design a generic platform where they can build any number of channels with only 3-4 different parts.
The XPA-1 and XPA-2 amps do not suffer the hollow bass problems. They do sound better, but they are still bright sounding (which can be fixed somewhat with fuse upgrades).
The XPA-1 and XPA-2 amps do not suffer the hollow bass problems. They do sound better, but they are still bright sounding (which can be fixed somewhat with fuse upgrades).