p.137
output limiter functions
The X-VCA provides output limiters inserted in the main output circuits following the L/R
Stereo and Mono master faders.These limiters function with an RMS characteristic,and will
therefore pass short term program peaks without attenuation or audible signal degradation.
The X-VCA output limiters are best used for system protection,or to aid the operator in
keeping within maximum sound levels as set by local noise ordinances.
To set the output limiters:
1.Turn the limiter function on- Press the LIMIT ON button to activate the lim-
iter function.Note that the limiter function affects the respective main outputs only.
The Alternate,Monitor and Assisted Listening outputs are not affected by the lim-
iters.
2.Set the output limiter threshold - Set the control to the input signal level at
which limiting function is desired.Input signal above the threshold will cause a lev-
eling of the output signal at a ratio of greater than 20:1.Initial onset of limiting is a
modified rapid soft-knee characteristic before hard limiting occurs. The threshold
control may be set for onset of limiting at any output level between -6dBu and
+20dBu.
The eight segment ATT output meter displays effect of output limiting.The top seg-
ment indicates limiter function is ON. The remaining seven segments indicate
amount of signal attenuation when master bus signal exceeds the set threshold.
Note:Caution should be exercised if the output ATT meter shows constant atten-
uation, or significant attenuation at frequent intervals. This could indicate some
deterioration of the output signal quality.
Note: EXTREME caution should be observed when turning the limiter function
off. If the limiter is currently attenuating the output, removing the limiter from the
circuit could result in a sudden increase in output signal with possible damage to
speakers.
9
dynamics control