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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

Showing 1 response by gs5556

gs5556
1,218 posts
 

Try plugging the amp and the digital into the wall to rule out the power conditioner.

Does the Sony CD player have a two prong plug or three? If it is a two prong plug all you are doing is lifting the ground, which is why the hissing disappears.

The problem could be in the XLR connections of the digital sources. If the ground is tied to signal or circuit ground, it may cause noise problems and picked up by high gain amplifiers. XLR grounds should only be attached to the chassis, but some designers think otherwise.

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