Over the years I've owned many different combinations of amps, preamps and more recently several integrateds. Slight hiss or hum at speakers is not abnormal. Some amps had more than others but I wouldn't necessarily correlate the amount of noise with sonic quality once the music starts.
How Much Hiss Is Normal?
I have some Quad 12L Actives that I'm still setting up. I notice an ever so slight hiss from the speaker even when it's not connected to anything. You have to be right next to the speaker to hear it though. The volume setting does not change this. I'm reading that this is not uncommon for (other) powered speakers. They are both connected to a power cord surge suppressor. I assume this is normal??