The easiest way to set the threshold control is to start with the con-
trol fully clockwise. After setting the Gain control, slowly turn the
Threshold control counter-clockwise (lowering threshold) until you
see the yellow (0dB) Threshold LED light. Now adjust the control
(either lower or higher) until you have the amount of compression
you desire. Use the Gain Reduction meter as a visual guide to the
amount of compression applied.
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In its “out” position, the Tube PAC’s compression ratio is an active
2.3:1 ratio. This means that for every 2.3dB over the threshold the
input signal rises, the compressor’s output will change by 1dB.
This is a very mild and musical compression ratio which is ideal
for smoothing all types of signals.
In its “in” position, the compression ratio is greater than 6:1. This
is typically called “soft limiting” as it allows only a 1dB change in
signal level for any signal reaching over 6dB over the set thresh-
old. This setting is ideal for applications where exceeding a set
level is not desirable (mixing, popping bass, digital recording,
etc.).
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The position of the Speed switch selects the release characteristics
of the Tube PAC’s compressor. The “out” position allows the com-
pressor to recover quickly once the signal falls below the thresh-
old. The “in” position allows the compressor to adjust itself
depending on the characteristics of the input signal. Use the “fast”
setting when the signal has repetitive, consistent characteristics
(kick drum, snare, vocals, etc.). Use the “auto” setting when the
signal has varying characteristics (long decaying notes alternating
with quick notes, mix material, etc.).
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The Phase switch is provided to reverse the phase of a signal. This
switch works on Pins 2 and 3 of the XLR Output jack. The Phase
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