I have owned many expensive and moderately priced amps over the years and none are dead silent. If you can't hear from your listening chair don't worry about it. If you have to know, then you have to isolate what is the source. So the only way to do that is to disconnect the entire system. Then you connect the amp and speakers and listen. Then keep adding 1 piece of equipment at a time until you isolate the offending device or cable. Once isolated, then you can work on a solution. You may even discover that your system is fine & there is something on your homes electrical grid that is causing the hiss.
What cause tweeters hiss ?
I could hear hiss sound when i place my ears close to both tweeters (ATC SCM 11 speaker) when Denafrips Ares II is connected with interconnect (XLR or RCA) during power on/off/standby. Hiss sound disappear only until power cord is disconnected.
At first I thought it’s amplifier (Accuphase E280), then I bypass Ares II and connecting Sony CD player with RCA out to amplifier, no hiss can be heard from tweeters.
Due to curiosity, i connected my Topping D90 with similar arrangement, I could hear hiss sound until I unplugged power cord.
During the above test, music is stopped, amplifier is turned on but at zero volume. All my music source, DAC, amplifier are from the same power source/circuit with Novaris Power Filter.
Can’t hear the hiss at my usual listening spot though.
What could be the culprit that create this hiss, DAC ? Grounding Issue?