Originally Posted by motrek
Indeed, I've never heard a combination of amplifier and speakers that don't produce a hiss when the amplifier is turned on. Have you?
My NAD And B&W speakers does not produce any noise what so ever, even if you are 5 inches away from speaker, because generally I listen to he music at maximum -5db volume which is deafening already (depending on the music type)
If I don't play any source and just turn up empty volume to 0db or max +15bd (100% vol) then I hear noise too! You can't fix it in real world, maybe in a scientific lab.
Amplification of sound does not happen in computer, you need to set it at max volume output if you using external speakers and control the volume on your Amp. There won't be any noise. Seems to me You are creating your own headache.
Just like others said, lower efficiency speakers just need to be amplified more to hear same hiss, hey do not filter the hiss out of equation.
The proof is in 3 amplifiers that you tried and all produce same hiss because you put them under same condition where they're amplifying at max volume.
My OPPO 205 has volume control. If I decide to run my amp at full volume just so I can use volume control through Oppo, then I will hear the noise too when Oppo stops playing, and while it's playing the noise is just masked, but still there. My Oppo is set at 97% and I use volume control on the NAD and no issues.
Same goes for TV watching...running your amplifier at 100% just so you could control volume on a TV remote is wrong, it's backwards to what you should do, and the resulting hiss would be similar to yours.