PEAVEY EQ 31FX User Manual
EQ™ 31FX
31 Band Professional Graphic Equalizer
Ow n e r ’s Ma n u a l
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enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
Intended to alert the user of the presence of important operating and maintenance (servicing)
instructions in the literature accompanying the product.
CAUTION: Risk of electrical shock — DO NOT OPEN!
CAUTION: To reduce the risk of electric shock, do not remove cover. No user serviceable parts inside. Refer
servicing to qualified service personnel.
WARNING: To prevent electrical shock or fire hazard, do not expose this appliance to rain or moisture. Before
using this appliance, read the operating guide for further warnings.
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pueda reparar. Deje todo mantenimiento a los técnicos calificados.
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warnen, die von Ausreichender Stärke sind, um einen elektrischen Schlag verursachen zu können.
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Fachpersonal durchführen lassen.
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ENGLISH
Congratulations on purchasing the EQ™ 31FX! With its introduction, Peavey engineers have
taken graphic equalizers to the next level. The EQ™ 31FX offers 31 bands of 1/3 octave filters
featuring superior constant “Q” devices. LED indicators are located in the slider of the frequency
bands to identify the presence of a high energy signal (usually feedback). This sophisticated feedback detector system will allow you to quickly identify and remove feedback. It works like this: When
the feedback detection circuit detects the frequency band with the most energy, it causes the LED in
the slider of the associated frequency band to illuminate. By moving the fader downward for that
band, the likelihood of feedback is reduced/eliminated. Most use the EQ 31FX in one of two ways:
1. To catch and reduce/eliminate feedback “on-the-fly” during a performance. 2. To determine
frequency bands that are susceptible to feedback BEFORE the performance, and eliminating them
in advance.
After the system is set up, bring up the microphone levels slowly. As they start to feed back,
note the LED activity on the EQ 31FX feedback bands. Move the faders to decrease the “identified”
bands. Now you have eliminated a high percentage of potential feedback problems, before the performance even begins! Note: It is not uncommon for feedback to be active over several frequency
bands. Also, go easy when making fader adjustments since extreme movements will affect your performance and be counterproductive.
OPERATION NOTE
This equalizer is designed to provide room equalization, feedback control and system tone
control. No amount of equalization will correct an acoustically bad room/mic/speaker arrangement or
completely correct the response of a poor loudspeaker. Always begin with all sliders in the “0”
position and avoid excessively cutting large segments of the audio passband, which would limit the
system’s dynamic range. Exercise caution when attempting to boost equalization below cut-off of the
speaker system. Typical sound reinforcement enclosures are not designed for 20 Hz performance
and transducer damage could result.
FRONT PANEL
4 5 6
1
2
7
3
8
9
FRONT PANEL FEATURES:
BYPASS SWITCH (1)
In Bypass mode (switch in), the input signal is routed directly to the output and is unaffected by all
front panel controls except the low and high cut filters.
BYPASS LED (2)
This LED will illuminate when the Bypass switch is in the “in” position, indicating that the EQ and
3
gain controls are bypassed.
LOW CUT (3)
A high pass filter, continuously variable from 5 Hz to 200 Hz. Low frequency roll-off is at 12 dB per
octave. Adjust this control to approximate low frequency cut-off of speaker system.
HIGH CUT (4)
A low pass filter, continuously variable from 5 kHz to 35 kHz. High frequency roll-off is at 12 dB per
octave. Adjust this control slightly above high frequency system limitation.
LED LEVEL METER (5)
This multicolored LED ladder indicates output level.
GAIN (6)
Calibrated control for regulating overall gain of the equalizer section. Unity gain throughout the
signal chain may be maintained by recovering lost signal at this point. Example: Assume the
equalization process has introduced a signal loss of -6 dB by negative (-) adjustment of the EQ
section. The gain should then be adjusted to +6 to maintain unity gain through the equalizer.
EQUALIZER SECTION (7)
31 bands of 1/3 octave filters. The filters are constant “Q” devices, located at ISO center
frequencies. Effective equalization range is from 20 Hz to 20 kHz. Maximum cut or boost per
frequency is 15 dB.
AUTOMATIC FEEDBACK LOCATING LEDs (8)
When feedback occurs, the LED of the frequency band that is feeding back will illuminate indicating
feedback in that band. The LED will remain illuminated for a few seconds even after the feedback is
gone. This is to allow you to see where the feedback is if the feedback goes away before any
correction is made. If there is no feedback occurring, the LED of the frequency band with the most
energy in it will illuminate. Just because the LED is illuminated does not mean that there is feedback
occurring. For best performance of the automatic feedback locating system, use an input signal of
0 dB (1V RMS).
POWER SWITCH (9)
REAR PANEL
5
Used to turn AC mains power on or off.
INPUT XLR (1)
2
4 3
4
1
A three-pin female XLR jack is provided for electronically balanced input termination (pin 2
EQ 31FX Application:
Mono send from Mixer to external
EQ/Power Amp combination.
EQ 31FX
Balanced Input
Balanced Input CH 2 CS800S Balanced Input CH 1
EQ 31FX Balanced Output
Parallel Patch
Balanced Input CH 2
Power Amp
Out CH 2
Power Amp
Out CH 1
Main Balanced Output
positive, pin 3 negative).
INPUT 1/4" (2)
1/4" tip-ring-sleeve (stereo) jack provides balanced input when used with stereo (TRS) 1/4" plugs
and 2-conductor shielded cables. When used with a mono 1/4" phone plug, the input is unbalanced.
OUTPUT XLR (3)
A transformer balanced, male XLR output provides line-balancing to other pieces of audio
equipment (power amps, etc.) Balanced output is recommended for rejection of hum, noise and
outside interference (pin 2 positive, pin 3 negative).
OUTPUT 1/4" (4)
1/4" phone jack is provided for unbalanced output termination.
LINE CORD (120V Products only) (5)
We have incorporated a 2-wire line (mains) cable for power on the EQ 31FX.
Power requirements:
Domestic: 120VAC / 60 Hz / 20 W.
Export: 230VAC / 50/60 Hz / 20 W.
NOTE: CAUTION: TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SLOT,
™
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SPECIFICATIONS
Frequency Response:
+/- 1 dB 20 Hz to 20 kHz
Distortion:
.005% 20 Hz-20 kHz
Input Impedance:
Balanced 20 k Ohms (Equal impedance to
ground)
Output Impedance:
330 Ohms
Maximum Input Level:
+21 dBu (8.6 V RMS)
Maximum Output Level:
+27 dBu (17 V RMS)
Nominal Input Level:
0 dBV (1 V RMS)
Nominal Output Level:
0 dBV (1 V RMS)
Input Headroom:
Nominal 21 dBu
Output Headroom:
27 dBu
Output Noise:
EQ in bypass: -101 dBV
EQ in, all flat: -95 dBV
Filter Frequencies:
20, 25, 32, 40, 50, 63, 80, 100, 125, 160,
200, 250, 315, 400, 500, 630, 800, 1 k,
1.25 k, 1.6 k, 2 k, 2.5 k, 3.15 k, 4 k, 5 k,
6.3 k, 8 k, 10 k, 12.5 k, 16 k, and 20 kHz
4.77
Maximum Boost and Cut Filter:
+/- 15 dB
Maximum Boost and Cut Gain (WideBand
Gain):
+/- 15 dB
Low Cut Filter:
12 dB Per Octave
Frequency:
Min: 5 Hz
Max: 200 Hz
High Cut Filter:
12 dB Per Octave
Frequency:
Min: 5 kHz
Max: 35 kHz
All specifications are typical unless otherwise
noted. 0 dBV=1 Volt. All specifications are
referenced to nominal output level (0 dBV)
unless otherwise stated. All measurements are
wideband 20 Hz to 20 kHz unless otherwise
stated. NOTE: All specs measured at 1V RMS
input and unbalanced output. All sliders at
mid position, all switches out unless otherwise
noted. Due to our efforts for constant
improvement, features and specifications
listed herein are subject to change without
notice.
Filter Q:
6
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