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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, use the
VU meter to monitor the Pro Channel's output level, or use 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 red Clip LED, located between the compressor and EQ sections, monitors the EQ's
level at several internal points. It will illuminate 6dB before the available headroom is
exceeded. When the 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 Comp In insert point.
Equalizer Circuit
The equalizer circuit in the
Pro Channel is a tube-based,
semi-parametric, four-band
equalizer. All of the bands
overlap, giving you the
ultimate in flexibility. The
normal bandwidth of each
filter is purposely wide to
provide a very musical
sound.
Low Control
The Low control adjusts a
shelving filter with a
selectable corner frequency
of either 40Hz or 120Hz.
The two frequencies are selected with the Low switch (see below). 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 control has as range of
±12dB.
Low Switch
The Low switch selects the corner frequency of the Low control. In the "out" position,
the corner is at 40Hz. In the "in" position, the corner is at 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
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