Extron Electronics, USA1230 South Lewis StreetAnaheim, CA 92805800.633.9876 714.491.1500 FAX 714.491.1517

Extron Electronics, EuropeBeeldschermweg 6C 3821 AH Amersfoort, The Netherlands+800.3987.6673 +31.33.453.4040 FAX +31.33.453.4050

Extron Electronics, Asia135 Joo Seng Rd. #04-01PM Industrial Bldg.Singapore 368363+65.6383.4400 FAX +65.6383.4664

Extron Electronics, JapanDaisan DMJ Bldg. 6F, 3-9-1 Kudan MinamiChiyoda-ku, Tokyo 102-0074 Japan+81.3.3511.7655 FAX +81.3.3511.7656

03-1068-894-01REV. A© 2003 Extron Electronics. All rights reserved. All trademarks mentioned are the property of their respective owners.

n Volume and tone control via RS-232or front panel

n Four mono or two stereo audiochannels

n Balanced or unbalanced audioinputs and outputs

n Three presets per channel for– volume – input gain – bass – treble

n Compatible with professional leveland consumer level signals

n 1U, quarter rack width metalenclosure

n Includes external internationalpower supply for worldwide powercompatibility

RAC 104

SIGNAL PROCESSORS

FOUR CHANNEL REMOTE VOLUME AND TONE CONTROLLER

The Extron RAC 104 is a high performance four channel volume and tone

controller with RS-232. It can be economically integrated into small mono and

stereo audio systems to remotely control volume, bass, and treble.

Extron SW 6AV Switcher

RAC 104

ON

INPUTS

OUTPUTS

LINE LEVEL

IN

AB

ABOUT

+4 dBu

-10 dBV

Tx Rx

RS-232

POWER

12V

0 2A MAX

A1

2

B3

4

A1

2

B3

4

V

H

REMOTE

R

R

R

R

R

R

R

R

INPUTS

OUTPUTS

5

2

1

3

4

A

6

BSW

6AV

INPUTS

OUTPUTSSYNC

IN

12

34

56

AB

OUT

Audio Amplifier

ProgramSpeaker

70V Audio Amplifier

70V Audio Amplifier

Mixer

RS-232ControlMicrophone

Zone 2

Ceiling Speakers

ProgramSpeaker

Extron RAC 104 Volume and ToneController

Zone 1

APPLICATION DIAGRAM

PANEL DRAWINGS

www.extron.com

VOLUME & TONE CONTROLLER

RAC 104

12

34

BASSTREBLE

VOL

ADJUSTMENTSAUDIO CONTROLS

A B

RAC 104

ON

INPUTS

OUTPUTSLINE LEVEL

INA B A B

OUT

+4 dBu

-10 dBV

Tx Rx

RS-232

POWER12V 0.2A MAX

A1 2 B3 4

A1 2 B3 4

Front

Back

Four-Channel Application (2 front program speakers & 2 zone

distributed ceiling speakers)

P

Ceiling Speakers

(Lower volume less delay)

(Higher volume more delay)

Program Speakers

Ball Room Top View

Ch 1

Ch 3

Ch 4

Ch 2

SPECIFICATIONSDESCRIPTION

FEATURES

AUDIOGain............................................ Unbalanced output: -6dB; balanced

output: 0dB when input gain is set to0dB, output volume is at 100, and theinput and output are set to the samelevel via the Line Level DIP switch

Frequency response .................... 20 Hz to 20 kHz, ±0.05dBTHD + Noise .............................. 0.03% @ 1 kHz at nominal levelS/N ............................................ >90dB, balanced at rated maximum

outputCrosstalk .................................... <-120dB @ 1 kHzStereo channel separation .......... >80dB @ 1 kHz, >60dB @ 20 kHzCMRR ........................................ >75dB @ 20 Hz to 20 kHzVolume control range ................ -100dB to 0dB (volume numbers

0 through 100) in 0.5dB stepsNOTE: Attenuation = volume number minus 100.

The default is -30dB = volume number 70.Bass control range ...................... ±14dB, 100 Hz referenced to 1 kHz

(0 through 14) in 2dB stepsNOTE: Bass dB = (bass number minus 7) times 2.

The default is 0dB = bass number 7.Treble control range.................... ±14dB, 10 kHz referenced to 1 kHz

(0 through 14) in 2dB stepsNOTE: Treble dB = (treble number minus 7) times 2.

The default is 0dB = treble number 7.

AUDIO INPUTNumber/signal type.................... 4 channels, which can be mono or tied

into stereo pairs, balanced/unbalancedConnectors ................................ (2) 3.5 mm captive screw connectors,

5 poleImpedance.................................. >25 kohms unbalanced, 50 kohms

balanced, DC coupledNominal level.............................. +4dBu (1.23V), -10dBV (316mV),

switchable per groupMaximum level .......................... +20dBu (7.75V), (balanced or

unbalanced) at 1%THD+NInput gain adjustment ................ –12dB to +12dB

AUDIO OUTPUTNumber/signal type.................... 4 channels, which can be mono or tied

into stereo pairs, balanced/unbalancedConnectors ................................ (2) 3.5 mm captive screw connector,

5-poleImpedance.................................. 50 ohms unbalanced, 100 ohms

balancedNominal level.............................. +4dBu (1.23V), balanced; -10dBV

(316mV), unbalanced; switchable pergroup

Maximum level (Hi-Z) ................ >+20dBu, balanced or unbalanced at1%THD+N

NOTE: 0dBu = 0.775V, 0dBV = 1V, 0dB≈2dBu.

CONTROL/REMOTE — REMOTE VOLUME/TONE CONTROLLER

Serial control port ...................... RS-232, 3.5 mm captive screwconnector, 3 pole

Baud rate and protocol .............. 9600, 8-bit, 1 stop bit, no paritySerial control pin configurations .. 1 = TX, 2 = RX, 3 = GNDProgram control.......................... Extron’s control program for Windows®

Extron’s Simple Instruction Set™ – SIS™

GENERALPower ........................................ 100VAC to 240VAC, 50/60 Hz, external,

autoswitchable; to 12VDC, 1 A powersupply. Product requires 0.2 A.

Temperature/humidity ................ Storage -40° to +158°F (-40° to +70°C) /10% to 90%, non-condensing Operating+32° to +122°F (0° to +50°C) / 10% to90%, non-condensing

Rack mount ................................ Yes, with optional rack shelf, part #60-190-01 or 60-190-20, orfurniture mountable with optionalbrackets

Enclosure type ............................ MetalEnclosure dimensions.................. 1.7" H x 4.3" W x 3.0" D (1U high,

quarter rack width) 4.3 cm H x 10.9 cm W x 7.6 cm D (Depth excludesconnectors and knob.)

Product weight .......................... 0.5 lbs (0.3 kg)Shipping weight ........................ 2 lbs (1 kg)Vibration .................................... ISTA/NSTA 1A in carton (International

Safe Transit Association)Listings ...................................... UL, CULCompliances .............................. CE, FCC Class A, VCCI, AS/NZS, ICES MTBF .......................................... 30,000 hoursWarranty .................................... 3 years parts and labor

Model Part NumberRAC 104 .................................... 60-561-01

Specifications are subject to change without notice.

Four-Channel Application (2 front program speakers & 2 channel

distributed ceiling speakers)

F

Ceiling Speakers

Program Speakers

Meeting Room Top View

Ch 1

Ch 3 Ch 4

Ch 2

Ceiling Speakers

Three-Channel Application (2 front program speakers & 1 channel

distributed ceiling speakers)

F

Program Speakers

Class Room Top View

Ch 1

Ch 3

Ch 2

DIAGRAMS

Two-Channel Application (2 front program speakers)

Program Speakers

Class Room Top View

Ch 1 Ch 2

The Extron RAC 104 is a four channel remote volume and tonecontroller. It provides four channels for controlling volume, bass, andtreble when placed between a switcher and an audio amplifier. TheRAC 104 can be configured for a variety of applications to controlmono and stereo audio distribution in such environments as smallclassrooms and meeting rooms.

The RAC 104 offers simple, intuitive operation and features twochannel selection buttons (two channels per button) withcorresponding LED indicators. It provides direct access to volume, bassand treble adjustments using a front panel adjustment knob. All inputsand outputs of the RAC 104 are on captive screw connectors forbalanced and unbalanced line level audio signals, facilitatingintegration-friendly installation. Part of the VersaTools™ line of small,integrator friendly products, the RAC 104 is housed in a 1U, quarterrack width metal enclosure, and is rack-, under-desk-, and/or through-desk-mountable.

n RS-232 control – A rear panel, captive screw port provides RS-232 connectivity of the RAC 104 to remotely control volume,bass, and treble adjustments.

n Stereo or mono audio systems – The RAC 104 offers the flexibilityto control two stereo or four mono audio channels in a system.

n Smooth volume control – Adjustments are made in 0.5 dBincrements, ensuring smooth transitions when changing volumelevels.

n Three presets per channel – Input gain/attenuation audio levels plusvolume, bass, and treble can be saved on three presets per channel.As presets, these settings can be quickly recalled and deployed duringpresentations.

n Compatible with any audio amplifier – For small balanced andunbalanced audio system integration, the RAC 104 includes volumecontrol for most audio equipment.

n Professional and consumer audio I/O levels (DIP switch-selectable) – Compatibility with both professional (+4dBu) andconsumer (-10dBV) level audio enables the RAC 104 to mix andmatch many types of audio peripherals.

n Flexible mounting options – The RAC 104 is housed in a 1U,quarter rack width metal enclosure and can be mounted under orthrough a desk or in a rack.

n External international power supply – The included autoswitchableexternal power supply provides worldwide power compatibility.

The RAC 104 offers the versatility and functionality to complementa variety of applications.

ClassroomTwo Channel Application

(2 front program speakers)

ClassroomThree Channel Application

(Two front program speakers & onechannel for distributed ceiling speakers)

Meeting RoomFour Channel Application

(two front program speakers & twochannels for distributed ceiling speakers)

BallroomFour Channel Application

(Two front program speakers & twozone distributed ceiling speakers)

Four-Channel Application (2 front program speakers & 2 zone

distributed ceiling speakers)

P

Ceiling Speakers

(Lower volume less delay)

(Higher volume more delay)

Program Speakers

Ball Room Top View

Ch 1

Ch 3

Ch 4

Ch 2

SPECIFICATIONSDESCRIPTION

FEATURES

AUDIOGain............................................ Unbalanced output: -6dB; balanced

output: 0dB when input gain is set to0dB, output volume is at 100, and theinput and output are set to the samelevel via the Line Level DIP switch

Frequency response .................... 20 Hz to 20 kHz, ±0.05dBTHD + Noise .............................. 0.03% @ 1 kHz at nominal levelS/N ............................................ >90dB, balanced at rated maximum

outputCrosstalk .................................... <-120dB @ 1 kHzStereo channel separation .......... >80dB @ 1 kHz, >60dB @ 20 kHzCMRR ........................................ >75dB @ 20 Hz to 20 kHzVolume control range ................ -100dB to 0dB (volume numbers

0 through 100) in 0.5dB stepsNOTE: Attenuation = volume number minus 100.

The default is -30dB = volume number 70.Bass control range ...................... ±14dB, 100 Hz referenced to 1 kHz

(0 through 14) in 2dB stepsNOTE: Bass dB = (bass number minus 7) times 2.

The default is 0dB = bass number 7.Treble control range.................... ±14dB, 10 kHz referenced to 1 kHz

(0 through 14) in 2dB stepsNOTE: Treble dB = (treble number minus 7) times 2.

The default is 0dB = treble number 7.

AUDIO INPUTNumber/signal type.................... 4 channels, which can be mono or tied

into stereo pairs, balanced/unbalancedConnectors ................................ (2) 3.5 mm captive screw connectors,

5 poleImpedance.................................. >25 kohms unbalanced, 50 kohms

balanced, DC coupledNominal level.............................. +4dBu (1.23V), -10dBV (316mV),

switchable per groupMaximum level .......................... +20dBu (7.75V), (balanced or

unbalanced) at 1%THD+NInput gain adjustment ................ –12dB to +12dB

AUDIO OUTPUTNumber/signal type.................... 4 channels, which can be mono or tied

into stereo pairs, balanced/unbalancedConnectors ................................ (2) 3.5 mm captive screw connector,

5-poleImpedance.................................. 50 ohms unbalanced, 100 ohms

balancedNominal level.............................. +4dBu (1.23V), balanced; -10dBV

(316mV), unbalanced; switchable pergroup

Maximum level (Hi-Z) ................ >+20dBu, balanced or unbalanced at1%THD+N

NOTE: 0dBu = 0.775V, 0dBV = 1V, 0dB≈2dBu.

CONTROL/REMOTE — REMOTE VOLUME/TONE CONTROLLER

Serial control port ...................... RS-232, 3.5 mm captive screwconnector, 3 pole

Baud rate and protocol .............. 9600, 8-bit, 1 stop bit, no paritySerial control pin configurations .. 1 = TX, 2 = RX, 3 = GNDProgram control.......................... Extron’s control program for Windows®

Extron’s Simple Instruction Set™ – SIS™

GENERALPower ........................................ 100VAC to 240VAC, 50/60 Hz, external,

autoswitchable; to 12VDC, 1 A powersupply. Product requires 0.2 A.

Temperature/humidity ................ Storage -40° to +158°F (-40° to +70°C) /10% to 90%, non-condensing Operating+32° to +122°F (0° to +50°C) / 10% to90%, non-condensing

Rack mount ................................ Yes, with optional rack shelf, part #60-190-01 or 60-190-20, orfurniture mountable with optionalbrackets

Enclosure type ............................ MetalEnclosure dimensions.................. 1.7" H x 4.3" W x 3.0" D (1U high,

quarter rack width) 4.3 cm H x 10.9 cm W x 7.6 cm D (Depth excludesconnectors and knob.)

Product weight .......................... 0.5 lbs (0.3 kg)Shipping weight ........................ 2 lbs (1 kg)Vibration .................................... ISTA/NSTA 1A in carton (International

Safe Transit Association)Listings ...................................... UL, CULCompliances .............................. CE, FCC Class A, VCCI, AS/NZS, ICES MTBF .......................................... 30,000 hoursWarranty .................................... 3 years parts and labor

Model Part NumberRAC 104 .................................... 60-561-01

Specifications are subject to change without notice.

Four-Channel Application (2 front program speakers & 2 channel

distributed ceiling speakers)

F

Ceiling Speakers

Program Speakers

Meeting Room Top View

Ch 1

Ch 3 Ch 4

Ch 2

Ceiling Speakers

Three-Channel Application (2 front program speakers & 1 channel

distributed ceiling speakers)

F

Program Speakers

Class Room Top View

Ch 1

Ch 3

Ch 2

DIAGRAMS

Two-Channel Application (2 front program speakers)

Program Speakers

Class Room Top View

Ch 1 Ch 2

The Extron RAC 104 is a four channel remote volume and tonecontroller. It provides four channels for controlling volume, bass, andtreble when placed between a switcher and an audio amplifier. TheRAC 104 can be configured for a variety of applications to controlmono and stereo audio distribution in such environments as smallclassrooms and meeting rooms.

The RAC 104 offers simple, intuitive operation and features twochannel selection buttons (two channels per button) withcorresponding LED indicators. It provides direct access to volume, bassand treble adjustments using a front panel adjustment knob. All inputsand outputs of the RAC 104 are on captive screw connectors forbalanced and unbalanced line level audio signals, facilitatingintegration-friendly installation. Part of the VersaTools™ line of small,integrator friendly products, the RAC 104 is housed in a 1U, quarterrack width metal enclosure, and is rack-, under-desk-, and/or through-desk-mountable.

n RS-232 control – A rear panel, captive screw port provides RS-232 connectivity of the RAC 104 to remotely control volume,bass, and treble adjustments.

n Stereo or mono audio systems – The RAC 104 offers the flexibilityto control two stereo or four mono audio channels in a system.

n Smooth volume control – Adjustments are made in 0.5 dBincrements, ensuring smooth transitions when changing volumelevels.

n Three presets per channel – Input gain/attenuation audio levels plusvolume, bass, and treble can be saved on three presets per channel.As presets, these settings can be quickly recalled and deployed duringpresentations.

n Compatible with any audio amplifier – For small balanced andunbalanced audio system integration, the RAC 104 includes volumecontrol for most audio equipment.

n Professional and consumer audio I/O levels (DIP switch-selectable) – Compatibility with both professional (+4dBu) andconsumer (-10dBV) level audio enables the RAC 104 to mix andmatch many types of audio peripherals.

n Flexible mounting options – The RAC 104 is housed in a 1U,quarter rack width metal enclosure and can be mounted under orthrough a desk or in a rack.

n External international power supply – The included autoswitchableexternal power supply provides worldwide power compatibility.

The RAC 104 offers the versatility and functionality to complementa variety of applications.

ClassroomTwo Channel Application

(2 front program speakers)

ClassroomThree Channel Application

(Two front program speakers & onechannel for distributed ceiling speakers)

Meeting RoomFour Channel Application

(two front program speakers & twochannels for distributed ceiling speakers)

BallroomFour Channel Application

(Two front program speakers & twozone distributed ceiling speakers)

Extron Electronics, USA1230 South Lewis StreetAnaheim, CA 92805800.633.9876 714.491.1500 FAX 714.491.1517

Extron Electronics, EuropeBeeldschermweg 6C 3821 AH Amersfoort, The Netherlands+800.3987.6673 +31.33.453.4040 FAX +31.33.453.4050

Extron Electronics, Asia135 Joo Seng Rd. #04-01PM Industrial Bldg.Singapore 368363+65.6383.4400 FAX +65.6383.4664

Extron Electronics, JapanDaisan DMJ Bldg. 6F, 3-9-1 Kudan MinamiChiyoda-ku, Tokyo 102-0074 Japan+81.3.3511.7655 FAX +81.3.3511.7656

03-1068-894-01REV. A© 2003 Extron Electronics. All rights reserved. All trademarks mentioned are the property of their respective owners.

n Volume and tone control via RS-232or front panel

n Four mono or two stereo audiochannels

n Balanced or unbalanced audioinputs and outputs

n Three presets per channel for– volume – input gain – bass – treble

n Compatible with professional leveland consumer level signals

n 1U, quarter rack width metalenclosure

n Includes external internationalpower supply for worldwide powercompatibility

RAC 104

SIGNAL PROCESSORS

FOUR CHANNEL REMOTE VOLUME AND TONE CONTROLLER

The Extron RAC 104 is a high performance four channel volume and tone

controller with RS-232. It can be economically integrated into small mono and

stereo audio systems to remotely control volume, bass, and treble.

Extron SW 6AV Switcher

RAC 104

ON

INPUTS

OUTPUTS

LINE LEVEL

IN

AB

ABOUT

+4 dBu

-10 dBV

Tx Rx

RS-232

POWER

12V

0 2A MAX

A1

2

B3

4

A1

2

B3

4

V

H

REMOTE

R

R

R

R

R

R

R

R

INPUTS

OUTPUTS

5

2

1

3

4

A

6

BSW

6AV

INPUTS

OUTPUTSSYNC

IN

12

34

56

AB

OUT

Audio Amplifier

ProgramSpeaker

70V Audio Amplifier

70V Audio Amplifier

Mixer

RS-232ControlMicrophone

Zone 2

Ceiling Speakers

ProgramSpeaker

Extron RAC 104 Volume and ToneController

Zone 1

APPLICATION DIAGRAM

PANEL DRAWINGS

www.extron.com

VOLUME & TONE CONTROLLER

RAC 104

12

34

BASSTREBLE

VOL

ADJUSTMENTSAUDIO CONTROLS

A B

RAC 104

ON

INPUTS

OUTPUTSLINE LEVEL

INA B A B

OUT

+4 dBu

-10 dBV

Tx Rx

RS-232

POWER12V 0.2A MAX

A1 2 B3 4

A1 2 B3 4

Front

Back