Peavey EQ 31 1/3 Octave Graphic Equalizer

Peavey EQ 31 1/3 Octave Graphic Equalizer

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Peavey EQ 31 1/3 Octave Graphic Equalizer

The EQ31FX offers 31 bands of 1/3 octave filters. LED indicators are located in the slider of the frequency bands to identify the presence of a high energy signal (usually feedback). This sophisticated feed- back 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. OR 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 per- formance 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 per- formance and be counterproductive.

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 systems 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.


    • 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
    • Filter Q: 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