CQ12T Noise Floor

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This topic contains 2 replies, has 2 voices, and was last updated by Profile photo of travroy travroy 3 months ago.

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  • #118414
    Profile photo of travroy
    travroy
    Participant

    What kind of noise floor is normal for the CQ12T?

    There is a hiss in my Digitakt line input which is audible in the tail end of the samples. All inputs and outputs muted on the 12T yet the hiss remains. No such noise from my analog mixers to Digitakt using the same cables (TRS to TRS).

    I’ve confirmed the hiss is present on all outputs of the 12T even when they are muted.

    #118438
    Profile photo of KeithJ A&H
    KeithJ A&H
    Moderator

    Hi @travroy

    The residual output noise of the CQ is -88dBu (https://www.allen-heath.com/content/uploads/2023/10/CQ-12T-Tech-Datasheet.pdf#page=4&zoom=auto,-274,664) so if it’s more than this then it could suggest an issue with the unit or setup.
    Looking at the spec of the Digitakt, it has unbalanced inputs. It shouldn’t make any difference to connect the balanced outputs of the CQ to these, but perhaps try an unbalanced cable (which will just short the -signal to earth at the CQ-12T TRS outputs).
    You should also ensure you have good gain staging and a healthy level at the output, better to have a strong (but clean) signal at the CQ output that is attenuated at the Digitakt to improve the signal to noise ratio.

    Thanks,
    Keith.

    #118476
    Profile photo of travroy
    travroy
    Participant

    Thanks, Keith.

    TS cables made no difference. It’s not a gain staging issue since I can clearly hear the noise via HP out with all channels muted (and compare with my analog mixers). I’ll return the unit.

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