User Guide

Model฀74/75฀User฀Guide฀ Issue฀3,฀November฀2016฀
Studio฀Technologies,฀Inc.฀ Page฀11
for Surround
฀ ฀ Signal฀ Signal฀
฀ Connections฀ High฀(+)฀ Low฀(–)฀ Shield
฀ SURROUND฀A-L฀ 24฀ 12฀ 25
฀ SURROUND฀A-R฀ 10฀ 23฀ 11
฀ SURROUND฀A-C฀ 21฀ 9฀ 22
฀ SURROUND฀A-LFE฀ 7฀ 20฀ 8
฀ SURROUND฀A-LS฀ 18฀ 6฀ 19
฀ SURROUND฀A-RS฀ 4฀ 17฀ 5
฀ STEREO฀A-L฀ 15฀ 3฀ 16
฀ STEREO฀A-R฀ 1฀ 14฀ 2
Notes:฀1)฀Connector฀type฀on฀Model฀74฀is฀25-pin฀female฀฀
฀ D-subminiature฀(DE-25F).฀Installer฀must฀provide฀male฀฀
฀ (DE-25M).฀Connector฀uses฀4-40฀threaded฀inserts฀for฀฀
฀ locking฀with฀mating฀plug.
฀ 2)฀Wiring฀scheme฀follows฀TASCAM฀DA-88฀convention.฀฀
฀ Standard฀DA-88-type฀wiring฀harnesses฀are฀directly฀฀
฀ compatible,฀with฀the฀exception฀of฀4-40฀screw฀threads฀฀
฀ being฀required.
Figure฀6.฀Connections฀for฀Inputs฀Surround฀A฀
and฀Stereo฀A
฀ ฀ Signal฀ Signal฀
฀ Connections฀ High฀(+)฀ Low฀(–)฀ Shield
฀ SURROUND฀B-L฀ 24฀ 12฀ 25
฀ SURROUND฀B-R฀ 10฀ 23฀ 11
฀ SURROUND฀B-C฀ 21฀ 9฀ 22
฀ SURROUND฀B-LFE฀ 7฀ 20฀ 8
฀ SURROUND฀B-LS฀ 18฀ 6฀ 19
฀ SURROUND฀B-RS฀ 4฀ 17฀ 5
฀ STEREO฀B-L฀ 15฀ 3฀ 16
฀ STEREO฀B-R฀ 1฀ 14฀ 2
Notes:฀1)฀Connector฀type฀on฀Model฀74฀is฀25-pin฀female฀฀
฀ D-subminiature฀(DE-25F).฀Installer฀must฀provide฀male฀฀
฀ (DE-25M).฀Connector฀uses฀4-40฀threaded฀inserts฀for฀฀
฀ locking฀with฀mating฀plug.
฀ 2)฀Wiring฀scheme฀follows฀TASCAM฀DA-88฀convention.฀฀
฀ Standard฀DA-88-type฀wiring฀harnesses฀are฀directly฀฀
฀ compatible,฀with฀the฀exception฀of฀4-40฀screw฀threads฀฀
฀ being฀required.
Figure฀7.฀Connections฀for฀Inputs฀Surround฀B฀
and฀Stereo฀B
Surround฀and฀Stereo฀Inputs
The฀connector฀labeled฀Surround฀Input฀A฀฀
and฀Stereo฀Input฀A,฀as฀well฀as฀the฀connec-
tor฀labeled฀Surround฀Input฀B฀and฀Stereo฀
Input฀B฀are฀used฀to฀interface฀with฀the฀two฀
6-channel฀(5.1฀surround)฀and฀two฀2-channel฀
(stereo)฀input฀circuits.฀Please฀refer฀to฀Fig-
ures฀6฀and฀7฀for฀details฀on฀the฀exact฀pin฀out฀
of฀the฀D-sub฀connectors.฀Each฀input฀circuit฀
is฀electronically฀balanced฀and฀intended฀
for฀connection฀to฀balanced฀or฀unbalanced฀
sources฀with฀nominal฀signal฀levels฀of฀฀
–12฀dBV฀to฀+6฀dBu.฀A฀15-turn฀trim฀potenti-
ometer฀is฀associated฀with฀each฀input฀฀
channel,฀allowing฀the฀input฀sensitivity฀to฀฀
be฀adjusted฀to฀match฀the฀source’s฀level.฀฀
The฀configuration฀section฀of฀this฀guide฀฀
provides฀details฀on฀using฀the฀trim฀pots.
Balanced฀sources฀should฀be฀wired฀so฀that฀
signal฀high฀is฀connected฀to฀+,฀signal฀low฀to฀
–,฀and฀shield฀to฀the฀shield฀connection.฀With฀
an฀unbalanced฀source,฀connect฀signal฀high฀
to฀the฀+฀connection,฀and฀shield฀to฀both฀the฀
–฀and฀the฀shield฀connections.฀If฀connecting฀
to฀an฀unbalanced฀source฀in฀this฀manner฀re-
sults฀in฀hum฀or฀noise,฀try฀connecting฀signal฀
high฀to฀+,฀and฀shield฀to฀–;฀leave฀the฀shield฀
connection฀unterminated.
It฀is฀highly฀recommended฀that฀at฀least฀one฀
of฀the฀surround฀inputs฀be฀wired฀by฀way฀of฀
an฀audio฀patch฀bay.฀This฀will฀allow฀the฀chan-
nels฀associated฀with฀that฀input฀source฀to฀
be฀easily฀rerouted.฀While฀signals฀generated฀
within฀a฀facility฀will฀normally฀follow฀a฀specific฀
format,฀such฀as฀left,฀right,฀center,฀LFE,฀left฀
surround,฀and฀right฀surround,฀it฀is฀possible฀
that฀media฀provided฀by฀an฀outside฀facility฀฀
will฀follow฀a฀different฀scheme.