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1431A Variable Q Active Filter 31 Band 1/3 Octave Equalizer

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The mixer also contains two auxiliary input channels for high-impedance line or tape sources. These channels have independent monitor sends, pan pots, and slide faders.

1431A Variable Q Active Filter 31 Band 1/3 Octave Equalizer

ARCHITECT'S and ENGINEER'S SPECIFICATIONS

The equalizer shall have 31 filters centered at the ISO standard 1/3-octave frequencies between 20 and 20,000 Hz. Furthermore, the filters shall provide either 6 dB or 12 dB of boost or cut and be set by 22.5 mm linear controls.
The front panel shall have the foiling controls: a gain control that is continuosly variable from - 12 dB to + 12 dB from unity gain; a high-pass filter with a slope of 18 dB per octave and a corner frequency of 43 Hz; a range switch to select either 6 dB or 12 dB of boost or cut from the filters; an EQ-on switch to put the filters in the signal path and an on/off switch.
The rear panel shall have input and output connectors, a ground-lift switch, and an IEC connector with an integral fuse holder that allows voltage selection by the way it is inserted.
The input and output of the equalizer shall be accessible via 3-pin XLR-type and 1/4-inch TRS phone jacks. The input shall be actively balanced. The output shall be balanced on the 3-pin XLR-type plug.
The equalizer shall meet or exceed the following performance specifications: frequency response at unity gain, ± I dB, 20 - 20,000 Hz at 0 dBu; a noise level of less than -85 dBu; gain of ± 6 dB or ± 12 dB; balanced-input impedance of 44 kSZ; output impedance of 120 S2; a maximum input level of + 20 dBu at unity gain; a maximum output level of 20 dBu into loads greater than or equal to 600 S2.
The equalizer shall operate on 120/240 Vac, 50/60 Hz, and consume less than 18 watts. The unit shall be operable over the temperature range as high as 50° C or 122° F. The chassis shall be steel with a gray front panel and black top, bottom, sides and back with white nomenclature. The chassis shall occupy one rack space in a standard 19-inch rack (Height: 1.73 inches, Depth: 9.24 inches, Width: 19 inches). The weight shall be 7 lbs.
The equalizer shall be the Altec Lansing model 1431A.

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