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?
@clearthinker When I tested with the CD player, I isolated the DAC power supply, CD player using RCA out to Integrated Amplifier , no hiss. I just tested my Ares II , removing both toslink and USB input, hiss is still there , it is very minimal though. I will leave it now. Thanks guys for your input and sharing. |
not a ground loop. ground loops occur at 60 Hz (or 50 Hz in most parts of the world). Not tweeter frequencies. A ground loop is essentially a "signal" caused by the difference between two different ground reference points being amplified.
Can you explain this again from the beginning? We are all missing something |
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.
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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 |
