BAT-VK500 dead quiet, I can have me ears right in front(or behind) the panel and hear nothing, the most dead silent amp I have ever heard.
Quietest amplifier you have ever owned.
I hate it when I'm sitting in the listening chair with no music playing and you can hear the sound of the amplifier coming through the speakers. I was curious what the quietest amps out there might be. One example I can think of would be the Antique Sound Labs MG-SI15DT integrated amplilfier. With the amp on and no music playing I can put my ear right up to the speaker and hear nothing but dead silence. This is probably the quietest amp I have ever had and it probably has something to do with it's single-ended design.