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AM-55 / Sep 2015
A M - 5 5 G U I
i
AGC Controls
Gate Threshold
The i
AGC
Gate Thresh control sets the audio level at which
the iAGC gates (or stops responding to audio). The control can
be set to OFF to defeat the Gating entirely, or adjusted over
the range of ‑79.0dB to ‑20.0dB. There is also an OFF mode
that defeats the gate when it gets below ‑79.0dB.
i
AGC Attack
Determines how quickly the
i
AGC will reduce the audio
level once a change is needed. The control has a range from
2.0 seconds to 7.0 seconds.
i
AGC Release
Determines how quickly the
i
AGC increases audio once a change is needed. The
control has the same range as the attack control, 2.0 seconds to 7.0 seconds.
RTZ Enable
When active, allows the i
AGC to return to unity gain in the absence of audio. The
unity gain value is ‑12dB.
RTZ Down
Sets the time the
i
AGC takes to return to unity gain when the
i
AGC is ABOVE unity
gain (between 0 and ‑12dB of gain reduction) whenever the audio falls below the gate
threshold. The range is 2.0 ‑ 7.0 seconds.
RTZ Up
Sets the time the
i
AGC takes to return to unity gain when the
i
AGC is BELOW unity
gain (between >‑12dB) whenever the audio falls below the gate threshold. The range is
2.0 to 7.0 seconds.
Multiband Leveller Controls
AGC Drive
The AGC Drive control adjusts
the amount of signal at the input to
the i
AGC and Leveller/Compressor
which then determines the depth of
gain control achieved. Driving the
leveller harder (higher drive numbers)
results in a more consistent on air sound along with an increased ability to bring up low
passages in program material when needed. Less drive creates a more “gentle” on air
sound which then has less capability to bring up low passages. The range of this control
is ‑12.0dB to +6.0dB.
