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  1. #1
    Junior Member
    Join Date
    Jan 2018

    piCorePlayer - crackling with RpiZero USB audio


    Thanks for the awesome work with piCorePlayer. I've been using it for a while, but recently switched from HDMI out (to a receiver) to the Aune T1 SE MK3 USB DAC headphone amp and I'm getting a crackling/popping sound. It's only occasional when listening to CD FLAC sources, but constant with DSD files (FLAC and DSF).

    I've tested a few combinations:

    • Pi Zero using USB - noticeable crackling
    • Pi Zero using HDMI out - no problem (although I can't test higher bit rates with that setup)
    • Pi 3 using USB - no problem!

    The Pi 3 testing is using the same SD card, and therefore the exact same settings, including the in-built wifi for networking, as the pi zero.

    I've played with all the options under "USB Audio tweaks" without success.

    Any idea why the pi zero has a problem, but not the pi 3? Obviously the CPU is significantly less powerful, but even on the zero the CPU is 50% idle during DSD playback.

    Thanks a lot.

  2. #2
    Senior Member paul-'s Avatar
    Join Date
    Jan 2013
    There are some underlying kernel problems with DSD and USB, that have only been recently corrected in the 4.14.y kernel. But in general pushing sound and network across the same USB controller is the source of the problem. Moving to a USB ethernet controller might help.

  3. #3
    Junior Member
    Join Date
    Jan 2018
    Thanks paul. I'll stick with the pi3 for now and wait for the upstream kernel fixes to eventually make their way to piCorePlayer. Now to find a good use for a couple of pi zeroes in the meantime!

  4. #4
    Senior Member sbp's Avatar
    Join Date
    Apr 2010
    You could also purchase a small audio DAC hat that fits directly on the Pi zero. You can find some that deliver analogue output, some deliver digital out. There are even some that contain an amplifier so you can connect the zero directly to your speakers.

    These small devices are relatively cheap and deliver great sound.
    piCorePlayer a small player for the Raspberry Pi in RAM.
    Homepage: https://www.picoreplayer.org

    Please donate if you like piCorePlayer

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