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Old 11th February 2003
  #9
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You're mainly concerned with the chips used as line drivers on the console's outputs. If they use a TL072 as an output driver for the insert sends or direct outs, you're just looking at the input impedence of the device you're plugging it into. Trying to drive a 600 ohm balanced input, like a Manley Vari-Mu, from a TL072 output stage is really driving uphill.
My Trident had TL071s driving every output in stock form, which wasn't really up to the task of driving wire, let alone a low impedence balanced input. I swapped all the output drivers with B-B OPA134s, and was alot happier with the desk's headroom and clarity. HTH