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TOPIC: Buffer / Clocking problems?

Buffer / Clocking problems? 2 weeks 1 day ago #34052

  • geoffmartin
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Hi,

I'm using an HA-DSP with a MacBook Pro (13", early 2015) and OS 10.12.6. The HA-DSP is connected via USB audio, and I'm currently using it with all EQ's set to 0 dB gain...

I'm testing the headphone output of the device using a TPDF dithered, -1 dB FS sine sweep that runs from 20 Hz to 20 kHz over 60 seconds. The file is a 44.1 kHz / 16-bit wav format (although I've tried other sampling rates and bit depths). I'm playing using both the Apple Finder "preview" as well as Audirvana. The Audio MIDI setup is set to send 44.1 kHz, 2-ch, 24 bit (although I've tried other settings here and I'm seeing the same problem. )The problem does not exist on the same computer using the built-in headphone output. (Note that the same artefacts are present when I play from the Mac's Tidal application directly to the HA-DSP - but they're potentially difficult to hear, depending on the music's content...)

I've ensured that this is not caused by the volume setting on the HA-DSP or the Mac's internal volume setting.

When playing the file, there are easily-audible click's in the signal. These are at random intervals and appear to be either
- buffering problems
- some kind of clocking problem
- artefacts similar to, but worse than a typical skip/insert strategy.

These are happening simultaneously on both channels of the output.



Above is a screenshot of a recording of the problem, showing two instances. This was recorded using a semi-pro sound card connected to a second Mac (to avoid any blame of conflicting clocks causing the problem) using Audacity.

Any thoughts on (1) the cause of this and (2) the possible solution?

Thanks
-geoff

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Buffer / Clocking problems? 1 week 4 days ago #34112

  • devteam
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@ Geoff

Sorry for the late reply.
This is very odd and unfortunately not something we;re able to see here with the AudioPrecision..
I think that it would be very valuable for our engineers to get the same setup here (though we don't have an Imac from 2015, only macbook Pros and mac minis). Would you mind to please start a tech support ticket with our team? (support.minidsp.com)

We can take it from there to figure out what is this issue.

devteam
MiniDSP, building a DIY DSP community one board at a time.
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Buffer / Clocking problems? 1 week 3 days ago #34126

  • geoffmartin
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Hi,
Thanks for the response. I'll make an official ticket.
Just a small comment that this is not something that would normally show up with an Audio Precision, since it's not periodic.
The fastest way to detect this is to listen to a swept sine tone.

Also note that I'm also running on a MBP - not an iMac. I can try it with a 2011-mode 15" as well, just to verify that it's happening on both machines.

cheers
-geoff
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Buffer / Clocking problems? 1 week 3 hours ago #34185

  • devteam
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@ Geoff

Thanks for the info. Our team received your tech support ticket and will forward the info to the engineers. We have few headphone amps here streaming music on our stations for our staff(not using Macbook pro but Win to stream though) and don't have the issue. Engineers will look into if they can reproduce it on Macbooks.

DevTeam
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