I was wondering the same thing, and e-mailed the tech support at TC. They got back to me and said the BG500 is not SMPS, nor is it class D. Its an old-school transformer power amp with a class A/B power section. That tells me that the RH amps and the BG amps are certainly not the same thing at all.
Kinda figured that.
The only other downside was that I had to haul it up two flights of stairs at the gig.![]()
Sorry!

