User Guide

Issue฀3,฀November฀2016฀ Model฀74/75฀User฀Guide฀
Page฀6฀ Studio฀Technologies,฀Inc.฀
for Surround
Figure฀1.฀Model฀74฀Central฀Controller฀Front฀Panel
Power฀
present฀LED
Data฀
active฀LED
Stereo฀
Input฀A฀
trim฀pots
Surround฀
Input฀A฀
trim฀pots
Surround฀
Input฀B฀
trim฀pots
Stereo฀
Input฀B฀
trim฀pots
Figure฀2.฀Model฀74฀Central฀Controller฀Back฀Panel
To/from฀
Model฀75฀
Control฀
AC฀mains
input฀connection
Remote฀
control฀
inputs
Surround฀Input฀B฀
and฀Stereo฀Input฀B฀
connections
Output฀to฀
Model฀35฀
Talent฀฀
Amplifiers
Monitor฀B฀output฀
and฀line-level฀
talkback฀input
Monitor฀A฀output฀and฀
line-level฀cue฀audio฀
outputs
Surround฀Input฀A฀
and฀Stereo฀Input฀A฀
connections
Infrared฀
receiver฀
input
The฀Model฀74฀provides฀two฀6-channel฀
monitor฀outputs.฀A฀powerful฀system฀feature฀
is฀the฀ability฀to฀configure฀the฀monitor฀out-
puts฀to฀meet฀the฀exact฀needs฀of฀an฀instal-
lation.฀In฀a฀“straight-ahead”฀application฀the฀
monitor฀outputs฀might฀be฀configured฀to฀
support฀two฀independent฀surround฀(5.1)฀
loudspeaker฀systems.฀Alternately,฀one฀
surround฀and฀one฀stereo฀monitor฀system฀
could฀be฀connected.฀However,฀other฀more฀
unique฀configurations฀are฀also฀possible.฀
These฀include฀supporting฀alternate฀sur-
round฀monitor฀speaker฀systems฀or฀adding฀
additional฀subwoofer฀or฀surround฀speak-
ers.฀The฀monitor฀outputs฀are฀electronically฀
balanced฀and฀designed฀for฀connection฀to฀
audio฀power฀amplifiers฀or฀amplified฀loud-
speakers.฀Protection฀circuitry฀provides฀
power-up฀and฀power-down฀protection฀of฀
the฀connected฀loudspeaker฀systems.
Audio฀input฀and฀output฀connections฀are฀
made฀using฀four฀25-pin฀D-subminiature฀
connectors.฀The฀Model฀74’s฀audio฀path฀
features฀low-noise,฀low-distortion฀analog฀
switches฀for฀input฀source฀selection฀and฀
laser-trimmed฀voltage-controlled-amplifier฀
(VCA)฀integrated฀circuits฀for฀monitor฀level฀
control.฀One฀9-pin฀D-subminiature฀connec-
tor฀is฀used฀to฀connect฀the฀Model฀74฀to฀the฀
Model฀75฀Control฀Console.฀A฀second฀9-pin฀
“D-sub”฀connector฀is฀used฀to฀interface฀
remote฀control฀signals฀with฀the฀Model฀74.฀
The฀Model฀74’s฀talent฀amplifier฀output฀uses฀
a฀3-pin฀male฀XLR฀connector.฀An฀infrared฀
receiver฀module฀can฀connect฀to฀the฀Model฀
74฀using฀a฀3.5฀mm฀jack.
An฀advanced฀8-bit฀microcontroller฀provides฀
the฀logic฀“horsepower”฀for฀the฀Model฀74.฀
AC฀mains฀power฀is฀connected฀directly฀to฀
the฀Model฀74,฀which฀is฀factory฀selected฀฀
for฀100,฀120,฀or฀220/240฀V฀operation.฀฀
The฀internal฀power฀supply฀utilizes฀two฀฀
toroidal฀mains฀transformers฀for฀quiet฀฀
audio฀operation.