I have my Yamaha TSR-7850 hooked up to my VTV Stereo Purifi 1ET400A amp via these Monoprice 1.5' XLR to RCA cables (
https://www.monoprice.com/product?p_id=4775), and for the most part it sounds great. When I first installed it I heard a lower-frequency "pop" when I switched inputs, but after talking with a bunch of people was told to not worry about it (so I didn't). However, now in the last couple of weeks, twice when I have powered the entire system up I have heard a higher frequency electrical "snap", and am wondering if it might be because of the Monoprice cables. I hear no ground loop hum or anything else out of the ordinary once the system is up and running.
My understanding is that VTV fixed the incorrect pin 1 wiring issue by the time I purchased my amp (a few months ago). I hate hearing my speakers (Tekton Lore Reference) creating that noise, as the only other time I heard it was with my old Paradigm Titans & Phantoms where the foam surrounds had rotted away and I turned up the volume. Any thoughts on whether the Monoprice cables might be causing this, or if I have something else going on? The only thing that has changed in my system is the addition of a new TP-Link 16 port Gigabit switch (which the receiver is connected to via a standard Ethernet cable), but I would find it hard to believe this has caused this issue, and if it did I would think it would happen more than once per week (the devices are plugged into the same wall outlet, but the AVR and amp are going through my Monster Power HTS 3600 MKII, whereas the switch is into a separate plug strip with a bunch of other "non-critical" home theater devices).
To me, it almost seems like a static buildup issue - once the charge gets high enough, it finally dissipates, which is now happening once per week. That's where I could see an incorrectly grounded cable or device causing this to happen. I have no idea what would be causing the static to be created though, particularly now in the summer months when it isn't as dry as it was a few months ago when I first set the system up.
Thoughts?