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My left speaker emits a slight soft static high pitched noise

Hi all, 

I started noticing these last several months (or perhaps it's been there forever I just never paid attention before until these last several months) that there's a slight soft static screeching high pitched noise coming out of my left speaker only when I put my ear right up against the tweeter and could sometimes be heard from less than a foot away if my ear was right up against the tweeter. But I can't hear it at all from my listening position (my seat).
The noise wasn't audible at all when music was playing even when I put my ear right up against the tweeter of my left speaker. It happens only on the left speaker. But it doesn't affect sound quality at all. And again the noise is very soft emitting, you would have to focus on that and you will have to put your ear right up against the tweeter in order to hear it. My listening room is very quiet and small. 

I have a cheap on loan Comcast Xfinity internet Wifi modem/router sitting right next to the left speaker since the internet portal is located right by the left speaker. I have a small listening room and very limited space. So, I gave no choice. So, is that maybe a cause of that slight soft static screeching high pitched noise coming out of my left speaker? And again it's only my left speaker which is literally right next to that cheap Xfinity Comcast internet WiFi modem/router. But again it doesn't affect sound quality at all. I think that slight soft high pitched noise might have been there since the beginning of time, I just never paid attention to it until several months ago. 

Or it could have been an AC related born noise caused by noisy AC line in my old multiplex house? I live in an old multiplex house in urban neighborhood of Seattle, WA and I believed the AC line is very noisy. I'm using a Shunyata Research PS8 AC power line distributor with the Shunyata Venom Defender plugged into one of the outlet on my PS8. My AC power cords consist of Shunyata Delta NR (2), Transparent Reference MM1, PS Audio PerfectWave AC-5, Audioquest NRG-4. 

I have pretty new speakers. I bought them new last year. They are Monitor Audio Gold 200 5g (the latest version of Gold series from MA). they just came out last year (2019). The rest of my associated components are : Classe Sigma Amp2 class D power amp, Classe SSP 800 preamp processor, Cary Audio CD306 SACD player/DAC, Oppo 105 universal bluray disc player. I'm using high quality interconnects (XLR balanced analog & some digital cables) and speaker cables. 

So, what would be most likely the cause? Again it's only on my left speaker and it isn't detracting from sound quite at all and it is not audible at all from my listening position. I will have to put my ear close to the tweeter in order to notice it. I haven't experimented swapping out the left & right speakers, just in case it wasn't the speaker. What do you guys think the most likely cause? Is it the power amp, preamp processor, bad speaker's crossover, AC related born noise or that cheap on loan Comcast Xfinity internet WiFi modem/router which is placed literally right next to the left speaker since the internet portal is located right next to the left speaker? 

I'd really appreciate the inputs, thoughts and suggestions. 
Thabk you in advance. 

dilatante
erik_squires
16,128 posts
 
So, is that maybe a cause of that slight soft static screeching high pitched noise coming out of my left speaker?

Yes.  You could _try_ a conditioner, but that will only help if the issue is AC related.

Try this first. Disconnect your amp's inputs.  See if the problem persists.  If it's gone, it's likely to be picked up by the interconnect cables, and better shielded versions may be a better answer.
dilatante OP
76 posts
 
I’m using Shunyata Research PS8 AC power line distributor with the Shunyata Venom Defender plugged into it. The Venom Defender is an AC noise reduction/line conditioner/surge protector circuitry plug.
And I’m using all very good quality power cords that consist of Shunyata, Transparent Reference, PS Audio & Audioquest. 

I’m also using all good quality XLR balanced analog interconnects, speaker cables & digital cables and they are all well shielded. My XLR balanced analog interconnects are MIT Matrix 12. My speaker cables are Shunyata Venom. My digital cables are WireWorld Gold 7.1 Starlight & Transparent Premium. 
dilatante OP
76 posts
 
@ erik_squires

If I disconnect my power amp’s inputs and if the problem’s gone so it’s probably the preamp or the source component(s), right? Cause I’m using all high quality interconnects and all other cablings and they are all very well shielded. But I live in a very noisy environment as far as AC noise, EMI, RFI goes.

I even have all those unused inputs & outputs on all my hifi audio electronics plugged with those noise stopper caps.

dilatante OP
76 posts
 
@russ69  

You said earlier that you've had lots of ideas. I wonder what they are and if you don't mind sharing those with me. Greatly appreciated. 



dilatante OP
76 posts
 
@maxwave 

I'm currently using the Shunyata Research PS8 power line distributor with the Shunyata Venom Defender plugged into the 1st outlet on the PS8. The Venom Defender is basically a noise reduction/line conditioner/surge protector circuitry plug made by Shunyata and is meant to be used with the Shunyata PS8. 

And all my power cables consist of two Shunyata Delta NR, Transparent Reference MM1, PS Audio PerfectWave AC-5 & Audioquest NRG-4. 
My speaker cables are Shunyata Venom. My XLR balanced analog interconnects are MIT Matrix 12 (from preamp to power amp) and Cardas Audio Clear Cygnus (from CD/SACD player/DAC to preamp). My spdif coax digital audio cable is WireWorld Gold Starlight 7.2. My HDMI cables are 2x Transparent Premium (one from Oppo 105 to Classe SSP 800 preamp processor and the other one from Oppo to TV display). 


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