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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
itsjustme
681 posts
 

When you refer to "power off", what precisely are you powering off?  The accuphase?  The denefrips?  Pls be very precise.

Is there no preamp in this system? I see no mention of it. Or I missed it.

What about with no input to the [preamp?  magic box? whatever is before the volume] whatsoever?  This is the "null hypothesis" and reveals the amp / preamp hiss.

 

itsjustme
681 posts
 

is this a typo?:

"Hiss sound disappear only until power cord is disconnected."

When you connect the power cord the noise goes away.  When you disconnect the power cord the noise returns?

auronthas OP
79 posts
 

@itsjustme

My bad. English is not my native speaking language. Let me rephrase my sentence.

1. Accuphase E- 280, as I mentioned in my first post , integrated pre/power amp. I further check E280 spec, their preamp to balanced output gain is 18dB, looks like quite high.

2. Hiss disappear when I disconnect power cord of Ares II

3. Power off my Denafrips Ares II

fatdaddy2
368 posts
 

Easy solution: don't stand so close to the speakers! Just enjoy the music!

itsjustme
681 posts
 

Yes, i guessed that English might be your second language, and thanks for the clarification.  Your English is vastly better than my mastery of most languages!

Your situation is a mystery.  Since the volume being down (essentially off) should black any noise coming from the Denefrips, the ONLY answer that makes possible sense is some high frequency interaction. As noted the frequency is totally wrong for grounding, plus, you seem to have it grounded correctly.

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