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GEQ-1231D/GEQ-2231D 31-Band Graphic Equalizer/Limiter
rumbles and wind noise, while leaving other frequencies unaffected. When the
filter is activated the associated LED lights. Rotating the knob to the Off position
removes the filter completely from the signal path.
The GEQ-1231D has only one low-cut filter control for both channels, while the
GEQ-2231D provides independent controls for each channel.
9. High-Cut Filter Frequency Control
This knob controls the range of the high-cut filter, from approximately 3.3kHz to
29.5kHz. The filter is designed to aid in cutting unwanted high frequencies, such as
hiss and noise from other equipment, while leaving other frequencies unaffected.
When the filter is activated the associated LED lights. Rotating the knob to the Off
position removes the filter completely from the signal path.
The GEQ-1231D has only one high-cut filter control for both channels, while the
GEQ-2231D provides independent controls for each channel.
10. Limiter (Threshold) Control
This knob controls the Threshold level of the integrated peak limiter circuitry. The
GEQ-1231D/2231D is equipped with a state-of-the-art digital peak limiter, utilizing
look-ahead circuitry, soft clipping function and automatic, source-dependent
attack and release time calculation to maximize its effectiveness in critical
dynamic usage.
The Threshold level can be set within a range of 0dB to +19dB, referenced to the
output level. When the signal peak exceeds the threshold, the gain will be
decreased to avoid overload and clipping. Rotating the Threshold level to the
extreme right position will switch off the limiter circuitry.
A soft-clipping function is provided after the limiter circuitry, providing a much
smoother limiting function more closely resembling an analog limiter. It is
activated when very sharp (usually non-audio) transients such as clicks and spikes
appear at the unit’s inputs. Its operation is indicated by the Out Clip LED (12).
The GEQ-2213D is equipped with two independent Threshold controls, while the
GEQ-1231D utilizes a single control for both channels.
11. Gain Reduction Meter
The Gain Reduction Meter monitors the activity of the limiter, displaying the
degree of attenuation. For best performance do not allow reduction to exceed –
3dB.
12. Out Clip Indicator
This LED lights when the output signal has reached the soft clipping threshold
beginning at –1dB, typically corresponding to 19dBu on the analog outputs. While
occasional flashing of this indicator is acceptable, frequent or steady lighting
indicates clipping, in which case it is advisable to lower the input gain or raise the
limiter threshold.
13. Power Switch
This switch is used to switch the unit on and off. When the unit is on, the integrated
Power Indicator LED is lit.
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