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Help needed to eliminate unwanted noise from tweeter

Hi all, need your advise to eliminate annoyance "sizzling" noise from speakers' tweeters (close listening range).

I have isolated all the power supply of audio equipment. Then plug in one by one in sequence as following: -

a) Integrated Amplifier - Accuphase E280

b) CD Player - Sony CDP-997 (standby power) - no noise observed from tweeters even my amplifier volume knob is at set to lowest position.

c) DAC - Denafrip Ares II (standby power) - Once I plug in, I could hear the sizzling noise from tweeters when my ear is near speaker.

d) Music streamer - Unplug Ares II, and plug in Eversolo DMP A6, similarly I could hear noise from tweeters.

From the above, could someone pointed me what's wrong with these two (2) units? They are three-prong with ground pin, they are connected to my Novaris Surge Protector multi-gang socket outlet and to wall recepatacle, there's earth/ground continuity.  

Your advise will help me to isolate the 'noise' issue for cleaner auditioning with thanks.

Regards,

Auronthas

auronthas
audphile1's avatar
audphile1
5,124 posts
 

Does the hiss change with the volume? If you turn up the volume on the amp does the hiss increase? If with cd player powered on and connected to the amp you have no hiss, and you are using the same exact input on the amp as you do with the DAC, then the source of the hiss is your dac.

And yes - use only one output from the dac at a time and see if hiss goes away. It might be less prominent with the RCA connected since the XLR outputs are typically higher voltage. 

auronthas OP
79 posts
 

@audphile1 

Changing volume doesn't affect the hiss.  

E280 has pre-amp and power amp option, when I press the power amp (main input  button), there is no hiss.

auronthas OP
79 posts
 

hi all, happy to inform the sizzling /hissing sound from tweeters are now gone after I replace my power strip with Tacima CS947 power conditioner... damn quiet now, with my streamer DMP-A6, Ares II , E280 turn on.

auronthas OP
79 posts
 

An interesting findings that the culprit of the hiss... it's the Novaris Surge Filter.  I managed to open this surge filter, they are organized in 5-slot, first slot is the SPD (surge protection device), 2-5 slots are twin sockets,  I slide out these slots and noticed few 3-pin socket outlets wiring terminals were loose.  Thus, I fastened all of them. 

Then, I reinstated all the slots in original manner.  After plugged in all the music sources, Ares 2, DMP-A6 and E280 and tested on both standby and turn-on mode, there's no more hissing noise from tweeter, dead quiet. I am so delightful able to find the root cause finally.

audphile1's avatar
audphile1
5,124 posts
 

Good job!!! Enjoy the newly noise free system!

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