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AM-55 / Sep 2015
A M - 5 5 G U I
Gate Delay
Delays the gate activation by a user
defined amount of time once audio has
fallen below the gate threshold. The range
is 50‑500ms.
Leveller Gate Mode
There are two different modes available for tailoring the behavior of the Leveller Gate
during periods of silence or low audio levels when the audio is below the currently set
Gate Threshold.
When Ooze is selected and the audio input falls below the Leveller Gate Threshold,
rather than the bands “holding” their current gains, their gains will slowly increase towards
0dB. The Ooze setting is useful for formats playing material with very wide dynamic
range or for certain speech‑based formats.
When Hold is selected and the audio falls below the Leveller Gate Threshold the gains
of the five bands will “freeze” at their current values. Their gains will hold at those values
until audio is above the Leveller Gate Threshold again. The Hold mode prevents the
Leveller from increasing its gain in the absence of audio which minimizes the increase of
background noise.
Leveller Gate Threshold
The Leveller Gate Thresh control sets the audio level for when the Leveller enters one
of the Gated modes explained above. The control can be set to OFF to defeat the Gating
entirely, or adjusted over the range of ‑79.0dB to ‑20.0dB.
Crossover Frequencies
The Leveller/Compressor is a five band design utilizing phase linear
Linkwitz‑Riley crossover filters. Careful filter design eliminates un
‑
natural spectral coloration when deep gain reduction is occurring in
one or a few bands.
Crossover Frequency Options:
Band 1 to Band 2 – 50, 70, 90, 110, 130 Hz
Band 2 to Band 3 – 220, 300, 380, 460, 540 Hz
Band 3 to Band 4 – 800, 1200, 1600, 2000, 2400 Hz
Band 4 to Band 5 – 3500, 4500, 5500, 6500, 7500 Hz
Band Coupling (Inter-band Coupling) and Key Band
Each band of Leveller and Compression can be offset from its
neighbor by using the coupling controls. You can also select which
band can be the key or master band.
Each Band Coupling
control may be adjusted over the range of
“0dB” to “‑6dB.” When all the coupling controls are set to “0dB”,
only Band 2 can take on more gain than Band 3 (if Band 2 is the
key band). All of the other bands will remain “flat”. If Band 3 is
the key band, it can take on more gain than Band 4 while all other
bands remain “flat”. Such a setting is useful in formats such as
Classical and Jazz that typically would not enjoy the automatic
spectral balance “correction” that more processed formats usually
prefer.
