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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?

 

auronthas
51 responses Add your response
erik_squires
16,056 posts
 

I’m not sure how you get any sound at all with the power cord unplugged. 😁

But we generally hear ground loops as a hum, except!! Digital ground loops. They are a real thing that can occur with USB or coaxial digital connectors.  I have never heard of this causing more than excess jitter though.


Seriously though, it should be 100% illegal to sell a DAC that doesn’t have complete galvanic isolation for it’s digital inputs.

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