Of those in your list, I'm guessing the Classe to be the only one capable of a class A rating.
I'm using a Primare P30 pre/pro in my 2.1 channel system and believe it to be a first rate performer sonically. It's a no frills, no thrills, bare-boned pre/pro designed with a music first approach. I've found it to be sonically superior when compared to 3 stereo preamps I've A/B compared in my home and one of them was very highly rated. The P30 also has 100% analog in 2-channel by-pass mode.
McCormack has a brand new pre/pro with a music first approach. If I were in the market for a pre/pro today, I'd check out the McCormack before any other unit.
I'm using a Primare P30 pre/pro in my 2.1 channel system and believe it to be a first rate performer sonically. It's a no frills, no thrills, bare-boned pre/pro designed with a music first approach. I've found it to be sonically superior when compared to 3 stereo preamps I've A/B compared in my home and one of them was very highly rated. The P30 also has 100% analog in 2-channel by-pass mode.
McCormack has a brand new pre/pro with a music first approach. If I were in the market for a pre/pro today, I'd check out the McCormack before any other unit.