~1s audio dropouts being experienced periodically.
Logs have been sent to RoPieee HQ with unique identifier:
f7a4603e7203944b
This is me leaving a message on the Roon forum with this identifier. Thanks for your help in advance.
Are they buffering between tracks? Are you streaming or local library? You’ve given basically no info in your post (I realise the feedback refernece will contain much more detail but you need to give Harry something to work with)
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What DAC/DAC hat are you using and what interface? Ethernet or Wi-Fi?
You forgot to mention you’re using HQP. 
Anyways, what I see is that there are errors coming from the USB bus. Not continuously, but on a steady basis. Pretty sure that causes the dropout.
I would suggest you try at a lower sample rate and/or check cables etc.
Ok. Whether streaming or local library, both.
I don’t know what “buffering between tracks” means.
Thanks @spockfish. I just changed my DAC, from a TT2 to a Mojo2. Everything else is the same.
Is there anything else you can tell me about the errors coming from the USB bus, that I can approach Signalyst &/or Audiowise about please?
Check processing speed value: if it is lower than 1 then the hw has issues ( ie not enough power available) with the configured sample rate and or modulator/filters choices
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DAC is Mojo2 (just replaced TT2). Ethernet.
Ok, then that might be the issue: your DAC causing regular errors on the USB bus.
xhci_hcd 0000:01:00.0: ERROR Transfer event for disabled endpoint slot 2 ep 1
That doesn’t say much, except that this is not an the application level (HQPlayer can’t do anything about this), but on the os/hardware level. I’m pretty sure this is a result of switching the DAC.
Have you tried at lower sample rate?
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I’m using a large part of a setup advocated by @Daniel_Mance
Mac Mini M1 (Ethernet) > RPi4 > Audiowise USB RF Filter > SRC-DX > OPTO-DX > LP-FILTER x2 > DC-BLOCK x2 > Chord Mojo 2 > Cayin HA-6A Mk II > Focal Utopia 2022
My understanding is that I can maintain the sample rate (705/768k)
Oh…
in that case: remove everything and test directly with the Chord to see if that makes a difference.
Yes, but you got an issue, right? In order to figure out what it is I suggest you do some testing.
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@spockfish No dropouts so-far with the Mojo2 connected directly to the RPI4, for the last ~8 minutes or so. Same HQPlayer settings.
605e076db9a496bd
Can you still see regular errors on the USB bus?
My thoughts exactly… Too much superfluous tech.
Processing speed is over 20x
If it works with just the Chord, start adding back components one at a time until it starts to fail. Then you have your bad component.
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This is an S/PDIF bridge for dual coax DACs, so expecting anything above 384kHz is optimistic since the Mojo only has a single coax input unlike the TT. IDK why you would go to these extremes when the USB input supports 768 kHz.
Can you hear any difference without the various filtering componenents, just the Chord DAC? If not, then you could sell them and do without.
Rather mysteriously there is so bad component once re-connected & the the rpi4 has been restarted. The dropouts are currently not happening.
@mjw I am getting above 384kHz & usb is not the input I want to use.
@Calum_Mackay yes & it’s markedly different.
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