Toa AX-1000A, Руководство по эксплуатации

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FEATURES
NOM Attenuation
The AX-1000A's NOM Attenuation circuitry automatically adjusts gain level according to the number of active
inputs. NOM = Number of Open Microphones. Most automatic mixers reduce output according to the formula 10
log NOM. When two mic inputs are active, the system gain is lowered 3 dB; when four are active, the output is
reduced by 6 dB; etc. TOA's NOM Attenuation circuitry allows adjustment from 0 to 20 log NOM depending on the
system specifications. Consequently, installations incorporating the AX-1000A deliver maximum acoustic gain
without feed back.
900 Series Compatibility
Each of the AX-1000A's eight input ports accepts 900 Series Mic Level, Auxiliary, Phono, 600 ohm and 10k ohm
Bridging, Signal Generator Modules and the T-02 Module for Music-on-Hold. This allows the contractor or
specifying engineer ultimate flexibility in system design.
Up to ten AX-1000A mixers may be linked together to create a system with a maximum of 80 active input
channels. When units are linked, one mixer in the chain is the Master. This is accomplished by setting the
rear-panel Master/Slave switches.
In addition to the Main Output, the AX-1000A provides Direct and Logic Outputs for each channel.
Channel Direct Outputs
Channel Direct Output uses are limited only by the application. For example, direct signals can be input to a
logging recorder to provide an account of courtroom proceedings while the mixer controls the communications
system itself. Or, the Direct Outputs from certain channels can be fed into a second mixer or mixer-amplifier.
Logic Outputs
The Logic Output is an isolated open collector circuit that will trigger external devices. Applications include video
camera control, tape recorder control, and control of distributed speaker systems.
Input Channel Controls
Each channel has an Input Volume Control.
This adjusts channel gain and allows balancing
the mixing among the eight audio sources.
Behind a front-panel security cover lie the trim
controls for each channel's Threshold and
Off-Attenuation. The Threshold control adjusts
the signal level at which the input switches from
'off' to 'on'. As automatic mixing occurs, the
AX-1000A uses this setting as the 'base line'
and changes each channel's Threshold in an
adaptive manner.
Off-Attenuation sets channel attenuation depth
when the gate is 'off'. Inactive inputs may be
attenuated from 0 dB to as much as 40 dB.
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