User Guide

Model฀74/75฀User฀Guide฀ Issue฀3,฀November฀2016฀
Studio฀Technologies,฀Inc.฀ Page฀13
for Surround
Headphone฀Cue฀System
Two฀outputs฀and฀one฀input฀are฀associated฀
with฀the฀headphone฀cue฀system.฀The฀talent฀
amplifier฀output฀supplies฀audio฀and฀DC฀฀
power฀for฀supporting฀Model฀35฀Talent฀฀
Amplifier฀units.฀Using฀this฀method฀a฀great-
sounding,฀flexible฀cue฀system฀can฀be฀
easily฀created.฀A฀stereo฀line-level฀output฀
associated฀with฀the฀headphone฀cue฀sys-
tem฀is฀also฀available.฀A฀source฀of฀line-level฀
audio฀can฀be฀connected฀and฀can฀serve฀as฀
the฀talkback฀audio฀source.฀This฀source฀can฀
be฀used฀in฀place฀of฀the฀microphone฀con-
tained฀in฀the฀Model฀75฀Control฀Console.
Talent฀Amplifier฀Output
Up฀to฀four฀Model฀35฀Talent฀Amplifiers฀can฀
be฀connected฀to฀the฀Model฀74’s฀talent฀
amplifier฀output.฀The฀output฀connector฀is฀a฀
3-pin฀male฀XLR.฀For฀best฀performance,฀use฀
low-capacitance฀shielded฀microphone-type฀
cable฀to฀distribute฀the฀talent฀amplifier฀sig-
nal.฀If฀there฀is฀a฀choice,฀select฀cables฀with฀
the฀heaviest฀wire฀gauge฀commonly฀avail-
able.฀This฀will฀reduce฀voltage฀drop฀when฀
using฀long฀cable฀runs.฀Refer฀to฀the฀Techni-
cal฀Notes฀section฀for฀additional฀information.
The฀simplest฀installation฀would฀use฀a฀฀
microphone฀cable฀to฀connect฀the฀Model฀74฀
to฀the฀first฀talent฀amplifier;฀the฀loop฀through฀
connector฀on฀that฀talent฀amp฀sending฀the฀
signal฀on฀to฀the฀next฀talent฀amp.
For฀convenience,฀you฀may฀want฀to฀wire฀
your฀facility฀to฀allow฀easy฀access฀to฀the฀
talent฀amplifier฀signal฀at฀all฀locations฀where฀
talent฀amplifiers฀might฀be฀used.฀The฀tal-
ent฀amplifiers฀connect฀to฀the฀Model฀74฀in฀
parallel,฀so฀the฀connectors฀on฀the฀distribu-
tion฀panels฀or฀mult฀boxes฀should฀be฀wired฀
in฀parallel.
Warning:฀Do฀not฀connect฀the฀Model฀
74’s฀talent฀amplifier฀output฀to฀anything฀
but฀Studio฀Technologies’฀talent฀ampli-
fiers.฀Some฀audio฀equipment฀may฀be฀
damaged฀by฀the฀DC฀voltage฀contained฀
on฀pin฀2฀of฀the฀talent฀amplifier฀output฀
connector.
Included฀with฀each฀Model฀35฀Talent฀฀
Amplifier฀is฀a฀nifty฀mounting฀adapter฀that฀฀
allows฀the฀unit฀to฀be฀conveniently฀attached฀
to฀a฀microphone฀stand.฀Please฀refer฀to฀the฀
documentation฀provided฀in฀the฀Model฀35’s฀
shipping฀carton฀for฀details.
Line-Level฀Cue฀Output
A฀2-channel฀(stereo)฀line-level฀output฀
provides฀access฀to฀the฀headphone฀cue฀
system฀signals.฀The฀line-level฀cue฀output฀
channel฀is฀intended฀for฀connection฀to฀฀
an฀audio฀amplifier฀associated฀with฀a฀฀
headphone฀cue฀system.฀It฀could฀also฀be฀
useful฀for฀connecting฀with฀a฀remotely฀
located฀studio฀or฀production฀facility.฀Using฀
ISDN฀or฀IP-based฀technology,฀being฀able฀
to฀send฀audio฀signals฀to฀literally฀any฀part฀of฀
the฀world฀has฀become฀a฀fairly฀simple฀task.฀
The฀headphone฀cue฀signals฀are฀accessible฀
on฀one฀of฀the฀25-pin฀female฀D-subminia-
ture฀connectors,฀located฀on฀the฀Model฀74’s฀
back฀panel.฀Please฀refer฀to฀Figure฀8฀for฀
details฀on฀the฀exact฀“pin฀out”฀of฀the฀D-sub.
The฀line-level฀cue฀outputs฀are฀electroni-
cally฀balanced,฀capacitor฀coupled,฀and฀
intended฀to฀drive฀balanced฀or฀unbalanced฀
loads฀of฀600฀ohms฀or฀greater.฀While฀bal-
anced฀operation฀is฀preferred,฀unbalanced฀
operation฀does฀not฀pose฀a฀problem.฀To฀
connect฀to฀an฀unbalanced฀load฀connect฀
the฀+฀terminal฀as฀signal฀high,฀and฀both฀the฀
–฀and฀shield฀as฀the฀signal฀low/shield.