Help needed to eliminate unwanted noise from tweeter

Thanks so much for your advise.

@carlsbad2 In my opinion, not the price point to determine a good power conditioner with respect with my rather cheap audio equipment. My previous Tacima CS947 did a good job with no hiss noise, the shortcoming is only six-outlet, as I added music streamer, thus I upgrade to Novaris PP10 with 8-outlet.

@musicfan2349 I think AP is not the culprit, when my CD player is turn on with amplifier, there is no hiss, only when I plug in Ares II or DMP-A6.

@audphile1 Yes, I try to turn on CD player, there is no hiss from tweeter, yes, it is the same as the youtube but no that loud, just "ssszzz"

@curiousjim I have both XLR and RCA connected from Ares II to E280, most of the time I am listen via balanced out, should i disconnect the RCA cable?

@kfscoll Yes, I am able to tolerate with the hiss sound ( I am too not hearing hiss sound at my seating position)... just that when I go near to change my CDs when music is stopped, it’s rather annoying to hear the "unwanted" sound.

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. 

@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.

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.

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.