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volume difference 1/4 and xlr outs


guilhordas
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The 1/4" outputs can be set to Line or Amp; this will affect the output level. There's also the difference between balanced and unbalanced outputs, though I'm not sure exactly what that translates to in terms of output levels.

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I've made these measurements and recorded the results here. The net result is:

 

All measurements were made at 1kHz with Master Volume = max, S/PDIF gain = 0dB, and Input2 = Variax (although this didn't make any difference because I had Inputs 1 & 2 panned hard Left/Right).

 

  • Guitar input pad = -5.2dB compared to normal.
  • 1/4" (line) output has 6.1dB more signal than 1/4" (amp).
  • Aux & Guitar (normal) have the same gain structure (except Guitar has the tuner and programmable input impedance).
  • Guitar (normal) input to 1/4"(amp) output has 4.9dB of loss with no FX, no Amp, and Mixer = 0dB.
  • Compared to 1/4" (amp) output, the XLR output is 9.4dB less while the phone output is 15.4dB more.
  • Compared to the Aux/Guitar(normal) input, Mic (min gain) has 6.2dB less gain while Mic (max gain) has 38dB more gain.

 

  • Aux/Guitar(normal) input clips at 0dBFS (measured at S/PDIF) with 8.3Vpp
  • Mic (min gain) input clips at -1.1dBFS (measured at S/PDIF) with 14Vpp
  • Mic (max gain) input clips at -1.1dBFS (measured at S/PDIF) with 91mVpp
  • CD/MP3 input clips at various levels near 20Vpp, depending on which output is used (XLR, 1/4", or Phones)
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The XLR outputs are designed to run at mic level, which is significantly lower than line or instrument level which is what the 1/4" outputs are designed to do.  You can definitely get a higher than mic level out of the XLR's, but that is what they are designed to do. This is according to Line 6. (I asked whether they were designed that way a long time ago)

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