AX-1000A
The automatic microphone mixer shall have eight input ports and shall be capable of accepting
plug-in accessory modules designed for use with the mixer preamplifier including microphone,
line and special function models. The automatic mixer shall incorporate a continuously variable,
adjustable NOM-Attenuation control (with a range from 0logNOM to 20logNOM with a center
détente at 10logNOM) to allow precise adjustment of automatic mixing circuitry to the acoustical
environment of the facility in which the device shall be utilized. For flexibility and ease of set-up,
each channel shall be provided with Input Volume, Threshold Level and Off-Attenuation controls.
The Threshold Level control shall adjust the level at which the input gates on. The Off-Attenuation
control shall be continuously variable and shall allow attenuation of an inactive input from 0 to -40
dB. The Off-Attenuation setting shall not affect the channel gating, ensuring smooth turn-on
without any missed syllables. The Input Volume, Threshold Level, Off-Attenuation, and NOM-
Attenuation controls shall be front-panel mounted for ease of set-up. A security cover shall be
provided to protect the Off-Attenuation, Threshold and NOM-Attenuation controls from
unauthorized use. Each input channel shall incorporate a front panel LED to visually indicate the
gating function. A link Input/Output shall be provided allowing up to ten (10) devices together to
create a system with a maximum of eighty (80) input channels.

A rear panel Master/Slave switch shall be provided to allow any unit to function as a Master or
Slave unit when multiple units are incorporated into a sound reinforcement system. A front panel
LED shall visually indicate the position of the Master/Slave switch.

The automatic mixer shall incorporate logic outputs for each channel. The Logic Out shall be an
open collector circuit that can be utilized to trigger external devices. The automatic mixer shall
provide direct outputs for each channel, providing a buffered audio signal from the corresponding
input module.

The direct output shall only be affected by the circuitry within the input module; it shall not be
affected by the mixer’s gating, muting or gain sharing circuits. The direct outputs shall be capable
of being passively mixed. Dip switch selectable muting shall be provided to allow a chairman
override function for any combination of channels. Muting shall be accomplished by shorting the
rear panel mute terminals via a switch closure or relay contact. By utilizing TOA 900 Series
Muting Input Modules it shall be possible to provide two levels of muting. Rear panel Remote
Master Volume terminals shall be provided, the maximum gain of which shall be limited by the
front panel master volume control setting. Control shall be via a 10k linear potentiometer. The unit
shall measure 19.0” x 5.22” x 11.8” (483 x 133 x 300 mm) with rack-mount hardware attached,
shall have an aluminum anodized front panel and shall weight 15.5 lbs. (7.0 kg).

The modular eight channel automatic mixer shall be TOA model AX-1000A.