Nady Systems GEQ 131LF, GEQ 231, GEQ 215LF owner manual GEQ 215/215LF

FRONT PANEL CONTROLS AND CONNECTIONS

GEQ 131/131LF

Single Channel 31 Band Graphic Equalizers

																																3		8	6	4
														7																	2				5	1
20	25	31.5	40	50	63	80	100	125	160	200	250	315	400	500	630	800	1K	1.25K	1.6K	2K	2.5K	3.15K	4K	5K	6.3K	8K	10K	12.5K	16K	20K
																														+12	10
																														+6			GEQ 131LF
																														+3
																														0	5		31 BAND GRAPHIC EQUALIZER
																														-3		40		15K	BYPASS RANGE	ON
																															15	60	7K	22K
																														-6						OFF
																														-12	10	250 3K		50K		POWER
																															0	HI PASS	LOW PASS
																															LEVEL				CLIP –6 –12
														7																	2	3		8	6	4
																																			5	1

GEQ 215/215LF

2 Channel 15 Band Graphic Equalizers

		6	4
7	2
			5

7		6	4	1
	2
			5

7	5	4	7	5	4	1
	2	6		2		6
	3A	8A		3A	8A

GEQ 231

2 Channel 31 Band Graphic Equalizer

1.Power Switch

To turn the equalizer ON or OFF, press the upper or lower portion of this button.

CAUTION: Always turn on your equalizer BEFORE your power amplifiers are turned on, and always turn off your equalizer AFTER your power amplifiers have been turned off.

2.Input Level Control

This controls the level of signal to the equalizer. It is capable of +/- 6dB of gain.

This control is used to adjust for variation in input level to the equalizer channel, or to compensate for the equalization applied to the input signal. Turn this control down if the CLIP LED illuminates steady (meaning too strong an input signal). Unity gain can be set by turning this knob to its center detent position.

3.Low-Cut/High-Pass Filter (GEQ 131/131LF/231) These equalizers are equipped with a 10Hz, 12dB/octave, variable Low Cut/High-Pass Filter (HPF) to cut down unwanted low frequency signal. Because of its high roll-off slope, the HPF can be efficiently used to attenuate the "HUM" noise from preced- ing instruments, or to prevent the low frequency resonance that can occur when speakers are installed in an enclosed acoustic environment.

3A. High-pass Filter Switch and Indicator (GEQ 215/215LF) 40 Hz, 12dB/octave HPF. LED lights when activated.

4.Filter Range Switch & Indicators

The gain range of the filter sliders is switchable (as a group) from +/-6dB to +/-12dB for maximum boost/cut capability. At 6dB the green LED will illuminate and at 12 dB the red LED will illuminate.

7	2	3	8	6	4	1
					5

5.In/Out Bypass Switch & Indicator

This switch inserts or removes the equalizer channel from the signal path. The red LED lights when the switch is depressed to indicate that the unit or channel is in the equalizing mode. In the bypass mode, the signal is routed from the input directly to the output. The bypass function is FET switched to prevent switching transients when inserting the equalizer into the circuit path. Use this switch to compare equalized and unequalized material. When there is no power to the unit, the equalizer automatically reverts to bypass.

6.Peak/Clip Indicator

This red LED illuminates if any section of the equalizer is within 5dB of clipping. Occasional blinking of this LED is acceptable, but if it remains on more than intermittently you should turn down either the equalizer’s level controls or reduce the output level of the preceding component to avoid audible distortion.

7.Filter Level Slider Controls

Each one of these linear potentiometers will boost or cut its noted frequency by either +/-6dB or +/-12dB depending on the filter range selected. When all of the sliders are in center detented position, the output of the equalizer is flat. Each slider is marked with the center frequency of its band pass filter.

8.Low-Pass/High-Cut Filter (GEQ 131/131LF/231)

This filter rolls off higher frequencies. This is useful for reducing hiss or sibilance from a signal. Its range is adjustable from 3KHz to 50KHz.from 3KHz to 50KHz.

8A. Low-Pass Filter Switch and Indicator (GEQ 215/215LF)

16KHz, 12 dB/octave LPF. LED lights when activated.

6