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.

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.

@ellajeanelle Thanks for your insights on swapping the noisy components to no-noise outlets, that's brilliant idea to trouble shoot.  You gave me "light bulb" that the Novaris PP10 surge protector/noise filter come with 8-outlet, the "noisy" one are first row... I may look into detail if the ground/earth terminals and other (live/neutral) terminals are secured/tightened.

About the noise I described... it's like hissing sound, as I read from google, some said they are pretty normal as my amplifier has a higher amplifier gain of 28dB, my speaker sensitivity is 85dB/m... only when i step closer to tweeter, I could hear the hiss sound.

@carlsbad2 Thanks for your tips, yes, I have done that, I will do few more times to isolate/mitigate if it is due to defective unit or if it is common "leakage" electric noise, I could further check if the unit is come with three-wire though they are using IEC outlet, in some instances, some may only terminate two-wire and leave the ground/earth "floating".

@mijostyn Thanks, I will check if it is DAC defect. I don't have any other DAC unfortunately.

@ellajeanelle Thanks for your hint.

I am not sure if this is due to WIFi/Ethernet as my WIFI is always turn on. When I unplug all except E280 and CDP-997, there’s no noise. Even non-ethenet/WIFI equipment like Denafrip Ares II does produce the noise in standby mode.(without playing any music, I am not sure if interconnect XLR or RCA is the culprit?)

FYI, I am using hybrid/Mesh network, Access Point at my listening room then short ethernet cable to my streamer.

@soix Thanks for your response. Yes, both tweeters when these two (2) units DAC and music streamer are connected. There is no noise when I connected my CD player... can’t be the tweeter issue?! Yes, as my first post stated I am using Novaris Surge Protector/Noise Filter.  
 

Will the iFi Ground Defender help?

While I am isolating the hissing noise from tweeters from potential components. I am not sure if the Novaris Surge Protector/Noise Filter, is it a good power conditioner?  I recalled I have no such issue with my previous power conditioner of Tacima CS947 (6-outlet) , I upgraded last year to 8-outlet Novaris PP10.

Anyone has experience on the above power filter/conditioner/surge protector and would like to share your thoughts?  Appreciate

@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.

Thanks @audphile1 .. I am enjoying music now with my new Tacima power conditioner/strip. It’s truly challenge to swap cables, interconnects with eight (8) audio equipment, and then found out the culprit is the surge power filter loose wiring/wire lug terminals... exhaustive work but good experience.