Level Control - Art HD 131 User Manual

Clip Indicator: - This red LED illuminates if any section of the equalizer is near clipping. Oc-
casional 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, turn down
the equalizer's level control to avoid audible distortion.
5. HI PASS FILTER (LOW-CUT FREQUENCY CONTROL)
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 in-
stalled in an enclosed acoustic environment. It is also very effective at removing power robbing and
potentially destructive rumble.
6. LOW PASS FILTER (HIGH-CUT FREQUENCY CONTROL)
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 fre-
quency noise from preceding instruments, or roll-off excessive high frequency sounds to obtain a
more natural sound in some acoustic situations.

7. LEVEL CONTROL

This controls the output signal level from the equalizer. Turn this control down if the Clip LED illumi-
nates 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 by-
passed, should be the same (or a little lower) than when active. One reason for this is if the equalizer
loses power (which causes the unit to go into bypass), the signal will be equal or lower than the active
eq gain. This will ensure that a signal with undesirably higher levels will not be passed inadvertently.
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