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What's goin' on here.......!?!?!?!?

Discussion in 'Recording' started by OTRjkl, Feb 26, 2003.

  1. OTRjkl

    OTRjkl Guest

    This is a live sound situation, but the same principles apply....

    Hooked up a brand spankin' new - right outta the box - Allen & Heath GL2200 this evening. Ran the mixer output to the mains from the Mono out (XLR) of the board into the XLR input of a dbx266 (compressor) set at +4dbu and then fed the output of that into a return line down the snake and into the power amp input (XLR > 1/4" unbal - pins 2&3 tied together at 1/4" end).

    Signal was weak - VERY WEAK!!! Took the comp out of the loop by hooking the snake return line directly to the mixer Mono out (and also tried hooking to the XLR cable plugged into the Mono out) and the signal came to life. The difference is about 180 degrees on the Mono send level pot to get the same volume - really :eek: - and, there is some distortion there too with the comp in-line.

    OK - that makes absolutely no sense me whatsoever.

    I first had tried running thru a graphic which was 1/4", and it did the same thing so I thought something was up with the EQ (bal vs. unbal, etc.). But then I had the same deal with the compressor - so now I'm scratching my head.... :confused:

    The output level of the comp & the EQ were set to '0' (unity). I even tried using the 1/4" (bal) I/O of the dbx - no change....and bypassing the comp or EQ makes no difference. The comp has a switch for +4 or -10. Only difference is that when set to -10, the signal practically goes away.

    Anybody see what I'm overlooking?

    Thanks for the help.
  2. Kurt Foster

    Kurt Foster Distinguished Member

    Jul 2, 2002
    77 Sunset Lane.
    Check the owners manuals and make sure that both pieces of gear (Allen Heath & DBX) are pin compatible... meaning pin 2 hot pin 3 cold or vice versa. Some gear, especially from the "other side of the pond" is pin 2 cold, pin 3 hot. Rane gear is like this also. ..... Fats
  3. RecorderMan

    RecorderMan Distinguished Member

    Mar 28, 2001
    You can't tie Pins 2&3 together.

    Go to their Web site
    (or the manual) and you will find out this:
    "...To connect a balanced console output to an unbalanced destination link the cold output to 0V earth at the console."

    Pin1 =Ov earth shield
    Pin2 = +/ hot signal
    Pin3 = -/cold

    1/4 TRS jack's
    Tip = +/ hot signal/left/send
    Ring = -/cold/Ovu/return
    Sleeve = OV earth sheild

    ....In other words...make yourself a barrel or short XLR cable for the that ties Pin 3 & Pin 1 together.
    NEVER TIE PINS 2 & 3 TOGETHER to unbalance a balaced line. It's going to be either Pin 3 & Pin 1 together, or Pin 2 & Pin 1 together.
  4. Davedog

    Davedog Distinguished Member

    Dec 10, 2001
    Pacific NW
    aaahhhh...beat me to it.....when i first read it i thought it was gonna be the +4/-10 on the comp,but then i saw thw the pin2 pin3....no no...the english are very particular about the earth
  5. OTRjkl

    OTRjkl Guest

    OK -

    I did check the manuals when I suspected the pin 2 hot issue....the 2200 is pin 2 hot - so is the dbx 266.

    I'm trying to remember about the cable from the snake to the amp. I must have tied pins 1&3 together since everything works normally when I plug the snake return directly into the console Mono out (XLR). So, my statement about tying pins 2&3 together was in error - hey, it was late after a long day... (I will check that just to be sure.)

    Any more ideas...?
  6. Davedog

    Davedog Distinguished Member

    Dec 10, 2001
    Pacific NW
    Dead 266? its gotta be something right there if it works without the 266 in the line...uhh, did you turn it on? sorry......i figured if i still do crap like that after 30 years someone else can do it too.
  7. OTRjkl

    OTRjkl Guest

    I can't believe it...!! You must be the only one... :confused:

    You know its gotta be something simple....
  8. Sounds like something on the snake's return end to me .. also try the dbx and/or EQ at the other end of the hookup just before the amp. Also, what amp, and what's the config on it?
    Lastly, is it possible that the mono out is out of phase? Try a line or aux out signal to check what it does against that mono xlr ....
  9. OTRjkl

    OTRjkl Guest

    Got the EQ problem fixed yesterday -

    Still ran out of the Main Mono out but I used an XLR ---> 1/4" unbal transformer at the input of the EQ and a 1/4" unbal ---> XLR transformer at the output. Everything works as is supposed to.

    As far as the comp. - I'm going to use it on channel inserts so I'm betting that it will work just fine. We'll see.....

    Thanks for the help.

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