I purchased a VTV Purifi amp in February to add to my office HT. Prior to this amplifier, I used the amps in a Denon 4311ci and I've never had any noise / static issues in the past. All my office equipment is plugged into an APC UPS model BN1500M2 (Amp, Receiver, PC), although only the PC is on battery. At the time I set it up, I had significant static (squelching / squealing) during playback from all sources and all volumes. I worked with the owner of VTV and after replacing the RCA->XLR cables and trying some other things, which reduced the static slightly, we eventually isolated the issue to the AudioGD DAC. Any time it was plugged into the receiver via RCA, I had static, whether I was listening to that input or not. Since I didn't use that input all that much the fix was to unplug it and just be happy using the sound card toslink output to the receiver. Without this issue, the noise floor is low enough I can't discern any at all.
Initial Signal Path -
PC -> Creative Labs Z/XR -> Toslink -> Denon 4311ci
AudioGD NFB 11.28 -> RCA -> Denon 4311ci
That was all well and good until today, when I decided to try to plug my GPU into the receiver via HDMI. The goal here was to remove the compressed 5.1 audio from optical and use the built in Dolby / DTS encoder on the graphics card. When plugging in HDMI, the static is back (I've tried multiple cables). So now I'm at 2 different sources that cause static, which leads me to believe this is an issue with the amplifier (or possibly my receiver). Prior to being used in my office, the receiver was on family room HT duty with many inputs (Phono, HDMI, optical) and had the front 3 speakers of a 7.2.2 on an external amp and never had any static problems.
Anyone have any ideas what could be causing this horrible noise? This isn't going to be a viable setup if I can only use 1 toslink input.
Edit: I used an outlet tester and confirmed the outlet is properly grounded. My office is also on a dedicated circuit at the breaker.
Amp Details -
VTV AMPLIFIER Stereo Purifi Audio 1ET400A Amplifier
Initial Signal Path -
PC -> Creative Labs Z/XR -> Toslink -> Denon 4311ci
AudioGD NFB 11.28 -> RCA -> Denon 4311ci
That was all well and good until today, when I decided to try to plug my GPU into the receiver via HDMI. The goal here was to remove the compressed 5.1 audio from optical and use the built in Dolby / DTS encoder on the graphics card. When plugging in HDMI, the static is back (I've tried multiple cables). So now I'm at 2 different sources that cause static, which leads me to believe this is an issue with the amplifier (or possibly my receiver). Prior to being used in my office, the receiver was on family room HT duty with many inputs (Phono, HDMI, optical) and had the front 3 speakers of a 7.2.2 on an external amp and never had any static problems.
Anyone have any ideas what could be causing this horrible noise? This isn't going to be a viable setup if I can only use 1 toslink input.
Edit: I used an outlet tester and confirmed the outlet is properly grounded. My office is also on a dedicated circuit at the breaker.
Amp Details -
VTV AMPLIFIER Stereo Purifi Audio 1ET400A Amplifier
- Input Buffer: Stock Hypex Factory Buffer
- 12V Trigger: 12V Trigger Option
- Binding Post Option: Default Binding Post
Last edited: