ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer
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BYPASS SWITCH
When the red Bypass LED is illuminated, this indicates that the unit or channel is in the
bypass mode. Signal is routed directly from the input to the output without passing
through any circuitry (often referred to as ”hard-wire bypass”). Use this switch to
compare equalized and unequalized material, or to bypass the EQ section in the
unlikely event of total unit failure.
LEVEL BARS AND CLIP INDICATOR LED
Clip Indicator
This red LED illuminates if any section of the equalizer is near clipping. Occasional
flickering of this LED is acceptable, but if it remains on more than intermittently you
should reduce the output level of the preceding equipment, or if that is not possible,
reduce the amount of boost in the equalizer filter bands. Reducing output level will not
prevent clipping of the equalizer circuitry.
Level Bars
The 10 segment Level Bars provide an easy to read indication of signal levels at the
output of the equalizer. The Level Bars also provide a peak hold function. This allows
viewing both the peak level as well as the average signal level in a glance. Peak level is
especially important when driving power amplifiers or A-D converters which tend to clip
hard. The peak level indicator helps to set level in a manner that will avoid this harsh
clipping.
LOW-CUT FILTER FREQUENCY CONTROL
To cut down on unwanted low frequency signals, this control determines the roll-off
frequency of the Low Cut Filter. The roll-off frequency can be adjusted from below 10Hz
to 250Hz by turning this knob. Because of its high roll-off slope, the filter can be
efficiently used to cut down hum and low frequency noise from preceding devices, or to
reduce low frequency resonance when speakers are installed in an enclosed acoustic
environment. It is also very effective at removing power robbing and potentially
destructive rumble.
HI AND LO TRIM CONTROLS
These unique controls allow a gentle slope to be added, or, subtracted from the overall
frequency response. Both controls hinge at the middle of the spectrum and provide
subtle changes to the overall sound without the need to adjust many sliders. Although
similar in concept to tone controls, these differ in their well controlled precision straight
Summary of Contents for XL 231
Page 1: ...OPERATION MANUAL ...
