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Is there an impedance changing device?

Discussion in 'Recording' started by lena, May 10, 2008.

  1. lena

    lena Guest

    some kinda gizmo which will will reduce the impedance of a jack i wanna whack into my firepod from line to instrument level?- ¿huh?- ¿is there?
     
  2. Kev

    Kev Well-Known Member

    audio transformer
    DI box

    what is the problem ?
    what are the units ?

    explain exactly what you want to set up
     
  3. lena

    lena Guest

    ok- ive put 12 mics into my old dynamix 3000 24×16 mixing desk- & im routing that into my firepod- prob is the firepods 1st 2 inputs are instrument not line- sowhich means i have to reduce my 12 to 6 instead of 8
     
  4. Kev

    Kev Well-Known Member

    my first suggestion would be to plug 12 mic straight into the Firepod

    however it's obvious that you want to use the dynamix and it's facilities like EQ and routing and it probably sets up the headphone cue mix

    it can also sub mix

    Generally mic into the Dynamix and direct outs and sub mix out into the Firepod

    channels 1 and 2 are Mic or Instrument
    channels 3 to 8 are Mic or Line

    So
    get two DI boxes that can handle Line level and connect this to the direct outs or submix outs of the Dynamix.
    Set for Line input.
    this will balance and PAD back a line level signal to a Mic level signal and this is usable into Mics 1 and 2 of the Firepod

    Firepod 1 and 2 should probably be considerred as the last two inputs and used only when needed
    UNLESS
    you actually like the sound of the DI into the Firepod Mic ... which is possible.
    I often record synths in this way

    A variety of DI boxes could be ok
    passive or active

    some passive ideas
    http://www.jensen-transformers.com/apps_sc.html

    standard styled DI box
    http://www.jensen-transformers.com/as/as007.pdf
    it shows the output PAD option and when it would fit in the signal chain

    this one is a typical intrument DI and not quite suitable for this app
    http://www.jensen-transformers.com/as/as066.pdf

    these will both look very similar from the outside and use the same Transformer
    so you need to be aware of what they are designed to do.

    I have some transformers that will work here without any other components
    similar to this
    http://www.jensen-transformers.com/as/as052.pdf

    Do you know the spec for the line outputs of the Dynamix ?
    I'm guessing, unbalanced at around 0dBu to +4dBu and could be low imp output of around 600 ohms
    so
    you want a DI that can handle this level without saturating or clipping then provide a balanced Mic level for the firepod.

    this should be an easy find
     
  5. Crankitup

    Crankitup Guest

    actually the firepod has two line inputs on the back for channels 1 and 2
     
  6. Kev

    Kev Well-Known Member

    thanks Crank

    didn't see that on the picture I saw on the net

    so now I don't see the problem
    apart from fitting 12 into 8

    ?
    on the web site now
    the FP10 seems to be the replacement for the Firepod
    it does't say that 1 and 2 can be line level

    however 1 and 2 do have fully balanced send and return

    the returns can be used as Line Inputs

    which unit do you have and what are the features on the back panel ?
     
  7. lena

    lena Guest

    thanks kev & crankitup- i just woke up this am & had a look at the back of the firepod & found the 2 line inputs- so everything scoo now- ta
     
  8. lena

    lena Guest

    i forgot to say doh & slap my forehead

    doh

    slap
     
  9. Kev

    Kev Well-Known Member

    yep
    :)
    cool
    " doh "
    you get that

    do have a look at the DI box as it could be a useful addition to the tool box
     

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