BSS Audio DPR-504 Owner's Manual - Manual (Page 20)

2 0
7.7 Range
This switch sets the difference in program signal level between its value when
the gate is open to that when it is closed, and is marked in dBs. Figure 7.3
indicates this effect.
Fig 7.3 Range control
The output program signal level when the gate is open is the same as the
input level, and is taken to be 0dB relative. When the gate is closed, the
range switch allows the program level to be set to either -20dB or -70dB of this
gate open level.
In application, when the switch is set to -20dB, the gate action will be very
much like a 'dim' function. This is ideal for use when cleaning up acoustic
microphone lines and other noisy sources during live sound reinforcement
shows. When the switch is set to -70dB, the gate action will be very much
'on-off'. This is needed in applications where signals are to be switched on
and off under dynamic control, and in studio recording environments where
electronic noise from amplifiers and keyboards need to be eliminated.
It is worth noting that the effective audible attack time will be shorter for the
-20dB range setting than for the -70dB setting, as it will take longer for the
gate to rise from a level of -70dB to 0dB, than from -20dB to 0dB for the same
fixed attack time. Figure 7.4 illustrates the point.
Fig 7.4 Effect of range
control on attack
timing
Operating Instructions