Can anyone elaborate on the overall sound of the GB GBE series amps VRS the GB Class D amps? I've been playing out with the GB 9.2 Shuttlemax over the last 2 years and recently felt that when I had to really push it hard it just didn't have the punch that the former class A/B amps I previously played had. I'm considering purchasing a GB GBE-750 head in hopes that I'll get the same basic sound with a bit more punch. If this has been covered in a previous thread I'd appreciate someone sending me the thread link. I tried several searches but couldn't find anything. Thanks!