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When the control is fully counter-clockwise, the output is attenuated
by –20dB. Turning the control clockwise increases the level to a
maximum of +20dB of gain. While you can use the compressor to add
gain to a signal, it is better to add gain before the compressor for the
best signal to noise ratio. If you want to use the compressor to add
more gain, refer to the output level VU meter, or the meter on your
recorder or mixer to make sure you won't clip the next piece of
equipment in the chain.
Clip Indicator
The Clip LED is located in the equalizer circuit. It will illuminate 6dB
before the headroom of the circuit is exceeded. When this Clip
indicator lights, the level into the equalizer is too high. Turn down
either the Preamp Output control, the Compressor Output control or
the output level of the device plugged into the compressor return insert
point.
Equalizer Circuit
The equalizer circuit in the Tube Channel is a tube--based, semi-
parametric, four-band equalizer. Each of the bands overlap, giving you
the ultimate in flexibility. The "Q" (or bandwidth) of each of the filters
is purposely wide to provide a very musical sound.
Low Frequency Control
The Low Frequency control adjusts a shelving filter with a selectable
corner frequency of either 40Hz or 120Hz. The low shelving filter
affects all frequencies below the corner frequency when applying boost
or cut. In other words, cutting at 40Hz also cuts 30Hz, 20Hz, etc. The
Low Frequency control has as range of +/- 12dB. Two ranges are
selected with the Low Shift Switch: 40Hz or 120Hz. 40Hz is great for
enhancing sub-low frequencies such as those in bass guitars and kick
drums. Cutting 40Hz can also help to "clean up" mixes that sound
muddy or "loose" in the low end. 120Hz is generally the low-end for
vocals, guitars and toms. Boosting 120Hz can add "weight" or "beef"
to a week vocal and cutting it can "thin out" a signal that takes up too
much room in the low end.
Low Shift Switch
The Low Shift switch selects the corner frequency of the Low
Frequency control. In the "out" position the corner is 40Hz. In the "in"
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