Altec Lansing Industrial Professional Sound Products Spec site

ALTEC LANSING INDUSTRIAL PROFESSIONAL SOUND PRODUCTS SIGNAL PROCESSOR LIST

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8431A & 8432A Programmable Equalizers

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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.

8431 A/8432A
Programmable Equalizers

ARCHITECT'S and ENGINEER'S SPECIFICATIONS

The equalizer shall have one (8431A) or two (8432A) channels. Each channel shall have 28 one-third octave frequency bands at the preferred ISO center frequencies between 31.5 Hz and 16 kHz and a master gain control. The gain of each frequency band shall be programmable in 1/2 dB steps from -10 dB to +10 dB. The master gain control shall be programmable from 0 dB to +10 dB. There shall be no internal or external gain controls, or other front panel controls. The equalizer shall be microprocessor-controlled and programmable only from external means.
Each channel shall have a 12 dB/octave high pass filter with software-selectable comer frequencies of 10 Hz, 32 Hz, 50 Hz, 63 Hz, 80 Hz, 100 Hz, 125 Hz, and 160 Hz. There shall also be a 12 dB/octave low pass filter (per channel) with software-selectable corner frequencies of 6 kHz, 7 kHz, 9 kHz, 11 kHz, 13 kHz, 15 kHz, 23 kHz, and 32 kHz. The inputs and outputs of the equalizer shall be electronically balanced with provisions for optional input and output isolation transformers.

Each channel shall have eight non-volatile memories, one default memory containing the actual "live" settings and seven user memories for storing additional preset equalization settings. One programmable, non-volatile, memory pointer for each channel shall be provided to permit quick changes on cue. The memory pointer shall have the capability to be disabled or "point" to one of the seven user memories.
The 8431A-PA422 and 8432A-PA422 shall have a PA-422 compatible device interface port. The 8431APA232 and 8432A-PA232 models shall have an RS-232 compatible device interface port.
The equalizer shall meet the following performance criteria: Maximum input level: + 20 dBu; Input impedance: 30 kS2; Maximum output power: +20 dBm; Output noise: <-88 dBm A-wtd. (all gains at unity); Dynamic range: >106 dB; THD: <0.01% (all gains at unity). The unit shall require one rack space (1.75 in., 4.4 cm). The unit shall operate at 100 Vac, 115 Vac or 230 Vac, 50/60 Hz.
The equalizer shall be the Altec Lansing models 8431A and 8432A.

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