10/18/2023 0 Comments Audio ground loop isolator schematicFar more PEOPLE HAVE DIED likely from using extension cords or multiple outlet strips. Not a spoil sport (caution is always a good thing to bring up) but unduly alarmist I think. Plan B, replace the Vincent with either something sporting balanced inputs, or a traditional hi-fi integrated amp from large-scale manufacturers like Yamaha, Denon, Pioneer etc. A USB isolator may be another option, but these may be restricted to USB 1.1 data rates. I suspect getting a Behringer HD400 with associated cabling would give performance no better than the DAC already built into the Vincent, complete with a Toslink output. Traditional hi-fi is generally Class II (double insulated) for good reasons. Not a good match with unbalanced connections. The main issue is the ground loop between PC + DAC and the Vincent amplifier, on which I spy a 3-prong IEC power connector, which smells of IEC Class I device. Anything beyond 24/96 is completely academic for audio playback, and arguably 24/48 or 24/44 depending on DAC.) It could be injecting a signal into the ground which affects audio pins or the shield of the connector or the power supply through the USB that the DAC uses or all of them.Ĭlick to expand.You do realize you are trying to shoot yourself in the foot pretty hard, do you?Īs far as I'm aware MQA is pretty much a non-feature - it can be decoded in software perfectly fine, and nobody really needs it anyway. What it affects seems to depend on how the ground loop is manifesting itself on the PC. But this fixed it for one sound card but not another on the same PC! My USB out never showed this problem. I fixed it by lifting the PC ground and connecting the PC chassis to the amp chassis with a ground wire so it is safe. To do an uncompressed multi-channel audio out, there is no reasonable connector with galvanic isolation. After much experimentation, I realized the problem isn't created by the video card but when a ground loop already exists, the use of the video card makes it worse and introduces additional noise that may then become very noticeable. I have the same problem with my HTPC and it developed suddenly one day. The isolation transformer as suggested above on the PC power line will work. Audiowalle TP1000 power conditioner (AKA fancy power extension cord) Other than permanently lifting the ground from my audio gear, do you guys have any other suggestions? I did try different power sockets in the room, same result. The only thing that breaks the loop is lifting the ground from either the PC or the power conditioner where all my audio stuff is connected to (I did try other extension cords with same results). Connecting the DAC to a laptop (and using the laptop's battery) doesn't produce the ground hum, so the DAC is not defective. It even happens with the DAC disconnected from the current. I tried disconnecting everything except the PC, the DAC and the amp, and the ground loop persists. I bought an IFI idefender, but not only did it not break the loop, but it also introduced a new hissing sound, so it's a no-go for me. I'll just link to one nvidia thread, but I also saw it for AMD cards: This has been reported extensively across various forums.
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