Occasional massive destortion/noise when upscaling

Support
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Roon Core Machine

OS: Windows 11 Pro Build 22621.1344 (latest)
CPU: Ryzen 5 3600 @ 3.6Ghz
RAM: 16GB (2*8GB) Corsair Vengence RGB Pro @ 3600Mhz
GPU: AMD RX 5700

Networking Gear & Setup Details

I have an ASUS RT-AX58U router and my core is connected over WiFi but it is a very fast (over 400mbps) and reliable wifi card. No VPN active when using Roon.

Connected Audio Devices

Raspberry Pi 3 Model B (Rev 1.2) running RoPieee acting as a network streamer (connected over Ethernet). The Pi is connected a Soncoz QXD1 DAC.

Number of Tracks in Library

1676 tracks

Description of Issue

When using Roon’s built in DSP upscaling I occasionally get an issue where the audio massivley destortes with massive amounts of noise and a percived big volume increase (this may be due to the unpleasantness of the sound however and not an actual volume increase). Here is a link to a audio clip recorded using my phone microphone which shows what this sounds like.

My sample rate conversion settings are as follows:
Max PCM rate (power of 2) – On my DAC this is 32bit, 16FS (705.6/768kHz)
Precise, linear/minimum phase
EDIT: Headroom adjustment is set to -4dB

This may in fact be an issue with RoPieee but I haven’t experienced it when using HQPlayer to send upscaled data to the DAC. The issue has never occured when only streaming bit-perfect and as mentioned occurs rarely even when upscaling. Thanks in advance :slight_smile:

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Hi @ShadowHolder ,

Do you have the clipping indicator turned on, does that turn red when the issue happens?

Does this happen when upsampling to other rates as well, or just 768k?

What happens if you connect the DAC directly to the Core, do you still get the distortion?

4

Appologies for never responding to your post, I am now fairly convinced this is a problem with either: RoPieee software, the Pi hardware or something in the way they interface with my DAC and not how Roon is sending them audio. I have no great need for oversampling and will simply stream bit-perfect.

Marking this as solved.

1 Like
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