Can you hear it from distance of 1m?
@kijanki Nope, only audible at near field, close to tweeter.
If this is not abnormal, then I am relief.
Auronthas - can you compare the hiss, changing to single ended input?
@o_holter since my Ares II manual stated only XLR or RCA can be connected at one time, I have tried RCA before, and I can hear the same hiss.