06-19-2025, 08:01 PM
(This post was last modified: 06-27-2025, 04:08 PM by rongon.
Edit Reason: Probably not solvable
)
I have a RPi 3B+ in my bedroom, running moOde 9.2.1 with music files stored locally on a couple of 512GB USB thumb drives connected to the USB ports on the RPi itself. The DAC is a Topping D10, connected to a USB port on a powered USB hub.
I hear faint clicks/pops during playback of higher resolution FLAC files (24/96 and 24/192) or DSD files (.dsf).
I don't hear those noises while playing back 16/44.1 or 16/48 FLAC files.
I don't hear those noises while playing back 24/44.1 or 24/48 FLAC files.
Any ideas on what might cause issues like that?
I tried the same DAC I'm using with this RPi3B+ connected to my RPi4. It worked fine (no clicks/pops).
I also tried my other known-working DAC with this RPi3B+ and it too played back with pops/clicks on high sample rate files.
That makes me suspect that the issue is not caused by the DAC.
I'm not resampling (no SoX, etc.). No EQ (e.g., Camilla), no crossfeed, etc.
I find that the problem is a bit less severe if I keep the plastic RPi case open and let the CPU 'breathe'. I added better quality heatsinks to the ICs on the pcb, which did help a bit, but has not completely fixed the problem. Is it possible my old RPi 3B+ is overheating while processing those larger files?
Can cache or buffer sizes cause this kind of problem?
Any recommendations for settings? I set buffer sizes to defaults in MPD.
The next thing I'll try is to move the USB thumb drives to the powered USB hub, in case it's a power supply current draw issue. That seems like a stretch, but at this point anything seems worth a try.
Any suggestions for what else I should try?
Thank you in advance for any suggestions you can send my way.
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I hear faint clicks/pops during playback of higher resolution FLAC files (24/96 and 24/192) or DSD files (.dsf).
I don't hear those noises while playing back 16/44.1 or 16/48 FLAC files.
I don't hear those noises while playing back 24/44.1 or 24/48 FLAC files.
Any ideas on what might cause issues like that?
I tried the same DAC I'm using with this RPi3B+ connected to my RPi4. It worked fine (no clicks/pops).
I also tried my other known-working DAC with this RPi3B+ and it too played back with pops/clicks on high sample rate files.
That makes me suspect that the issue is not caused by the DAC.
I'm not resampling (no SoX, etc.). No EQ (e.g., Camilla), no crossfeed, etc.
I find that the problem is a bit less severe if I keep the plastic RPi case open and let the CPU 'breathe'. I added better quality heatsinks to the ICs on the pcb, which did help a bit, but has not completely fixed the problem. Is it possible my old RPi 3B+ is overheating while processing those larger files?
Can cache or buffer sizes cause this kind of problem?
Any recommendations for settings? I set buffer sizes to defaults in MPD.
The next thing I'll try is to move the USB thumb drives to the powered USB hub, in case it's a power supply current draw issue. That seems like a stretch, but at this point anything seems worth a try.
Any suggestions for what else I should try?
Thank you in advance for any suggestions you can send my way.
--
