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?



I have owned many expensive and moderately priced amps over the years and none are dead silent. If you can't hear from your listening chair don't worry about it. If you have to know, then you have to isolate what is the source. So the only way to do that is to disconnect the entire system. Then you connect the amp and speakers and listen. Then keep adding 1 piece of equipment at a time until you isolate the offending device or cable. Once isolated, then you can work on a solution. You may even discover that your system is fine & there is something on your homes electrical grid that is causing the hiss.

It seems to me that if the noise goes away when you unplug the DAC, then the problem is in the DAC or its source.

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. 

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.

Consider the obvious.  The tweeter is a transducer, it has no intrinsic energy of its own (other than the kinematic energy imparted to it by gravity which will not produce a sound unless you drop it on the ground).  If you take the tweeter out of the speaker and hold it to your ear you may hear noise.  Obviously the tweeter alone has no power going to it so it can't be 'transducing" so what you hear is similar to what you hear when put a seashell to you your ear at the beach (go look that up, the education will be good for you).

Tendinitis is another possibility for a un-powered tweeter appearing to be hissing.  If you have a mild case of it there is there is a chance that by concentrating on the tweeter, you are perceiving the results of this medical issue.

Otherwise this question is wrong.  One must as 'Where the signal coming from?"  The answer would have to be the electronics driving the driver.  Something is producing energy, this is a great trouble shooting exercise to sharpen you inductive (not deductive, no matter what you think of you readings of Sherlock Holmes, he was a master of inductive rather than the deductive reasoning processes.  Again, do some homework, it will be good for you.