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Aura8ip / Jan 2012
A u r a 8 i p P r o G U I
work is better done by the final limiter. In fact it will be obvious from our presets that all
Broadband factory presets defeat this limiter.
There are four adjustments for each limiter band:
Threshold (Band x Thresh)
This control has a range of -6dB to +6dB and sets the level at which LIMITING will
commence. At 0dB the limiter acts more as a protective device to prevent peaks from
getting above 0dB. Set to negative numbers the limiters begins to work sooner and there-
fore limits the audio to below 0dB. Set this way the limiter is not only preventing peaks,
it is also imparting its own signature on the sound. When set to positive numbers, and if
the gain structure of the processing prior to the limiters is correct, the limiter will still be
awake but will rarely, if ever, introduce gain reduction.
Limiter Attack (Lim Attack)
This controls how rapidly the limiter will act to control audio peaks. We made the
range of this control 0.3ms to 100ms however we recommend operating with settings
between 0.3 and 10ms. With settings slower than this, peak control will be sloppier and
though the multiband limiter attack setting isn’t critical, slowish attack times will make
the final peak limiter work harder.
Limiter Release (Lim Release)
This control sets how quickly the limiter recovers once a peak has passed and the
audio level falls below the limit threshold. The adjustment range of this control is 3ms
to 100ms.
Very fast release times (under 30ms and especially in the low band) coupled by very
fast attack times (under 5ms) will yield a tightly controlled audio signal that has a “ra-
dio” sound. Very slow release times (greater than 50ms) will yield a more open sound
that is still well controlled (relative to the attack time settings). As we have said with the
AGC/Compressors, unless you are very familiar with these types of controls, it’s prob-
ably best to not wander too far from the settings in the factory presets.
