Anthem D2 runs

I recently bought an Anthem Statement D2 on Audiogon. I'm really happy with it, but I'm wondering about how hot it gets. It runs much hotter than my Anthem A5 amp, and at the back, right hand side, it's almost too hot to touch. Does anyone else have experience with this particular processor that could tell me if that's normal or not. I don't think that air circulation is a problem as it has plenty of air space all around it.