Trim

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

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  • #107561
    Profile photo of MiG Eater
    MiG Eater
    Participant

    Hi all, could someone kindly explain what Trim does? I understand it’s a digital version of the Preamp but I don’t know why and when I need to use it. The manual doesn’t tell me much.

    Thanks!

    #107570
    Profile photo of KeithJ A&H
    KeithJ A&H
    Moderator

    @MiG Eater

    It’s not really digital version of the preamp even though both are gain stages at the beginning of the signal path.

    Preamp gain is a gain stage that is only positive/additive. In the SQ (and all of our digital mixers) the preamp gain setting is controlling a physical, analogue preamp which is connected to an XLR input.
    The preamp consists of preamp gain (0dB to 60dB) a 20dB pad (for hot signals) and 48V phantom power.
    This lives directly after the input socket and before the signal is converted to digital, so it’s worth noting that when using expanders, this preamp is in the expander and is controlled from the desk.
    Also note that even though the preamp can be controlled from a channel (in the processing screen) and settings can be stored in a channel library, because it’s a separate physical thing, it is not actually a part of the processing. For example, you can control a preamp that has not been patched to one of the 48 input processing channels by touching the socket number in the I/O screen.

    Trim on the other hand is a digital gain stage which does exist as part of the input channel processing.
    It allows you to increase or attenuate the input signal with a range from -24dB to +24dB.
    You can use it to adjust the signal on a particular input channel without altering the analogue preamp stage.
    This is useful whenever two things are using the signal from one socket and you only want to make a change on one particular channel:
    – FOH and Monitor digital splits
    – Double patching of a single source with separate processing
    – Recording/streaming post preamp or using tie lines (where you don’t want to make lots of gain changes in post)
    Trim is also used to adjust the level of any digital input signals i.e. those coming from another system, option card (Dante/Waves/MADI) or USB.

    Hope this helps!
    Keith.

    #107575
    Profile photo of MiG Eater
    MiG Eater
    Participant

    Thanks so much Keith, I really appreciate your time in explaining that! Legend.

    #107619
    Profile photo of WaihekeSoundie
    WaihekeSoundie
    Participant

    That was so helpful!
    Thank you

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