FOH – MON Split // Tie Lines or Direct Out?

Forums Forums SQ Forums SQ general discussions FOH – MON Split // Tie Lines or Direct Out?

This topic contains 6 replies, has 5 voices, and was last updated by Profile photo of Jephsound Jephsound 1 year, 1 month ago.

Viewing 7 posts - 1 through 7 (of 7 total)
  • Author
  • #89642
    Profile photo of RancherAUT

    Hey Guys,

    I know, you had that already – but maybe there is fast help:

    I have the SQ5 as Monitor on Stage and a Dante Card inside for bringing Signals to FOH digitally.
    Because our FOH is not always the same, we have the SQ5 as Master, the stage setup (including) monitoring is always the same.

    Would you prefer splitting the signals via tie lines or direct out?

    TIE LINE = PrePreamp?
    DIRECT OUT = POST PREAMP, before trim? (first possibility)

    Is there a disadvantage for the FOH, if the Monitor (and Master) is sending the signals without going through the preamp? when the receiving mixer (slave) just gets the pure signal, just having TRIM for adjusting, will that affect the sound? badder?
    When using the DIRECT Out (post preamp) and changing GAIN on the Monitor (master) – will that affect the signal level arriving at the FOH (slave)?

    What about your experience?


    Profile photo of KeithJ A&H
    KeithJ A&H

    Hi Rancher,

    As with your post on virtual soundcheck, there is some confusion here about what happens where in the signal path, so hopefully I can clarify!

    There is a digitally controlled analogue preamp for each XLR socket (whether locally on the SQ or in an expander). This is where the gain, phantom power and pad ‘live’.
    After the preamp, the signal is converted to digital, and can then be sent to the SQ core, where it can be routed around, or assigned to input processing channels (at which point the following digital signal path diagrams come into play –

    So there is no ‘pre-preamp’, the signal has to be brought to line level and converted to digital before you can do anything with it. An expander ‘expands’ the console it is connected to, and the preamps in the expander are therefore controlled by this console. Any sharing of audio after this point is digital, but the signal can still be ‘trimmed’ using the digital trim in processing.

    The SQ has 48 input processing channels, but can have hundreds of input sockets. Tie Lines allow you to patch these input sockets directly to any of the hundreds of possible output sockets, but without passing through any processing.
    Direct Outs on the other hand, are tap-off points from the input processing channels, so send the signal after some or all of the processing (options shown in the linked article).

    Generally for FoH/Mon split, you would use Tie Lines. Hardware gain would be controlled by whichever console the preamps are connected to, and will affect the signal throughout the chain, but should be set correctly for the source and left alone. After which, FoH and Mon consoles can use trim to adjust their signal independently.
    A handy feature in this kind of setup is ‘Preamp On Surface’ in ‘Setup > Surface > Surface Prefs’ as when this is ‘Off’, the preamp control on the surface will always control trim, and it’s more difficult for the console controlling the preamps to make a gain change that would affect everyone! 🙂

    Hope this helps,

    Profile photo of RancherAUT

    Thank you Keith!!
    Much more light in the dark right now!!

    Profile photo of airickess

    Keith, just to clarify –
    In a FOH/MON situation using the Tie Lines feature, once the gain has been set for an input, one can go to the ‘Preamp On Surface’ feature and turn off the control of the preamp level, thus making the Gain pot control simply a trim control?

    Profile photo of MarkPAman


    Profile photo of KeithJ A&H
    KeithJ A&H

    Hi airickess,

    Exactly, so it’s probably quickest to use the gain pot on the surface for setup. Switch ‘Preamp on Surface’ OFF.
    Then if you did need to make adjustments to gain, you can still go into the preamp section of the processing screen, but the dedicated rotary will control trim.


    Profile photo of Jephsound

    Keith, in looking at this signal flow (thank you) it would shows the insert point being before the channel EQ and compressor. Doesn’t this lower the utility of the Dynamic EQ, which is an insert. Dynamic EQ and Multiband compressors, are dynamic corrective tools, so in effect you are correcting something that hasn’t been set up yet. I may be all wet in my thinking. I’m just trying to figure out the best way to utilize the great tools.

Viewing 7 posts - 1 through 7 (of 7 total)

You must be logged in to reply to this topic.