Hello All! First post but trying to solve a long running issue. I consider this to be an internal hardware problem that I just wanted to see what direction makes the most sense before I pull everything out of my case.
I've had a high pitched frequency/noise coming from my external speakers for a while now. It reminds me of an LED bulb/lightbulb about to blow. You can hear it pretty far from the speakers but it's high enough people not sensitive to it don't really notice. I'll list my components below but I've swapped out the following so far: new case with new cable management, new speakers, new sound card, re-seated CPU/memory, moved the location of the PC across the room, moved to a new electrical plug with different surge protector setup, changed out the cables for the modular PSU, and moved/relocated anything that may be causing interference.
I build the PC and the only two other possibilities I can think of are the PSU or motherboard may be causing the issue. I'm leaning to the mobo but haven't decided which I want to try and replace after investing in other pieces.
Mobo: Asus Z97-Pro
CPU: Devil's Canyon i7-4790k (stock clock)
Case: Corsair Carbide Series Air 540 High Airflow ATX Cube Case
Cooler: Cooler Master Hyper Evo 212
RAM: 16GB G.Skill DDR3 2133 (stock timings)
Optical: Samsung Blu Ray Writer
Video: EVGA 780 Dual FTW (I have a new EVGA 1080 coming tomorrow)
Network: ASUS 4x4 802.11AC Wireless-AC3100 PCIe Adapter (new)
Hard Drives: Crucial M4 SSD, Intel 730 SSD, Samsung 850 Pro SSD, WD - easystore 8TB External HD
Sound: ASUS PCI-Express x1 7.1 PCI-e card (new)
PSU: Corsair Pro Series HX650 650W
Speakers: Logitech z623 2.1 system (new)
USB headset: Creative Sound Blaster Tactic 3D Alpha USB Headset
OS: Windows 10 Pro 64 Fall Creator's Update
I've had this problem using a Logitech z313 setup on using the on-board sound card. I moved to the z623 set up still with on-board sound and the problem persisted. I moved then to the PCI-e sound card and yet still the problem existed. I tried a different external sound card (Soundblaster card) and problem existed. I started to determine it must be a grounding or electrical problem. This is when I moved the set up into the new Corsair case. My original PCI-e wifi card was old so I replaced that as well.
The problem does NOT exist when I use my USB headset. The noise does seem to go away or sound slightly different once sound is being played (music specifically). It's still noticeable playing saying Battlefield 4.
I have two components left to replace (outside of the memory or CPU); PSU or motherboard. The mobo is from 2014. The PSU is from 2011. If I am going to replace either component, it'll be with an upgrade so the next investment isn't small to test out options. I don't have any extra components that will support my current system to test with. Any thoughts are most appreciated!