Noise, cracks and peaks with 44.1KHz "rectangels"

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This topic contains 3 replies, has 2 voices, and was last updated by steve krafft steve krafft 5 days, 22 hours ago.

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    As there are some topics about the noise and crackles, i will start a new thread, as my problem doesnt belong to the 44/48KHz.
    I recorded a few months without a problem until lat Sunday.
    Until Sunday i recorded standart bands, like drums, bass guitars and vox.
    Everything was fine and there was no Audio artefacts.

    On last sunday i had an orchester with 15 people and the wav files are all noisy/distorting. When i look at the zoomed audio files, i can see a lot of rectangels in the waveform, that doesnt belong to the waveform.
    There are also extremly high rectangle peaks on all tracks. Even on that tracks, that are not connected.

    I am recording on an Sandisk extreme Flash drive, which was working without issues all the months before.

    Ok, when i look at the difference between my concerts:
    The only difference between my bands and the orchestra is, that the orchestra used a lot of AER Amps with XLR Di Out. That means, that i had minimum 5 or 6 XLR Cables, coming from devices with connected ground. I know, the Utrack is only writing to the drive, and the X32 is converting analog > digital. But sometimes there is no logical explanation on troobleshooting in digital devices…

    Here you can see the artefacts in the waveforms. I think this is the same “Noise”, that most user “hear” in there recordings…

    Recorded with 44.1KHz


    I forgot one imported thing.
    On my X32 Rack the 16 Mic Inputs are routed to local 1-16.
    The 6 Aux Inputs are routed to 17-22.

    – There is “NO” noise and “NO” peaks on the Aux Inputs.
    – Channel 25-32 are routed to non existing local 25-32.
    There is absolutly NO noise on the tracks 25-32 (even no noise on full zomm in).


    And also one important thing:

    The log file tells me, that everything was ok. No issue with the drive.

    steve krafft
    steve krafft

    Any further updates on this? I had virtually the exact same problem last week. Major bummer to have our live recordings fail.

    We have a dual X32 Rack setup to provide 8 stereo IEM feeds. Rack 1 has the Cymatic uTrack32, with 6 Aux inputs, 16 local mic inputs, and 16 remote mic inputs over AES50 from Rack 2. In our rehearsals, the recording was fine. At our next 2 gigs, 16 remote mic inputs (16 drums) recorded fine but we got severe crackling noise on 8 of the local mic input 1-8 (vocals SM58’s, guitar amp mics SM57’s). Interestingly, local inputs 9-16 did not fail (more drum mics, bass DI); these I routed to the uTrack32 card over Ultranet P16out[9:16]. It seems like re-routing the raw sampled inputs over P16 or AES makes it work reliably, where as the raw feeds alone can have the problem. Since the problematic local 1-8 go to the other Rack 2, I may try feeding the uTrack32 with the re-routed signals from Rack 2, over AES, assuming the issue is only with direct local mic pre inputs.

    We used a Samsung T5 SSD 512GB drive.

    This recording card is unusable for us unless we figure out the problem.

    Similar issue reported on X32 forum, though this does not support the theory that direct local mic inputs are the problem, but possibly just some blocks of 8 have the issue.

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