Specifications

Audio Plug-Ins Guide88
Impact Gain Reduction Meter
The Gain Reduction meter is an analog-style
meter that indicates the amount of gain reduc-
tion in dB. The range of this meter is from 0 dB
to 40 dB. The gain reduction meter displays the
amount of gain reduction linearly from 0–20 db,
and non-linearly from 20–40 dB.
Impact Meters
The Input/Output meters indicate input and
output signal levels in dB. When Impact is used
in mono or stereo, both input and output meters
are displayed. When Impact is used in a multi-
channel format, only output meters are dis-
played by default. You can toggle the meter dis-
play to show only input meters by clicking the
blue-green rectangle at the lower right of the
meter display.
A red clip indicator appears at the top of each
meter. Clicking a clip indicator clears it. Alt-
clicking (Windows) or Option-clicking (Mac)
clears the clip indicators on all channels.
Using the Impact
Compressor
Compressors reduce the dynamic range of audio
signals that exceed a user-selectable threshold
by a specific amount. This is accomplished by
reducing output levels as input levels increase
above the threshold.
The amount of output level reduction that Im-
pact applies as input levels increase is referred
to as the compression ratio. This parameter is ad-
justable in discrete increments. If you set the
compression ratio to 2 (a ratio of 2:1), for each
2 dB that the signal exceeds the threshold, the
output will increase only by 1 dB. With a setting
of 4 (a ratio of 4:1), an 8 dB increase in input
will produce only a 2 dB increase in output.
Gain Reduction meter
Toggling the meter display in the Output meters
(5.1 surround format shown)
Clip indicator in Input/Output meters (mono shown)
Input/Output meters (stereo shown)