@blang11, every amp regardless of type produces an audible hiss (heard from tweeter) when it is powered on and connected to efficient speakers. For those who believe or state otherwise I'd venture to say they simply cannot hear it. That wouldn't be unusual because we all know that as we age we loose the ability to detect high frequency, dome more than others.
My ears are discerning enough that if I put them within an inch or so of the tweeter I can hear the difference between an amplifier that is powered on versus powered off.
My ears are discerning enough that if I put them within an inch or so of the tweeter I can hear the difference between an amplifier that is powered on versus powered off.