Post-matrix Gain and Mono Sum

An output channel POST GAIN block provides gain control, mute control, and the ability to sum the stereo signal to mono.

See the Optimizing Audio Levels section for more information.

Adjusting Post-matrix Gain

Each output channel POST GAIN block opens a Post-matrix Gain dialog that provides left-channel and
right-channel long-throw (large) faders with a gain range of -100 dB to +12 dB. Level setting text fields are located below the faders. The default setting is unmuted at unity gain (0.0 dB).

The Gang button couples the left-channel and right-channel faders. Ganged faders move together at relative levels to the top or bottom. If one fader reaches the maximum value of the gain range, it retains that position while the other fader continues to move. When you adjust one of the faders in the reverse direction, the other fader reverts to its relative position. The Gang button is shaded green when the two faders are ganged.

To mute the signal individually to the left or right stereo bus, click the associated Mute button. The Mute button is shaded red when the signal is muted.

To adjust the fader level:

  1. Click the fader handle or click within the fader area.

  2. Adjust the level using any of the following methods:

  3. Click and hold the fader handle, then drag it to the desired level in 0.1 dB increments.

  4. Press the <Up arrow> or <Down arrow> key to respectively increase or decrease the level in 1 dB increments.

  5. Press the <Page Up> or <Page Down> key to respectively increase or decrease the level in 10 dB increments.

  6. Click in the level text field (resolution is
    0.1 dB increments) and enter a new value. Then, press <Enter> or press <Tab> to move to another area of the dialog.

  1. Click OK to accept the changes and close the dialog. Click Cancel to close the dialog without saving any changes.

Stereo-to-Mono Summing

A stereo signal can be summed to mono. The sum point in the signal chain is after the switcher matrix and before the post-matrix gain.

In the Post-matrix Gain dialog, select the Enable Mono Summing check box to enable stereo-to-mono summing. Clear the check box to disable the stereo-to-mono summing. When mono summing is engaged, the name of the POST GAIN block changes to the MONO SUM block to indicate this status.

When summing is enabled, the stereo signal is summed, then split to dual mono paths. Mono levels can then be adjusted independently, allowing for two separate microphone mixes to the left and right outputs. When a left and right stereo signal is summed, you should expect a 6 dB gain in level from each output.