Volume is turned down on the HPA, but you hear the noise through the headphones? If the noise is through the headphones, it would suggest that WiFi might be responsible. Maybe the HPA is not adequately filtering RF from the WiFi. Does the noise stop when the track is paused? Try turning off WiFi and use an ethernet connection.
On the HPA, I think the volume pot is on the front end of the amp. Anything from the RCA will be attenuated when the volume control is turned down, which would rule out the ProtoDAC. The HPA is still sensitive to RF, which will still be amplified. The CD player doesn't broadcast RF.
On the HPA, I think the volume pot is on the front end of the amp. Anything from the RCA will be attenuated when the volume control is turned down, which would rule out the ProtoDAC. The HPA is still sensitive to RF, which will still be amplified. The CD player doesn't broadcast RF.
Hardware: RPi Zero W | Allo Kali | ProtoDAC TDA1387 X8 | PGA2311 | Icepower 500ASP | Harbeth SHL5
Software: Moode 8.3.3
Source: Win 10 NAS
Software: Moode 8.3.3
Source: Win 10 NAS
