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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 2 responses by perazzi28

perazzi28's avatar
perazzi28
224 posts
 

Try floating the ground with a cheater plug and see if it dissappear. Generally, the only component that you have to ground is the preamplifier. 

perazzi28's avatar
perazzi28
224 posts
 

I should have stated to try a cheater plug on the Denafrips Ares II power cord. Many cheater plugs sold today are polarized and have a green tab on them. You should leave the tab in place.  If the cheater plug eliminates the hiss than you are good to go.

Sometimes, due to the polarized (for the common side of the outlet) plug you may have to carefully remove the wide areas of the polarized side of the plug to make both prongs equal.  That way you can rotate the plug in either direction.  It can make a difference.

Second, if your interconnects are single ended then make sure to wrap them around each other in a helix configuration.

From your description, you do not have a preamplifier.

Hope this helps and the cost is inconsequential.

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