8431 A/8432A
Programmable Equalizers

KEY SPECIFICATIONS
Frequency Response: 20 Hz 20 kHz, ±1 dB
(with HPF and LPF at 10 Hz and 32 kHz respectively).

% (Total Harmonic Distortion + Noise): < 0.01% (at unity gain from 20 Hz to 20 kHz).

Noise Floor: < -88 dBm (A-weighted at unity gain, HPF and LPF at 10 Hz and 32 kHz respectively).

< -86 dBm
(22 Hz to 22 kHz at unity gain, HPF and LPF at 10 Hz and 32 kHz respectively).

Dynamic Range: > 106 dB.

Input Circuitry:
Type: Electronically-balanced.
Impedance: 30 kQ balanced or unbalanced.
Nominal level: 0 dBu (0.775 vrms).
Maximum level: +20 dBu.

Output Circuitry:
Type: Electronically-balanced.
Source impedance: 5052.
Min. load impedance: 60052.
Nominal power: 0 dBm (0.775 vrms across
600Q load).
Maximum power: +20 dBm.

DESCRIPTION

The Altec Lansing models 8431A/8432A are 28 band, one-third octave programmable equalizers. The 8431A is a single channel and the 8432A offers two independent channels. Two versions of each unit are offered. The -PA232 version uses the standard RS-232 protocol and may be connected to an RS-232 port without external adapters. The -PA422 version conforms to the standard PA-422 communications protocol, allows for longer control cable runs, and is useable with other PA-422 compatible products.
The equalizers are programmed using AcoustaGRAPHICS"', a menu-driven software program. This software, along with the unique packaging of the units, makes these equalizers ideal for situations which require tamper-proof, compact and reliable equalization.
The unit allows 0-10 dB of boost/cut per band in 1/2 dB steps, and a master gain control offering 0-10 dB in 1/2 dB steps. Each channel has seven nonvolatile memory locations and one active memory. High and low pass filters offer programmable corner frequencies for each channel. A Remote Memory Select switch (per channel) allows for external closures to reprogram the equalizer from a preset memory. An EQ Bypass switch allows the user to easily remove the signal from a processed channel.
There are two optional plug-in isolation transformers available: the 15550A input transformer and the 15560A output transformer.