ART Pro Audio EQ341 - Dual 15 band EQ - Manual (Page 8)

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HI PASS FILTER (LOW-CUT FREQUENCY CONTROL) (EQ351 and EQ355 only)
To cut down on unwanted low frequency signals, this control determines the roll-off frequency of the
Hi-Pass Filter (HPF). The roll-off frequency can be adjusted from 10Hz to 250Hz by turning this
knob.
Because of its high roll-off slope, the HPF can be efficiently used to cut down hum and low frequency
noise from preceding instruments, or to reduce low frequency resonances, when speakers are
installed in an enclosed acoustic environment. It is also very effective at removing power robbing and
potentially destructive rumble.
LOW PASS FILTER (HIGH-CUT FREQUENCY CONTROL) (EQ351 and EQ355 only)
To cut down on unwanted high frequency signals, this control determines the roll-off frequency of the
Low-Pass Filter (LPF). The roll-off frequency can be adjusted from 3kHz to 40kHz by turning the
knob. Because of its high roll-off slope, the LPF can be effectively used to cut down the high
frequency noise from preceding instruments, or roll-off excessive high frequency sounds to obtain a
more natural sound in some acoustic situations.
LEVEL CONTROL
This controls the output signal level from the equalizer. Turn this control down if the CLIP LED
illuminates steadily (meaning too strong an input signal). Unity gain can be set by adjusting this knob
so that as you toggle the BYPASS switch the overall level sounds the same.
Signal levels should be kept normalized through the equalizer. That is, the signal level, when
bypassed, should be the same (or a little lower) than when active.