User Guide

Issue฀3,฀November฀2016฀ Model฀74/75฀User฀Guide฀
Page฀18฀ Studio฀Technologies,฀Inc.฀
for Surround
Entering฀and฀Exiting฀the฀Configuration฀
Mode
A฀small฀button฀is฀located฀on฀the฀back฀of฀the฀
Model฀75฀Control฀Console,฀adjacent฀to฀the฀
9-pin฀D-sub฀connector.฀Pressing฀and฀hold-
ing฀this฀button฀for฀two฀seconds฀places฀the฀
Model฀75฀into฀the฀configuration฀mode.฀In฀
the฀configuration฀mode฀the฀Model฀75’s฀ar-
ray฀of฀buttons฀and฀LEDs฀no฀longer฀perform฀
their฀normal฀functions,฀but฀instead฀allow฀
you฀to฀observe฀and฀change฀many฀of฀the฀
operating฀parameters.฀The฀mute/solo฀mode฀
LEDs฀light฀alternately฀to฀indicate฀that฀the฀
configuration฀mode฀is฀active.
To฀leave฀the฀configuration฀mode฀and฀return฀
the฀Model฀75฀to฀normal฀operation,฀once฀
again฀press฀and฀hold฀the฀configure฀button฀
for฀two฀seconds.฀Note฀that฀configuration฀
changes฀are฀stored฀only฀after฀the฀configu-
ration฀mode฀has฀been฀exited.
Our฀apologies฀to฀those฀of฀you฀who฀find฀the฀
configure฀button฀a฀pain฀to฀use,฀but฀it’s฀sup-
posed฀to฀be฀that฀way!฀Seriously,฀the฀top฀of฀
the฀button฀is฀slightly฀recessed฀from฀the฀฀
back฀panel,฀making฀it฀harder฀to฀acciden-
tally฀activate.฀We฀didn’t฀want฀normal฀opera-
tion฀to฀cease฀because฀someone฀pushed฀
the฀Model฀75฀into฀a฀“rats฀nest”฀of฀music฀
scores฀or฀track฀sheets!฀
There฀is฀no฀problem฀frequently฀“tweak-
ing”฀the฀Model฀75’s฀operating฀parameters฀
to฀achieve฀the฀desired฀performance.฀The฀
configuration฀data฀is฀stored฀in฀non-volatile฀
memory,฀which฀is฀rated฀for฀thousands฀of฀
read฀and฀write฀cycles฀and฀a฀retention฀time฀
in฀tens฀of฀years.
Input฀Channels฀Active
This฀configuration฀is฀a฀bit฀tricky฀to฀un-
derstand,฀but฀is฀really฀quite฀simple.฀The฀
configuration฀parameter฀for฀the฀number฀of฀
channels฀active฀for฀each฀input฀is฀provided฀
for฀those฀special฀cases฀where฀a฀source฀
has฀less฀channels฀than฀its฀usual,฀e.g.,฀less฀
than฀six฀for฀Surround฀A฀or฀B.
Let’s฀look฀at฀an฀example.฀Surround฀A฀is฀
connected฀to฀a฀6-channel฀source,฀so฀its฀
default฀configuration฀is฀fine.฀But฀the฀source฀
for฀Surround฀B฀is฀special,฀having฀only฀
three฀channels:฀left,฀center,฀and฀right.฀This฀
makes฀it฀not฀so฀“cool”฀for฀the฀operator฀to฀
select฀Surround฀B฀for฀monitoring,฀as฀the฀
unconnected฀left฀surround,฀right฀surround,฀
and฀LFE฀input฀channels฀will฀get฀routed฀to฀
their฀respective฀monitor฀outputs.฀Will฀the฀
unused฀input฀channels฀pick฀up฀significant฀
noise฀or฀hum?฀Unlikely,฀but฀why฀take฀a฀
chance฀at฀having฀a฀problem.฀Simply฀use฀
the฀input฀channels฀active฀configuration฀
function฀to฀disable฀the฀three฀unused฀chan-
nels.฀Now฀when฀Surround฀B฀is฀selected,฀
only฀the฀appropriate฀channels฀are฀selected฀
for฀monitoring.
Note฀that฀when฀a฀channel฀associated฀with฀
an฀input฀is฀disabled฀the฀input฀routing฀cir-
cuitry,฀under฀software฀control,฀no฀longer฀
selects฀it,฀but฀the฀corresponding฀monitor฀
output฀channel฀does฀not฀mute.฀With฀our฀
example,฀when฀selecting฀Surround฀B,฀our฀
mythical฀L/C/R฀source,฀all฀selected฀monitor฀
output฀channels฀will฀remain฀active,฀but฀the฀
input฀routing฀circuitry฀won’t฀enable฀the฀LS,฀
RS,฀and฀LFE฀inputs.฀While฀to฀some฀people฀
this฀might฀seem฀confusing฀and฀possibly฀a฀
design฀fault,฀it฀was฀implemented฀this฀way฀
because฀the฀StudioComm฀system฀allows฀
multiple฀inputs฀to฀be฀simultaneously฀select-
ed฀for฀monitoring;฀a฀surround฀source฀might฀
be฀selected฀at฀the฀same฀time฀as฀a฀stereo฀
source.฀Muting฀the฀outputs฀in฀response฀to฀
a฀single฀input฀channel฀being฀selected฀sim-
ply฀would฀not฀do!