advice needed on long headphone cable run.

Discussion in 'Accessories / Connections' started by luts, Jan 22, 2007.

  1. luts

    luts Guest

    I will be recording shortly..
    The main control room will be about 20-30 meters from the rec studio as I want to track drums in a big room.
    I want to run headphone mixes to the band in the rec studio from the headphone amp/mixer in the Control Room (30 metres away).
    I'm planning on running a multicore between rooms to achieve this. The heaphone out jacks(in C/room) are 1/4 inch standard phono outs.
    I'm trying to figure out if I can somehow get the headphone sends down the Multicore via the return lines(4)to the stage-box in the rec studio. The inputs at the studio end will be female XLR. The outputs in the Rec Studio will be male XLR.
    I don't understand impedance very well and I'm very unsure what gear I'll need to use to get this achieved. Any advice is appreciated.
  2. Kev

    Kev Well-Known Member

    Nov 13, 2001
    gut feeling is that you shouldn't have high levels in the same multicore as you will have the Mic levels coming the other way
    especialy for recording

    if you must

    try running a balanced line cue send to the headphone amp located in the rec studio
    this may be marginaly better that unbalanced headphone levels and currents in the multicore

    multicore should be pair shielded

    can you run another multicore for the high levels
    or simple speaker leads for post HPamp
    seperate to the Mic levels
  3. Boswell

    Boswell Moderator Distinguished Member

    Apr 19, 2006
    Home Page:
    It's not really a question of impedance, but of signal levels and balancing. Ideally, you need to split the function of headphone mixing and amping/distribution. You should locate the headphone amps in the studio, fed by balanced lines from the control room. If you do this, you should not have problems in using the returns in the same screened multicore as the mic inputs. Your headphone mixer in the control room would therefore need balanced outputs at nominal line levels (+4dBu). Correspondingly, the headphone amplifiers in the studio would need balanced line-level inputs. You have XLRs on your multicore, but the headphone amps and mixer could have either XLRs or TRS 1/4 inch jacks with appropriate local patch cables.

    If you need to retain your existing gear with unbalanced outputs, don't try to put the headphone feeds down the multicore - run a separate cable between the control room and the studio. Four-pair with overall screen should be OK for this.
  4. Kev

    Kev Well-Known Member

    Nov 13, 2001
    I run light weight speaker cables as HP extenders

    7.5 amp twin core flex (round - not fig8)
    it is around the same size as a Mic cable and rolls up just as easily
    it is also used for my low powered wedges

    buy it at the hardware store and can neatly accept both soldered XLs or 6.5mm jacks
  5. RemyRAD

    RemyRAD Member

    Sep 26, 2005
    Here is the answer to your problems.

    It's fine to run your mono/stereo headphones mix, from your mixer/audio interface/auxiliary line level outputs, into your snake.

    At the box end, you will then take the 1/4" or XLR outputs from your snake and patch that into your headphone amplifier inputs, which will also require some AC from a wall outlet. This way you're not feeding extremely low impedance, high current signals up the snake, that can inductively couple, causing feedback within the snake. Only line level back fed up the snake to a headphone amplifier, would be the most appropriate way, to do what you want to do.

    Don't blow your hearing!
    Ms. Remy Ann David
  6. Kev

    Kev Well-Known Member

    Nov 13, 2001
    but I do like the HP control in the Control Room cos I don't trust the punters
    ... if they bring their own HP's
    then thay can do what they like
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