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StudioComm for Surround Model 74 Central Controller and Model 75 Control Console

50221-1116,฀Issue฀3

www.studio-tech.com

Model฀74฀Central฀Controller฀and

Model฀75฀Control฀Console

User฀Guide

Issue฀3,฀November฀2016

This฀User฀Guide฀is฀applicable฀for฀systems฀consisting฀of:

Model฀74:฀serial฀number฀M74-00151฀and฀later;

Model฀75:฀M75-00151฀and฀later

for Surround

Summary of content (57 pages)

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for Surround Model฀74฀Central฀Controller฀and Model฀75฀Control฀Console User฀Guide Issue฀3,฀November฀2016 This฀User฀Guide฀is฀applicable฀for฀systems฀consisting฀of: Model฀74:฀serial฀number฀M74-00151฀and฀later; Model฀75:฀M75-00151฀and฀later Copyright฀©฀2016฀by฀Studio฀Technologies,฀Inc.,฀all฀rights฀reserved www.studio-tech.
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This฀page฀intentionally฀left฀blank.
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for Surround Table of Contents Introduction฀...................................................................฀฀5 Installation฀....................................................................10 Conﬁguration฀................................................................16 Operation฀......................................................................34 Technical฀Notes฀............................................................39 Speciﬁcations฀........................................................
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for Surround This฀page฀intentionally฀left฀blank. Issue฀3,฀November฀2016฀ Page฀4฀ Model฀74/75฀User฀Guide฀ Studio฀Technologies,฀Inc.
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for Surround Introduction What฀This฀User฀Guide฀Covers This฀User฀Guide฀is฀designed฀to฀assist฀you฀ when฀installing฀and฀using฀the฀Model฀74฀ Central฀Controller฀and฀the฀Model฀75฀฀ Control฀Console.฀ StudioComm฀for฀Surround The฀StudioComm฀for฀Surround฀Model฀74฀ Central฀Controller฀and฀Model฀75฀Control฀ Console฀work฀together฀to฀provide฀5.1฀ surround฀and฀stereo฀source฀monitoring฀capabilities,฀along฀with฀a฀full-featured฀ headphone฀“talkback”฀cue฀system.
PAGE 6
for Surround The฀Model฀74฀provides฀two฀6-channel฀ monitor฀outputs.฀A฀powerful฀system฀feature฀ is฀the฀ability฀to฀conﬁgure฀the฀monitor฀outputs฀to฀meet฀the฀exact฀needs฀of฀an฀installation.฀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.
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for Surround Figure฀3.฀Model฀75฀Control฀Console฀Front฀Panel Channel฀mute/solo Mute/solo฀ mode฀select Talkback฀ microphone Stereo฀to฀mono downmix 5.1฀to฀stereo฀ downmix Monitor฀Output฀ •฀Speaker฀system฀฀ ฀฀select •฀Reference฀level฀ •฀Mute฀all฀ •฀Dim฀ •฀Rotary฀level฀control Input฀source฀ select Talkback Model฀75฀Control฀Console The฀Model฀75฀Control฀Console฀is฀a฀compact,฀self-contained฀unit฀designed฀to฀be฀ located฀at฀the฀operator’s฀position.
PAGE 8
for Surround position.฀This฀is฀useful฀in฀applications฀such฀ as฀on-air฀broadcast.฀By฀using฀the฀reference฀ level฀function,฀the฀monitor฀output฀level฀can฀ be฀set฀to฀a฀pre-conﬁgured฀value.฀This฀is฀ provided฀for฀audio-with-picture฀applications฀ that฀require฀a฀speciﬁc฀monitor฀level.฀The฀ reference฀level฀is฀easily฀conﬁgured฀by฀taking฀an฀electronic฀“snapshot”฀of฀the฀position฀ of฀the฀rotary฀level฀control. One฀button฀controls฀which฀monitor฀output,฀ A฀or฀B,฀is฀active.
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for Surround For฀ﬂexibility,฀the฀system฀is฀designed฀to฀ easily฀integrate฀with฀recording฀consoles,฀ specialized฀playback฀systems,฀and฀audiofor-picture฀machine-control฀electronics.฀ Four฀hard-wired฀remote-control฀input฀functions฀are฀provided:฀mute฀all,฀dim,฀talkback,฀ and฀input฀select.฀By฀providing฀access฀to฀ the฀StudioComm’s฀mute฀all฀and฀dim฀functions,฀talkback฀or฀slate฀activity฀from฀an฀ audio฀console฀or฀other฀communications฀ system฀can฀control฀the฀monitor฀output฀ level.
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for Surround that฀arrives฀via฀the฀surround฀inputs.฀(It฀ would฀be฀confusing,฀and฀technically฀incorrect,฀to฀refer฀to฀LFE฀loudspeakers.) Installation In฀this฀section฀you฀will฀be฀installing฀the฀ Model฀74฀Central฀Controller฀in฀an฀equipment฀rack.฀Audio฀input,฀monitor฀output,฀and฀ headphone฀cue฀system฀connections฀will฀be฀ made.฀One฀or฀more฀Model฀35฀Talent฀Ampliﬁers฀will฀be฀connected.฀A฀location฀will฀be฀ selected฀for฀the฀Model฀75฀Control฀Console฀ and฀it฀will฀be฀connected฀to฀the฀Model฀74.
PAGE 11
for Surround ฀ ฀ ฀ Connections฀ Signal฀ High฀(+)฀ Signal฀ 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).
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for Surround ฀ ฀ ฀ Connections฀ Signal฀ High฀(+)฀ Signal฀ Low฀(–)฀ Shield฀ ฀ MONITOR฀OUT฀A-L฀ 24฀ 12฀ 25 ฀ MONITOR฀OUT฀A-R฀ 10฀ 23฀ 11 ฀ MONITOR฀OUT฀A-C฀ 21฀ 9฀ 22 ฀ MONITOR฀OUT฀A-SUB฀ 7฀ 20฀ 8 ฀ MONITOR฀OUT฀A-LS฀ 18฀ 6฀ 19 ฀ MONITOR฀OUT฀A-RS฀ 4฀ 17฀ 5 ฀ CUE฀OUT-L฀ 15฀ 3฀ 16 ฀ CUE฀OUT-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).
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฀greatsounding,฀ﬂexible฀cue฀system฀can฀be฀ easily฀created.฀A฀stereo฀line-level฀output฀ associated฀with฀the฀headphone฀cue฀system฀is฀also฀available.฀A฀source฀of฀line-level฀ audio฀can฀be฀connected฀and฀can฀serve฀as฀ the฀talkback฀audio฀source.
PAGE 14
for Surround Note฀that฀while฀the฀line-level฀cue฀outputs฀ are฀electronically฀balanced,฀signal฀is฀only฀ driven฀on฀the฀+฀connection.฀The฀–฀connection฀serves฀only฀as฀a฀signal-balancing฀ return฀path.฀This฀simpliﬁed฀output฀circuit฀ was฀deemed฀appropriate฀for฀headphone฀ cue฀system฀applications.฀It฀provides฀good฀ audio฀quality฀even฀though฀its฀circuitry฀is฀not฀ as฀sophisticated฀as฀that฀used฀by฀the฀monitor฀output฀channels.
PAGE 15
for Surround ฀Pin฀ Signal฀ Direction ฀ 1฀ Power฀Supply฀Common฀ 74฀to/from฀75 ฀ 2฀ +15฀Volts฀DC฀ 74฀to฀75 ฀ 3฀ Data฀(MIDI฀System-Exclusive)฀ 75฀to฀74฀ ฀ 4฀ Data฀Common฀ 74฀to/from฀75 ฀ 5฀ Remote฀Mute฀All฀ 74฀to฀75฀(Note฀2) ฀ 6฀ Remote฀Dim฀ 74฀to฀75฀(Note฀2) ฀ 7฀ Remote฀Talkback฀ 74฀to฀75฀(Note฀2) ฀ 8฀ Remote฀Input฀Select฀ 74฀to฀75฀(Note฀2) ฀ 9฀ Talkback฀Mic฀Audio฀ 75฀to฀74 Notes:฀ 1)฀Connector฀types฀on฀Model฀74฀and฀Model฀75฀are฀฀ ฀ 9-pin฀female฀D-subminiature฀(DE-9F).
PAGE 16
for Surround AC฀Mains฀Power The฀Model฀74฀is฀internally฀conﬁgured฀to฀ operate฀from฀an฀AC฀mains฀power฀source฀of฀ nominal฀100,฀120,฀or฀220/240฀volts,฀50/60฀ hertz.฀Units฀shipped฀to฀North฀America฀are฀ factory฀selected฀for฀120฀volt฀operation.฀ Units฀bound฀for฀Japan฀must฀be฀selected฀for฀ 100฀volts,฀while฀our฀friends฀“down฀under”฀ and฀in฀Europe฀receive฀units฀set฀for฀220/240฀ volts.฀Before฀connecting฀the฀Model฀74฀to฀ AC฀mains฀power,฀check฀that฀it฀is฀conﬁgured฀ to฀match฀the฀local฀mains฀voltage.
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for Surround Procedure This฀procedure฀will฀calibrate฀the฀surround฀ and฀stereo฀input฀channels.฀The฀trim฀pots฀ will฀be฀adjusted฀in฀groups฀corresponding฀฀ to฀their฀associated฀input฀sources. 1.฀ Begin฀by฀turning฀the฀audio฀ampliﬁers฀ or฀ampliﬁed฀speakers฀to฀their฀off฀state.฀ This฀will฀protect฀the฀loudspeakers฀and฀ the฀operator’s฀ears฀from฀possible฀฀ damage. 2.฀ Rotate฀the฀level฀control฀on฀the฀Model฀ 75฀to฀the฀fully฀clockwise฀(maximum)฀ position. 10.
PAGE 18
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฀holding฀this฀button฀for฀two฀seconds฀places฀the฀ Model฀75฀into฀the฀conﬁguration฀mode.฀In฀ the฀conﬁguration฀mode฀the฀Model฀75’s฀array฀of฀buttons฀and฀LEDs฀no฀longer฀perform฀ their฀normal฀functions,฀but฀instead฀allow฀ you฀to฀observe฀and฀change฀many฀of฀the฀ operating฀parameters.
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for Surround A฀special฀mode฀has฀been฀included฀to฀ disable฀an฀input฀from฀being฀accessed฀ by฀the฀operator.฀This฀might฀be฀useful,฀for฀ example,฀when฀Stereo฀B฀is฀not฀connected฀ to฀a฀source,฀and฀has฀no฀valid฀reason฀to฀ be฀selected.฀This฀might฀also฀be฀useful฀ when฀connecting฀a฀special฀source,฀such฀ as฀a฀house฀“tie฀line”฀or฀router฀output,฀that฀ shouldn’t฀normally฀be฀accessible.
PAGE 20
for Surround multiple฀channels฀can฀be฀simultaneously฀ “soloed,”฀allowing฀those฀channels฀to฀be฀ monitored฀at฀the฀same฀time.฀Other฀operators฀may฀prefer฀the฀exclusive฀solo฀mode.฀ When฀this฀mode฀is฀selected,฀only฀one฀ channel฀can฀be฀selected฀for฀solo฀at฀a฀time.฀ The฀additive฀solo฀mode฀is฀the฀default฀฀ setting. Power-Up฀Mute฀All By฀default,฀upon฀application฀of฀AC฀mains฀ power฀the฀monitor฀outputs฀remain฀muted฀ after฀the฀system’s฀power-up฀sequence฀ has฀been฀performed.
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for Surround Setting฀the฀reference฀level฀is฀very฀simple: 1.฀ Set฀up฀a฀precision฀sound฀pressure฀ level฀(SPL)฀measuring฀device฀at฀the฀ desired฀listening฀location. 2.฀ Place฀the฀StudioComm฀system฀in฀the฀ normal฀operating฀mode,฀not฀the฀conﬁguration฀mode.฀Be฀certain฀that฀the฀ reference฀and฀dim฀functions฀are฀not฀฀ active. 3.฀ Use฀the฀Model฀75฀Control฀Console฀to฀ select฀the฀input฀source฀that฀contains฀ the฀desired฀reference฀signal฀source,฀ e.g.,฀pink฀noise. 4.
PAGE 22
for Surround Remote฀Mute฀All Two฀conﬁguration฀choices฀are฀associated฀ with฀the฀remote฀mute฀all฀function:฀disabled฀ and฀enabled.฀To฀utilize฀the฀function฀simply฀ conﬁgure฀it฀for฀enabled.฀ Remote฀Dim Two฀conﬁguration฀choices฀are฀associated฀ with฀the฀remote฀dim฀function:฀disabled฀and฀ enabled.฀To฀utilize฀the฀function฀simply฀conﬁgure฀it฀for฀enabled. Remote฀Talkback Two฀conﬁguration฀choices฀are฀associated฀ with฀the฀remote฀talkback฀function:฀disabled฀and฀enabled.
PAGE 23
for Surround right,฀channels.฀While฀the฀0฀dB฀setting฀is฀ not฀generally฀appropriate฀for฀music฀mixing,฀ it฀may฀ﬁnd฀use฀in฀broadcast฀and฀cinema฀ applications.฀The฀3฀dB฀and฀4฀dB฀settings฀ are฀good฀choices฀for฀the฀mono-to-center฀ mode฀when฀monitoring฀mixes฀that฀have฀ signiﬁcant฀phase฀coherence,฀such฀as฀฀ music฀sources.฀The฀6฀dB฀setting฀is฀provided฀for฀compatibility฀with฀the฀mono฀function฀ found฀on฀many฀audio฀consoles.฀As฀the฀ factory฀default,฀the฀3฀dB฀attenuation฀value฀ was฀selected. Auto฀5.
PAGE 24
for Surround Model฀75฀Conﬁguration—Entering฀and฀Exiting฀฀ Conﬁguration฀Mode  Press฀and฀hold฀the฀conﬁguration฀ button฀for฀two฀seconds฀to฀enter฀or฀ exit฀the฀conﬁguration฀mode. These฀LEDs฀will฀light฀alternately when฀conﬁguration฀mode฀is฀active. Issue฀3,฀November฀2016฀ Page฀24฀ Model฀74/75฀User฀Guide฀ Studio฀Technologies,฀Inc.
PAGE 25
for Surround Model฀75฀Conﬁguration—Input฀Channels฀Active  Press฀and฀hold฀an฀input฀ button฀(one฀at฀a฀time)฀to฀ display฀and฀select฀which฀ channels฀associated฀with฀ that฀input฀are฀active. When฀an฀input฀button฀is฀pressed,฀these฀฀ LEDs฀display฀which฀input฀channels฀are฀฀ active฀for฀that฀input.฀A฀lit฀LED฀indicates฀฀ that฀the฀channel฀is฀active.฀Use฀the฀buttons฀฀ to฀change฀the฀conﬁguration. Default:฀ ฀ For฀Surround฀A฀and฀Surround฀B,฀all฀six฀channels฀(L,฀C,฀R,฀LS,฀RS,฀LFE)฀are฀active.
PAGE 26
for Surround Model฀75฀Conﬁguration—Speaker฀Systems/Monitor฀Outputs When฀an฀output฀button฀is฀pressed,฀these฀LEDs฀display฀which฀ output(s)฀are฀assigned฀to฀speaker฀systems฀A฀and฀B: Press฀Surround฀A฀button฀to฀assign฀output฀A฀to฀speaker฀system฀A;฀ Press฀Surround฀B฀button฀to฀assign฀output฀B฀to฀speaker฀system฀A;฀ Press฀Stereo฀A฀button฀to฀assign฀output฀A฀to฀speaker฀system฀B;฀ Press฀Stereo฀B฀button฀to฀assign฀output฀B฀to฀speaker฀system฀B.
PAGE 27
for Surround Model฀75฀Conﬁguration—Talkback While฀holding฀the฀฀ Talkback฀button,฀these฀ LEDs฀display฀the฀ status฀of฀the฀talkback฀ audio฀source.฀Press฀ the฀Surround฀A฀button฀ to฀select฀Model฀75฀mic฀ as฀talkback฀source.฀ Press฀Surround฀B฀to฀ select฀Aux฀TB฀In฀as฀ talkback฀source.฀฀ Surround฀A฀LED฀lit฀ indicates฀Model฀75฀mic฀ as฀talkback฀source.฀ Surround฀B฀LED฀lit฀ indicates฀Aux฀TB฀In฀as฀ talkback฀source.
PAGE 28
for Surround Model฀75฀Conﬁguration—Solo,฀Power-Up฀Mute฀All,฀Level฀ Control฀Response,฀and฀Level฀Control฀Auto฀Mute฀All When฀the฀Speaker฀System฀A/B฀button฀฀ is฀pressed,฀these฀LEDs฀display฀the฀฀ status฀of฀the฀solo฀mode.฀When฀LED฀L฀฀ is฀lit฀additive฀solo฀mode฀is฀enabled;฀ when฀LED฀C฀is฀lit฀exclusive฀solo฀mode฀฀ is฀enabled.฀Use฀the฀buttons฀to฀change฀฀ the฀conﬁguration. When฀the฀Speaker฀System฀A/B฀button฀is฀ pressed,฀these฀LEDs฀display฀the฀status฀of฀ the฀power-up฀mute฀all฀function.
PAGE 29
for Surround Model฀75฀Conﬁguration—Reference฀Level  Press฀and฀hold฀the฀Ref฀button฀for฀ﬁve฀ seconds฀to฀take฀a฀“snapshot”฀of฀the฀level฀ control’s฀present฀setting.฀The฀Ref฀LED฀will฀ light฀when฀the฀“snapshot”฀has฀been฀taken. Default:฀ Fully฀attenuated฀(minimum)฀monitor฀output฀level. Note:฀ ฀ The฀5-second฀delay฀is฀a฀safety฀feature,฀ensuring฀that฀the฀reference฀level฀will฀not฀be฀accidently฀changed.฀฀ To฀permanently฀store฀the฀new฀value,฀you฀must฀still฀exit฀the฀conﬁguration฀mode.
PAGE 30
for Surround Model฀75฀Conﬁguration—Remote฀Input฀Select฀ These฀LEDs฀display฀the฀mode฀of฀the฀remote฀input฀select฀function.฀ LED฀L฀lit฀means฀that฀the฀function฀is฀disabled.฀LED฀C฀lit฀means฀that฀ the฀function฀provides฀exclusive฀input฀select.฀LED฀R฀lit฀means฀that฀ the฀function฀provides฀non-exclusive฀input฀select.฀Use฀the฀buttons฀ to฀change฀the฀conﬁguration.
PAGE 31
for Surround Model฀75฀Conﬁguration—Dim฀Level,฀Remote฀Mute฀All,฀Remote฀ Dim,฀Remote฀Talkback,฀Auto฀Dim฀Off,฀and฀Talkback฀Dim These฀LEDs฀display฀the฀conﬁguration฀฀ of฀remote฀mute฀all.฀LED฀L฀lit฀means฀that฀ remote฀mute฀all฀is฀disabled;฀LED฀C฀lit฀฀ means฀enabled.฀Use฀the฀buttons฀to฀฀ change฀the฀conﬁguration. These฀LEDs฀display฀the฀conﬁguration฀฀ of฀remote฀dim.฀LED฀R฀lit฀means฀that฀ remote฀dim฀is฀disabled;฀LED฀LS฀lit฀ means฀enabled.฀Use฀the฀buttons฀to฀ change฀the฀conﬁguration.
PAGE 32
for Surround Model฀75฀Conﬁguration—Stereo฀to฀Mono฀Downmix  Press฀and฀hold฀the฀Mono฀button฀to฀display฀ and฀conﬁgure฀the฀stereo฀to฀mono฀downmix฀ mode,฀whether฀5.1฀to฀stereo฀downmix฀is฀฀ automatically฀activated฀when฀stereo฀to฀mono฀ downmix฀is฀activated,฀and฀the฀attenuation฀ level฀when฀mono฀is฀active. When฀the฀Mono฀button฀is฀pressed,฀these฀LEDs฀display฀the฀ mode฀of฀the฀stereo฀to฀mono฀downmix฀function.฀When฀LED฀L฀฀ is฀lit฀the฀mono-to-left-and-right฀mode฀is฀selected.
PAGE 33
for Surround Model฀75฀Conﬁguration—Restore฀Factory฀Defaults  Press฀and฀hold฀both฀Surround฀A฀and฀Stereo฀B฀buttons฀for฀ﬁve฀seconds฀to฀restore฀Model฀ 75฀factory฀defaults.฀Once฀defaults฀have฀been฀restored,฀the฀LEDs฀will฀light.฀After฀buttons฀ are฀released,฀conﬁguration฀mode฀will฀be฀exited฀and฀normal฀operation฀will฀resume. Factory฀Defaults:฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ All฀channels฀associated฀with฀each฀input฀are฀active.฀ Speaker฀system฀A฀all฀six฀channels฀are฀assigned฀to฀output฀A฀only.
PAGE 34
for Surround Operation Now฀that฀you’ve฀installed฀and฀conﬁgured฀ the฀system,฀you’re฀ready฀to฀go.฀You฀should฀ ﬁnd฀operation฀very฀easy. Model฀74฀Central฀Controller The฀Model฀74’s฀front฀panel฀contains฀฀ two฀LEDs.฀The฀power฀LED฀should฀be฀lit฀ whenever฀AC฀mains฀power฀is฀connected.฀ The฀data฀LED฀will฀light฀whenever฀a฀MIDI฀ system-exclusive฀message฀is฀received฀ from฀the฀Model฀75.
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for Surround to฀stereo฀or฀stereo฀signals฀converted฀to฀ mono.฀How฀these฀functions฀affect฀the฀audio฀ signals฀will฀greatly฀depend฀on฀how฀the฀ Model฀75฀is฀conﬁgured.฀Being฀aware฀of฀the฀ selected฀conﬁguration฀will฀allow฀the฀functions฀to฀serve฀a฀more฀useful฀role. 5.1฀to฀Stereo The฀5.1฀to฀stereo฀downmix฀function฀allows฀ surround฀signals฀to฀be฀mixed฀or฀“folded฀ down”฀into฀a฀stereo฀(left฀and฀right)฀signal.฀ Phase฀relationships฀and฀inter-channel฀level฀ issues฀can฀be฀quickly฀observed.
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for Surround To฀enable฀the฀bandpass฀ﬁlter฀feature฀ requires฀knowing฀a฀“secret”฀button฀push฀ method.฀But฀it’s฀not฀much฀of฀a฀secret,฀as฀ you฀simply฀press฀and฀hold฀the฀downmix฀ mono฀button฀for฀two฀seconds฀to฀enable฀the฀ function.฀From฀that฀point฀forward,฀whenever฀the฀stereo฀to฀mono฀downmix฀function฀ is฀enabled฀the฀bandpass฀ﬁlter฀will฀also฀be฀ enabled.฀To฀indicate฀that฀the฀bandpass฀ﬁlter฀is฀enabled,฀the฀LED฀associated฀with฀the฀ downmix฀mono฀button฀will฀ﬂash฀whenever฀ its฀associated฀function฀is฀enabled.
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for Surround when฀dim฀is฀active.฀The฀LED฀associated฀ with฀the฀dim฀button฀will฀light฀whenever฀dim฀ is฀active. Other฀functions฀can฀also฀cause฀the฀dim฀ function฀to฀enable.฀Depending฀on฀how฀the฀ Model฀75฀is฀conﬁgured,฀it฀may฀also฀enable฀ whenever฀the฀talkback฀function฀is฀active.฀ The฀remote฀dim฀function฀allows฀a฀hardwired฀control฀signal฀to฀enable฀dim.฀If฀dim฀฀ is฀enabled฀via฀remote฀dim,฀the฀dim฀LED฀ will฀ﬂash.
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for Surround simultaneously฀soloed,฀simply฀push฀and฀ hold฀a฀channel฀button,฀then฀add฀the฀extra฀ channels฀by฀momentarily฀pressing฀their฀฀ buttons. audio฀source฀or฀it฀will฀replace฀(interrupt)฀ the฀source.฀Note฀that฀it’s฀also฀possible฀to฀ conﬁgure฀the฀system฀so฀that฀no฀cue฀audio฀ source฀will฀be฀present฀at฀any฀time. Headphone฀Cue฀System/Talkback The฀headphone฀cue฀system฀and฀its฀associated฀talkback฀function฀is฀simple฀to฀use,฀but฀ does฀offer฀a฀number฀of฀user฀and฀conﬁguration฀options.
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for Surround ture฀and฀isn’t฀a฀design฀deﬁciency.฀The฀overall฀ level฀for฀a฀pair฀of฀headphones฀connected฀to฀ a฀Model฀35฀Talent฀Ampliﬁer฀is฀adjusted฀using฀ the฀Model฀35’s฀level฀control.฀A฀headphone฀ cue฀system฀connected฀to฀the฀Model฀74’s฀ line-level฀cue฀output฀must฀have฀its฀own฀level฀ controls. Remote฀Controls Four฀hard-wired฀remote฀control฀signals฀฀ can฀be฀connected฀to฀the฀system฀and฀conﬁgured฀for฀the฀desired฀operating฀characteristics:฀mute฀all,฀dim,฀talkback,฀and฀input฀select.
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for Surround resistor฀changes฀the฀level฀changes฀can฀be฀ easily฀revised.฀In฀addition,฀provision฀has฀ been฀made฀to฀allow฀the฀LFE฀signal฀to฀be฀ routed฀to฀the฀left฀and฀right฀channels฀during฀ downmix. While฀no฀soldering฀is฀required,฀a฀competent฀technician฀is฀required฀to฀perform฀any฀ changes฀to฀the฀downmix฀function.฀This฀will฀ help฀to฀ensure฀a฀safe฀and฀successful฀modiﬁcation.฀Page฀5฀of฀the฀Model฀74฀schematic฀ contains฀the฀circuitry฀that฀implements฀the฀ downmix฀function.
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for Surround Monitor฀Output฀Gain฀ Structure “Hot”฀Disconnection฀of฀the฀ Model฀75฀Control฀Console The฀Model฀74฀Central฀Controller’s฀monitor฀ outputs฀are฀conﬁgured฀for฀unity฀gain.฀When฀ the฀rotary฀level฀control฀on฀the฀Model฀75฀ Control฀Console฀is฀set฀for฀maximum฀level฀ (fully฀clockwise)฀the฀output฀level฀is฀essentially฀the฀same฀as฀the฀input฀level.฀The฀input฀ trim฀potentiometers฀allow฀precise฀adjustment฀of฀the฀input฀circuitry.
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for Surround nominal฀for฀approximately฀four฀seconds฀ the฀relays฀are฀allowed฀to฀function฀normally.฀Whenever฀the฀AC฀mains฀input฀voltage฀drops฀below฀approximately฀85%฀of฀ nominal฀the฀relays฀immediately฀go฀to฀their฀ mute฀state.฀The฀Model฀74฀will฀stay฀in฀this฀ low-voltage฀state฀unit฀the฀AC฀mains฀voltage฀has฀again฀exceed฀90%฀of฀nominal฀for฀ approximately฀four฀seconds.฀Any฀time฀the฀ Model฀74฀is฀in฀the฀low-voltage฀state฀the฀ power฀LED,฀located฀on฀the฀front฀panel,฀will฀ ﬂash.
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for Surround It฀should฀be฀noted฀that฀the฀infrared฀(IR)฀ remote฀talkback฀circuit฀“tags฀along”฀with฀ the฀hard-wired฀remote฀talkback฀input.฀An฀ IR฀receiver฀module฀connects฀via฀input฀ circuitry฀to฀the฀Model฀74’s฀microcontroller฀ integrated฀circuit.฀Under฀software฀control฀ IR-generated฀requests฀for฀talkback฀are฀ decoded.฀A฀logic฀output฀pin฀on฀the฀microcontroller฀goes฀to฀logic฀high฀(+5฀volts฀ DC)฀whenever฀talkback฀is฀detected.฀This฀ signal฀drives฀the฀input฀of฀an฀optocoupler฀ integrated฀circuit.
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for Surround Speciﬁcations Model฀74฀Central฀Controller General฀Audio: Frequency฀Response:฀20฀Hz-20฀kHz฀±0.1฀dB฀ (down฀0.5฀dB฀@฀60฀kHz),฀monitor฀outputs Distortion฀(THD+N):฀0.
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for Surround Dimensions฀(Overall): 19.00฀inches฀wide฀(48.3฀cm)฀ 1.72฀inches฀high฀(4.4฀cm)฀ 9.58฀inches฀deep฀(24.3฀cm) Mounting:฀one฀space฀(1U)฀in฀a฀standard฀19-inch฀ rack Weight:฀9.5฀pounds฀(4.3฀kg) Model฀75฀Control฀Console Application:฀supports฀Model฀74฀Central฀Controller Power:฀provided฀by฀Model฀74฀Central฀Controller Output฀Data:฀generates฀MIDI฀system-exclusive฀ messages Connector:฀9-pin฀female฀D-subminiature฀(DE-9F) Dimensions฀(Overall): 7.2฀inches฀wide฀(18.3฀cm)฀ 2.2฀inches฀high฀(5.6฀cm)฀ 5.
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for Surround Function:฀Reset฀to฀Power฀Up฀Default฀Conﬁguration Byte฀ Value฀ Description 1฀ F0H฀ System-Exclusive฀Message 2฀ 00H฀ 1st฀Byte฀of฀Studio฀Tech฀ID 3฀ 00H฀ 2nd฀Byte฀of฀Studio฀Tech฀ID 4฀ 56H฀ 3rd฀Byte฀of฀Studio฀Tech฀ID 5฀ 07H฀ Product฀ID฀(Model฀74) 6฀ 00H฀ Function,฀Restore฀Power฀Up฀Default฀Conﬁguration 7฀ F7H฀ EOX,฀End฀of฀System-Exclusive฀Message Notes:฀ ฀ ฀ ฀ ฀ ฀ Action฀taken฀after฀message฀is฀received:฀ Set฀all฀input฀sources฀to฀off.฀ Set฀all฀monitor฀output฀channels฀to฀off.
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for Surround Function:฀Input฀Source฀and฀Associated฀Channels Byte฀ Value฀ Description 1฀ F0H฀ System-Exclusive฀Message 2฀ 00H฀ 1st฀Byte฀of฀Studio฀Tech฀ID 3฀ 00H฀ 2nd฀Byte฀of฀Studio฀Tech฀ID 4฀ 56H฀ 3rd฀Byte฀of฀Studio฀Tech฀ID 5฀ 07H฀ Product฀ID฀(Model฀74) 6฀ 01H฀ Function,฀Input฀Source฀and฀Associated฀Channels 7฀ ฀ ฀ ฀ ฀ 0nH฀ ฀ ฀ ฀ ฀ Input฀Source,฀range฀1-4:฀ 1=Surround฀A฀ 2=Surround฀B฀ 3=Stereo฀A฀ 4=Stereo฀B 8฀ ฀ ฀ ฀ ฀ ฀ ฀ nnH฀ ฀ ฀ ฀ ฀ ฀ ฀ Input฀Channel฀Status฀Bit฀Map฀(sum฀values฀fro
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for Surround Function:฀Monitor฀Output฀Channel฀Status Byte฀ Value฀ Description 1฀ F0H฀ System-Exclusive฀Message 2฀ 00H฀ 1st฀Byte฀of฀Studio฀Tech฀ID 3฀ 00H฀ 2nd฀Byte฀of฀Studio฀Tech฀ID 4฀ 56H฀ 3rd฀Byte฀of฀Studio฀Tech฀ID 5฀ 07H฀ Product฀ID฀(Model฀74) 6฀ 02H฀ Function,฀Monitor฀Output฀Channel฀Status 7฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ nnH฀ ฀ ฀ ฀ ฀ ฀ ฀ ฀ Monitor฀Output฀A฀Channel฀Status฀using฀Output฀Relays฀ Bit฀Map฀(sum฀values฀from฀all฀six฀channels):฀ Channel฀1฀(L):฀off=00;฀on=01฀ Channel฀2฀(R):฀off=00;฀on=02฀
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for Surround Function:฀Monitor฀Output฀Level฀-฀Normal Byte฀ Value฀ Description 1฀ F0H฀ System-Exclusive฀Message 2฀ 00H฀ 1st฀Byte฀of฀Studio฀Tech฀ID 3฀ 00H฀ 2nd฀Byte฀of฀Studio฀Tech฀ID 4฀ 56H฀ 3rd฀Byte฀of฀Studio฀Tech฀ID 5฀ 07H฀ Product฀ID฀(Model฀74) 6฀ 03H฀ Function,฀Monitor฀Output฀Level฀-฀Normal 7฀ nnH฀ Monitor฀Output฀Level,฀MSB,฀range฀00-7F 8฀ 0nH฀ Monitor฀Output฀Level,฀LSB,฀range฀0-1 9฀ F7H฀ EOX,฀End฀of฀System-Exclusive฀Message Notes:฀ Control฀console฀sends฀new฀value฀each฀time฀
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for Surround Function:฀Monitor฀Output฀Level฀-฀Reverse Byte฀ Value฀ Description 1฀ F0H฀ System-Exclusive฀Message 2฀ 00H฀ 1st฀Byte฀of฀Studio฀Tech฀ID 3฀ 00H฀ 2nd฀Byte฀of฀Studio฀Tech฀ID 4฀ 56H฀ 3rd฀Byte฀of฀Studio฀Tech฀ID 5฀ 07H฀ Product฀ID฀(Model฀74) 6฀ 04H฀ Function,฀Monitor฀Output฀Level฀-฀Reverse 7฀ nnH฀ Monitor฀Output฀Level,฀MSB,฀range฀00-7F 8฀ 0nH฀ Monitor฀Output฀Level,฀LSB,฀range฀0-1 9฀ F7H฀ EOX,฀End฀of฀System-Exclusive฀Message Notes:฀ Not฀sent฀by฀control฀console.
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for Surround Function:฀Stereo฀to฀Mono฀Downmix Byte฀ Value฀ Description 1฀ F0H฀ System-Exclusive฀Message 2฀ 00H฀ 1st฀Byte฀of฀Studio฀Tech฀ID 3฀ 00H฀ 2nd฀Byte฀of฀Studio฀Tech฀ID 4฀ 56H฀ 3rd฀Byte฀of฀Studio฀Tech฀ID 5฀ 07H฀ Product฀ID฀(Model฀74) 6฀ 05H฀ Function,฀Stereo฀to฀Mono฀Downmix 7฀ ฀ ฀ ฀ ฀ 0nH฀ ฀ ฀ ฀ ฀ Status,฀range฀0-3:฀ 0=off฀ 1=on,฀L+R฀sent฀to฀left฀and฀right฀channels฀of฀monitor฀output฀ 2=on,฀L+R฀sent฀to฀center฀channel฀of฀monitor฀output฀ 3=on,฀Bandpassed฀L+R฀sent฀to฀center฀channel฀
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for Surround Function:฀5.1฀to฀Stereo฀Downmix Byte฀ Value฀ Description 1฀ F0H฀ System-Exclusive฀Message 2฀ 00H฀ 1st฀Byte฀of฀Studio฀Tech฀ID 3฀ 00H฀ 2nd฀Byte฀of฀Studio฀Tech฀ID 4฀ 56H฀ 3rd฀Byte฀of฀Studio฀Tech฀ID 5฀ 07H฀ Product฀ID฀(Model฀74) 6฀ 06H฀ Function,฀5.1฀to฀Stereo฀Downmix 7฀ ฀ ฀ 0nH฀ ฀ ฀ Status,฀range฀0-1:฀ 0=off฀ 1=on 8฀ F7H฀ EOX,฀End฀of฀System-Exclusive฀Message Issue฀3,฀November฀2016฀ Page฀52฀ Model฀74/75฀User฀Guide฀ Studio฀Technologies,฀Inc.
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for Surround Function:฀Cue฀Audio Byte฀ Value฀ Description 1฀ F0H฀ System-Exclusive฀Message 2฀ 00H฀ 1st฀Byte฀of฀Studio฀Tech฀ID 3฀ 00H฀ 2nd฀Byte฀of฀Studio฀Tech฀ID 4฀ 56H฀ 3rd฀Byte฀of฀Studio฀Tech฀ID 5฀ 07H฀ Product฀ID฀(Model฀74) 6฀ 07H฀ Function,฀Cue฀Audio 7฀ ฀ ฀ ฀ 0nH฀ ฀ ฀ ฀ Cue฀Audio฀Source:฀ 0=No฀Source฀ 1=Stereo฀B฀ 2=Source฀follows฀L/R฀Output 8฀ F7H฀ EOX,฀End฀of฀System-Exclusive฀Message Model฀74/75฀User฀Guide฀ Studio฀Technologies,฀Inc.
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for Surround Function:฀Talkback Byte฀ Value฀ Description 1฀ F0H฀ System-Exclusive฀Message 2฀ 00H฀ 1st฀Byte฀of฀Studio฀Tech฀ID 3฀ 00H฀ 2nd฀Byte฀of฀Studio฀Tech฀ID 4฀ 56H฀ 3rd฀Byte฀of฀Studio฀Tech฀ID 5฀ 07H฀ Product฀ID฀(Model฀74) 6฀ 08H฀ Function,฀Talkback฀ 7฀ 0nH฀ Talkback฀Level,฀range฀0-7,฀7฀is฀loudest 8฀ ฀ ฀ ฀ 0nH฀ ฀ ฀ ฀ Talkback฀Status:฀ n=0฀฀ Off฀ n=1฀ On,฀Source฀is฀Model฀75฀Mic฀ n=2฀ On,฀Source฀is฀Line-Level฀Talkback฀Input 9฀ F7H฀ EOX,฀End฀of฀System-Exclusive฀Message Issue฀3,
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ALL MONI TOR OUTPUTS +4dBu NOMI NAL DI FFERENTI AL LI NE RECEI VER ADJ USTABLE GAI N BUFFER LEVEL CONTROL BUFFER DI FFERENTI AL LI NE DRI VER L L VCA TRI M R R SURROUND I NPUT A ( - 12dBV TO +6dBu) 5.
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