Can someone help me understand this issue?Ĭomputer (Intel i7 8700K, ASUS Z370-A motherboard, three Samsung 850 EVO solid-state drives, Windows 10, Reaper)Īudio interface (RME UCX) - connected to computer with USB 2.0, separate power transformer A simple isolation transformer is optimized for 60Hz and filters out high frequency garbage while costing 1/3 of the Mapleshade.Hi! I think I may have a ground loop but I'm still a novice when it comes to computer hardware and software. You need to filter out the garbage that the computer PSU is putting out (or get a new PSU). In fact, increased bandwith hurts because it lets in high frequency noise. I've built my own exotic power cables and power strips - they make no difference. That Mapleshade does approximately zero for any power line conditioning or filtering. Back EMF can be quite a problem, I had a refrigerator that had such a strong spike that about every six months it would blow out the control circuitry on my stove vent hood until they were finally put on different circuits. What PSU is your computer using? Power filtering varies by PSU and could make a big difference. The Focals probably cut a few corners on their power supply. In theory, it shouldn't be an issues with well designed SMPSUs, but companies are always Muntzing to save a few cents. When they're all in the same strip, there's no filtering between them. It's back-emf from the computer PSU bleeding from the computer through the power lines to the power supply of the Focals. Update: I can add that it's apparently not a ground loop from the cable box or router either, as I unplugged the power and transmission cables from both ends without effect on the noise. It's not a loud buzz or hum, as if someting weren't quite connected. But I want to emphasize that this is all modestly audible to my mid-60's ears, just enough to annoy and at moments be heard between the speakers. There's an underlying low hash, with buzzing on top of it that varies, seemingly with what the computer is doing and even sometimes with the laser mouse (I moved the transmitter farther away to improve it). It's hard to describe noise in words, but I'll try. For those not familiar with the Mapleshade, it's here: (the bottom one). But isn't that what these line conditioners are supposed to do to some degree? On the Panamax, since there are separate, isolated banks I spread things around: speakers in one bank, computer alone in another, etc. It makes me wonder if the console is serving as a noise filter. Into the wall socket, directly to computer, it's audible, like the conditioners. Into the console instead, it becomes inaudible. Yes, plugging the computer power cord into the Panamax or Mapleshade adds audible hash/buzz. Power cords for speakers and computer: either MAC HC or Shunyata Venom 3 (shielded) Teresonic ICs (shielded like plane cockpit) So I'm wondering, is there a way to solve this short of a regenerator or a specially built PC? Thanks,Ĭiunas dac, connected to computer with USB adapters (cable makes no difference)įocal CMS 40 powered speakers (virtually unshielded) Of course, using the the strip gives a bit cleaner and more delicate sound than thru the console, but the hash/buzz is annoying. But if I plug the computer directly into the conditioning unit/strip, a high pitched hash/buzz that varies with the computer becomes audible from the listening position (3 feet) and at times is "plays" like soft music between the speakers. Starting with the Focal CMS 40 powered speakers and Dell monitor plugged into one of those two, if I plug the computer into my old style console the electrical noise is inaudible until I hold my ears tight to the speakers, and even then it's light. I've tried both the Panamax M5300-EX line conditioner and Mapleshade power strip (Mk II Plus) with the same result. I'd like to ask help with an electrical noise problem (no ground fault).
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