Mike,
I had the ZH270 in my system (multiple systems) for a while. I think I will be the lone dissenter, but I really didn't like it. I found the upper midrange to be too aggressive. I even had the upgraded cryo'd tubes. Several other friends listened to it in various systems and felt the same way. I even had David Berning check it out and he said it was working just fine. So, I am not a fan. In contrast, I've commonly been impressed with the 845 amps I've heard. I'm sure it depends alot on synergy, but it probably also depends on your listening tastes. I suppose I gravitate laid back. I like punch, I like dynamics, I like a natural sound - but I really don't like aggressive sound. I'm sure others will differ!
I had the ZH270 in my system (multiple systems) for a while. I think I will be the lone dissenter, but I really didn't like it. I found the upper midrange to be too aggressive. I even had the upgraded cryo'd tubes. Several other friends listened to it in various systems and felt the same way. I even had David Berning check it out and he said it was working just fine. So, I am not a fan. In contrast, I've commonly been impressed with the 845 amps I've heard. I'm sure it depends alot on synergy, but it probably also depends on your listening tastes. I suppose I gravitate laid back. I like punch, I like dynamics, I like a natural sound - but I really don't like aggressive sound. I'm sure others will differ!