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Thread: Connecting to converter

  1. #1
    Join Date
    Sep 2004
    Location
    Sacramento, CA
    Posts
    2

    Connecting to converter

    I notice some AD converters (e.g. Lucid AD9624) have only XLR connections for analog inputs. Forgive me if this is a dumb question, but can I connect the output from my Roland sound module (1/4 inch connector) to a converter with XLR inputs? Any issues with audio loss?

  2. #2
    Join Date
    Sep 2001
    Location
    Urbana, Il
    Posts
    84
    I'm not familiar with the Roland Sound Module
    however IF the 1/4" outputs are TRS...then
    make a cable to go from TRS to XLR and you're
    home free. On the other hand (and I'm thinking
    this is the case most likely) the 1/4" outputs
    are TS (tip-sleeve as opposed to tip-ring-sleeve)...then an "unbalanced to
    balanced" conversion device is required. The
    Aphex 124 is one example. Hope this helps!

  3. #3
    Join Date
    Aug 2006
    Posts
    1

    Default Impedance!!!!!!!!!!!!!!

    I think its more than just a cable difference. On synths and the like you have to check EVERY piece for the specs (cable - bal. or unbal) and what the output impedance is (-10 or +4, etc). Your goal should be +4 assuming your converters are as such.

    Impedance matching is the most overlooked detail in home or project studios. Any pro engineer will know about this.

    I almost always need to match my impedence with a quality passive DI box to get the correct signal into your converters. (Radial JDI, Countryman, etc)

    If you have a nice preamp with really good di's on it (mine is GR MP2-NV) then when you go to record/bounce that track to audio just plug it into the preamp DI instead of wherever it is going before that (patchbay?). Hopefully you don't have to scramble around the back of your AD.

    However, even with the preamp solution there are issues I've come across - my keyboards have 25 feet of cable and there just isn't enough juice in those to avoid picking up noise, hiss etc. with the weak (-10) signals they're sending out. So I patch the Radial DI right at the foot of my keyboard and then run the longer balanced cable across to the AD.

    A little late but I hope that helps.

    http://gearslutz.com/board/showthread.php?t=59843

    Here's a whole drawn out discussion in trpical fashion over there (don't say i didint warn you) BUT, if you can make it through this thread you'll be set.

  4. #4
    Join Date
    Sep 2001
    Location
    Urbana, Il
    Posts
    84

    Default

    +4 and -10 ARE NOT Impedances, these are signal levels expressed in volts.
    Matching them is important. Impedances are expressed as hi-z, low-z, or
    generally the value is expressed in ohms. It is possible to have a +4 signal
    that is hi or low z and the same for a -10 signal. Just being a nitpicker here
    so as to avoid confusion.

  5. #5
    Join Date
    Sep 2001
    Location
    Urbana, Il
    Posts
    84

    Default

    slight correction on my last...+4 and -10 are signal levels expressed (yes in
    volts) but as decibels with various references like the old phone company
    reference of dBm, and the newer more commonly used versions of dBV etc.

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