Adam Zielinski posted:Zackwater posted:Adam Zielinski posted:Zackwater posted:
Only hear it when I’m close to the speakers. From the responses I guess it’s normal.
Do you also hear it when the system is muted?
yes, same noise.
Actually - if your system is properly earthed, there should be no hiss whne the system is muted.
Hiss-on-mute may be indicative of inproperly earthed / grounded mains.
Hmmm, actually hiss is generated in the power amp itself as thermionic noise, though should be at a very low level and in a good amp and normal efficiency speakers only just audible right by the tweeter or midrange drivers. That is different from hum, which is related to mains which indeed is lilkely to be indicative of earthing issues, a fault, or poor shielding.
Muting in the preamp, or reducing volume control to zero, will reveal the power amp hiss. Unmuted with volume control on max will reveal hiss from preamp (and anything connected)