Adjusting Playback Volume; Nominal Levels - Echo AUDIOFIRE 2 Owner's Manual

Adjusting Playback Volume

Output volume adjustments are made in the digital domain. When you lower a
volume fader below 0dB, you are actually decreasing the number of available bits,
thereby taking away from the potential dynamic range of the system. Therefore,
we suggest that whenever possible you leave the output faders (Playback & Output
Bus) set to 0dB, and perform any necessary attenuation on your external mixer.
When the playback volume controls are set to 0dB and the input signal approaches
the maximum pre-clipping level, you can achieve the full 24-bit dynamic range of
the system.

Nominal Levels

The console buttons that are labeled "+4" or "-10" are nominal level buttons.
These buttons allow you to change the nominal level settings for the analog inputs
and outputs. By default, the levels are set to send a +4dBu signal. You can switch
between +4dBu (professional level) and –10dBV (consumer level) for each analog
output and input by clicking on the appropriate button. This feature allows you to
connect either professional or consumer gear to each input and output.
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