| Electronics > Beginners |
| Unwanted digital noise (Not the standard noise floor) from studio monitors |
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| Vildhjarta:
Hi! A few months ago i bought a pair of Yamaha HS7 studio monitors to use together with my desktop. I will list my gear first so that you can form a picture of the situation as you read. Tower: Cooler master Cosmos SE midi tower Motherboard: ASUS Z170-E Socket 1151 Processor: Intel Core i7-6700K skylake Processor water cooler: Corsair hydro series H115i RAM: Crucial Ballistix Sport 16gb GFX: GTX1080 G1 gaming SSD: Samsung 850 EVO HDD: Seagate Desktop SSHD PSU: Corsair CX 600M 600W Wifi: ASUS PCE-AC68 AC1900 Fans: 2x140mm in front, 1x280mm on top and 1x120mm in the back External soundcard: Tested with both Focusrite Scarlett 4i2 (USB powered) and Focusrite Saffire 26 pro (Separate power supply and firewire connection) Studio monitors: Yamaha HS7 active monitors Cables: Standard power cables with ferrite beads. All jacks and XLR cables are balanced. Firewire cable is a IEEE 1394 compliant one. Monitor: ASUS 24 inch LED Keyboard and mouse: Corsair K55 and SteelSeries Rival 300S When i plugged them into my Focusrite Scarlett 4i2 sound card (USB powered) there was this constant buzzing noise, which was emphasized whenever i moved the mouse or did anything that demanded power from my desktop. I tried changing the power outlet configurations to all different permutations with wall outlets, power strips (with and without surge protector), but to no avail. I then tried to disconnect all the hardware on my machine except the processor and storage units, still no difference. I then checked that all the cables were properly shielded, although i haven't opened any of the components since my electronics skill isn't up to par. I have googled this for hours but nothing seems to work. The only thing i can imagine it being is some kind of resistance issue in the power cable for my PSU, which makes it easier for the ground to go through the firewire, out in my monitors and down through the power cables there. This is so frustrating, considering i have spent lots of money now on failed attempts, my recordings sound like crap (The buzzing affects my guitar pickups, so the closer i move to the machine the worse the sound gets) and it is impossible to use my monitors when playing games or such. If any of you have any ideas, or want to help out i would be really grateful! I will update this post continuously as i come up with more info, and take some pictures when i get home! Thanks! :) |
| iMo:
How it works with your notebook? |
| Vildhjarta:
I will see if i can get my hands on a laptop today! If the noise is absent on the laptop, what would you suggest the issue is? :) |
| magic:
--- Quote from: Vildhjarta on November 25, 2019, 07:35:21 am ---buzzing noise, which was emphasized whenever i moved the mouse or did anything that demanded power from my desktop --- End quote --- Oh yeah :D --- Quote from: Vildhjarta on November 25, 2019, 07:35:21 am ---The only thing i can imagine it being is some kind of resistance issue in the power cable for my PSU, which makes it easier for the ground to go through the firewire, out in my monitors and down through the power cables there. --- End quote --- Yep, that's the thing, usually. Even if your ATX ground cabling has 1mΩ of resistance, that's still 10mV of ground bounce when the CPU turns on and off and draws 10A of current from the 12V rail. If the speakers have their own Earth connection then they see the signal riding on top of that bounce and can't tell them apart. A cheap not-really-solution: load all CPU cores to 100% ;D Do you have balanced inputs on those speakers? |
| Vildhjarta:
Yes, the outputs on both cards are balanced as well as the inputs on the monitors. I tried the setup with a Macbook now. No noise with nor without the charger connected. Do you think the high resistance resides in the PSU or in the power cable for the PSU? Thanks for the reply! |
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