Paso Sound T3115BGM User Manual

®

Integrated Amplifiers

© copyright Paso Sound Products, Inc. 2005 Specifications are subject to change without notice

Innovation through technology since 1931

Manual

OOMM 116677

Installation Manual

and Operating Instructions

4 Channel - 2 Zone - VOX -MOH -

Phone Interface

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SSHHOOCCKK DDOO NNOOTT EEXXPPOOSSEE TTHHIISS AAPPPPLLIIAANNCCEE TTOO

WWAATTEERR,, RRAAIINN OORR MMOOIISSTTUURRE

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CAUTION !

REV. 4.0

IMPORTANT NOTE:

THIS OPERATING MANUAL IS PROVIDED AS AN INSTALLATION AND
AS AN OPERATING AID. PASO SOUND PRODUCTS, INC. DOES NOT ASSUME ANY
RESPONSIBILITY AS TO ITS ACCURACY AND SHALL NOT BE LIABLE IN TORT OR CON­TRACT FOR ANY DIRECT CONSEQUENTIAL OR INCIDENTAL LOSS OR DAMAGE ARISING
FROM THE INSTALLATION, USE OR INABILITY TO USE THIS PRODUCT.

TT33111155BBGGMM -- 1155 WWaatttt RRMMSS

TT33113300BBGGMM -- 3300 WWaatttt RRMMSS

SSeerriieess 33000000

PROFESSIONAL AUDIO & SOUND

®

DESCRIPTION AND APPLICATIONS SPECIFICATIONS

PAGE 2

© copyright Paso Sound Products, Inc. 2005 Specifications are subject to change without notice

T3115/3130/3160BGM

UNPACKING

Immediately upon receipt of the amplifier, inspect the unit
and shipping container for indications of improper handling
or in transit damage. The equipment was carefully inspect­ed and tested before leaving the factory. Notify the
Transportation Company immediately if any damage is
found. ONLY THE CONSIGNEE CAN FILE A CLAIM WITH
THE CARRIER FOR DAMAGE DURING SHIPMENT. Be
sure to save the carton and packing material as evidence of
damage for the shipper inspection. DO NOT SHIP the unit
back to the factory unless authorized by the factory.

IN TRANSIT DAMAGES ARE NOT COVERED BY THE
PASO WARRANTY.



4 Channel Inputs - 2 Zone Outputs



Wide Frequency Response

Very Low Distortion



Balanced Microphone Input



Phantom Power on MIC Input with Selector



Transformer Balanced Phone Paging Input



Telephone Input Level Control



Auxiliary Input With Stereo Summing



Auxiliary Input Attenuator



Balanced Program Input



Independent Input Controls

Bass and Treble Controls



VOX - Voice Activated Muting



Direct Muting or Unmuting



600 ohm and 8 ohm 1 Watt

Music on Hold Amplifier



MOH Amplifier Source Selector



Zone 2, 1 Watt - 8 ohm Output

with Separate Control



AC Accessory Outlet



8 ohm, 25 Volt & 70 Volt

Output Impedance



Rack Mounting with Optional Kit



UL 6500 Listed (US - CANADA)

INTEGRATED AMPLIFIERS

T3115 Power Output:
T3130 Power Output:
Distortion:
Frequency Response:
Inputs:

Input 1
Input 2
Input 3
Input 4

Sensitivity & Z:

Input 1
Input 2
Input 3

Input 4
Hum & Noise:
Telephone Input:
Music on Hold Output:
Zone 2 Output:
Output Impedance:
Controls:

Front Panel:

Rear Panel

Phantom Power:
MOH Source:
Tone Control Action:
VOX:

Muting/Unmuting:

Rack Mounting:
Power Requirement:

Power Consumption:
AC Accessory Outlet:
Terminations:
Housing Finish:
Dimensions:

Net Weight:

15 Watt RMS
30 Watt RMS
Less than 0.5% THD
20 - 20,000 Hz ± 1 db

Microphone Balanced
Telephone Transformer Balanced
Auxiliary
Program Balanced

Mic

=1 Mv - 250 ohm balanced

Te l

=100 Mv - 600 ohm balanced

Aux

=100 Mv - 47K ohm

Prog.

=1 Volt - 10K ohm balanced

Mic

-70 db,

Aux/Pgm

-75 db
600 ohm Transformer balanced
600 ohm-1 Volt Transf. balanced
1 Watt-8 ohm
8 ohm, 25 Volt and 70 Volt line

MIC Volume, AUX Volume,
PROG Volume, Bass, Treble
PHONE Level, AUX Attenuator,
MOH & ZONE 2 Level Control
On MIC Input w/internal jumper
AUX or PROG w/internal jumper
+/-10 db at 100 Hz and 10 K hz
Voice Activated Muting
MIC/PHONE mutes AUX/PROG
Mutes or Unmutes
MIC/AUX/PROG
Optional Rack Kit
117 Volt, 50-60 Hz

T3115 = 570 VA, T3130 = 600 VA
500 W Max. Unswitched
Screw Terminals, RCA Jacks
Black

10.5"W., 9.5"D., 3.5"H.

(267X242X89 mm)

T3115 = 8 Lbs

(3.7 Kg)

T3130 = 11 Lbs

(5.0 Kg)

27/3500 - Standard 19” Rack Mounting Kit. Black finish.
Complete with hardware

ACCESSORIES

PROFESSIONAL AUDIO & SOUND

PAGE 3

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICET3115/3130/3160BGM

RACK MOUNTING

READ BEFORE OPERATING READ BEFORE OPERATING

BEFORE OPERATING THE AMPLIFIER, BE SURE YOU
FULLY UNDERSTAND ALL INSTRUCTIONS AND FEA­TURES OF THE UNIT.

1)

Read these instructions carefully.

2)

Keep these instructions.

3)

Heed all Warnings.

4)

Follow all instructions.

5) DO NOT use this apparatus near water.

6) Clean ONLY with a damp cloth.

7) DO NOT block any of the ventilation openings.

Install in accordance with the instructions provided.

8) DO NOT install near any heat sources such as
radiators, stoves, or other apparatus (including ampli­fiers) that produce heat.

9) DO NOT mount amplifier into a container or a
closed unventilated closet while operating.

10) DO NOT place any object or accessory equipment
such as Tuners, Mixers, Cassette Decks, etc. on top of
the amplifier. Obstructing or closing the cabinet venti­lation openings may cause overheating.

11) DO NOT defeat the safety purpose of the polar­ized or grounding type plug. A polarized plug has two
blades with one wider than the other. A grounding type
plug has two blades and a third grounding prong. The
wide blade and or the third prong is provided for your
safety. When the provided plug does not fit into your

outlet, consult an electrician for replacement of the
obsolete outlet.

12) Use only the attachments and accessories speci­fied in this manual.

13) If a cart is used, use caution when moving the
cart/apparatus combination to avoid injury from tip­over.

14) Unplug this apparatus during lighting storms or
when unused for long periods of time.

15) Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as power supply cord or
plug is damaged, liquid has been spilled or objects
have fallen into the apparatus, the apparatus has been
exposed to rain or moisture, does not operate normal­ly, or has been dropped.

16) DO NOT replace fuses unless power cord is
removed from the AC wall outlet.

17) DO NOT install accessories unless the power
cord is removed from the AC wall outlet.

TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK DO NOT EXPOSE
THIS APPLIANCE TO WATER, RAIN OR
MOISTURE

IMPORTANT SAFETY INSTRUCTIONS

PROFESSIONAL AUDIO & SOUND

INTEGRATED AMPLIFIERS

A) Procure the optional accessory Rack Mount Kit.
B) Turn amplifier up side down and remove the four rubber feet by unscrewing the four holding screws.
C) Remove three screws on each side of the amplifier holding the amplifier cover.
D) Install the rack kit brackets by using the self-tapping screws provided and the screws removed as per C.

Fig. 3 - Rack Kit Mounting

®

6

1

.

0

3000

7

.

.

8

.

9

4

3

.

.

2

.

1

.

0

INTEGRATED AMPLIFIER

5

.

6

..

7

.

.

8

.

9

.

10

AUX

4

3

.

.

2

.

1

.

0

PROGRAM

5

.

6

..

.

0

.

1

1

7

.

.

.

9

10

..

.

2

.

8

3

.

.

.

5

-

BASS

0

.

.

1

1

.

.

2

2

.

2

.

3

.

44

5
+

.

.

.

3

3

.

44

.

-

.

5

TREBLE

5

.

+

O

POWER

3115rack mount

SERIES

3

.

.

2

.

1

0

5

.

4

..

.

MIC

®

PAGE 4

Specifications are subject to change without notice

T3115/3130/3160BGM

INTEGRATED AMPLIFIERS

FRONT PANEL CONTROLS

REAR PANEL INPUTS - OUTPUTS

1) MICROPHONE Input Volume Control

2) AUX Volume Control

3) PROGRAM Volume Control

4) Bass Control

5) Treble Control

6) On-Off Power Switch

1) Unswitched AC Auxiliary Socket

2) 600 ohm MOH Output

3) 1 Watt 8 ohm Output (2nd zone or MOH)

4) MOH Output Level

5) AUX Input

6) AUX Input Level Attenuator

7) TEL Output Level Control

8) Balanced Telephone Paging Input

9) Balanced Microphone Input

10) Balanced Program Input

11) Mute/Unmute Terminals

12) Speaker Output

13) Chassis Ground Screw

14) AC Line Fuse

15) AC Power Cord

Fig. 4 - Front Panel Controls

Fig. 4A - Rear Panel Inputs and Outputs

PROFESSIONAL AUDIO & SOUND

SERIES

3000

5

.

4

6

.

.

3

.

.

2

.

1

3115cont

.

0

3

7

.

.

2

.

8

.

1

9

.

10

MIC PROGRAM BASS TREBLE POWER

1

INTEGRATED AMPLIFIER

5

.

4

6

.

.

.

7

.

.

8

.

.

9

.

.

0

10

AUX

2 3 4 5 6

1

CAUTION; TO REDUCE THE RISK OF FIRE OR SHOCK DO NOT
EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. DO NOT
REMOVE COVER. THERE ARE NO USER SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

117V 60 Hz

POWER RATING
SUPPLY VOLTAGE

POWER CONSUMPTION

CAUTION: TO REDUCE THE RISK OF FIRE,
REPLACE ONLY WITH SAMETYPE OF

LINE FUSE

1.6A 250 V

FUSE.

ATTENTION: AFIN DE
REDUIR LE RISQUE
D©INCENDIE, REMPLACER
SEUL PAR UN FUSIBLE DE
MEME TYPE.

500 W MAX.

UNSWITCHED

ATTENTION: POUR REDUIRLES RISQUES D© INCENDIE OU
DE CHOC ELECTRIQUE, NE PAS EXPOSER A LA PLUIE OU
L©HUMIDITE, NE PAS ENLEVER LE COUVERCLE. AUCUN
REGLAGE A L©INTERIEUR. POUR REPARATION
CONSULTERUNE PERSONNE QUALIFIEE

T3115BGM

AMPLIFIER

GROUND

5

.

4

6

.

.

3

.

7

.

.

2

1

.

8

.

.

9

.

.

0

10

0

.

.

1

1

.

.

.

2

.

3

2

.

3

3

.

.

44

.

.

-5

5+

15 W RMS

117V 60 HZ

570 VA

COM 70V

8 25V

CLASS 2 WIRING ACCEPTABLE

SER. NO.

®

PROFESSIONAL AUDIO & SOUND

0

.

.

1

1

.

.

2

.

.

2

.

3

.

.

44

.

.

-5

5+

MOH OUTPUT

600 ohm

8 OHM

1 Volt

1 WATT

MUTE

O

6

52 3 4

AUX

47K ohm 200 Mv

IN PARALLEL

L

MOH OUTPUT

LEVEL

R

10K OHM

1 V

BALANCED BALANCED BALANCED

250 OHM

1 MV

AUX

ATTENUATOR

600 OHM

100 MV

GHOTCOMGHOTCOMGHOTCOMUNMUTE G

TEL OUTPUT

LEVEL

TELMICPROGRAM

7

3115inou

131415

12

11 10 9 8

PAGE 5

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICET3115/3130/3160BGM

INSTALLATION AND WIRING

PROFESSIONAL AUDIO & SOUND

INTEGRATED AMPLIFIERS

INPUT CONNECTIONS

MICROPHONE INPUT

MICROPHONE TYPE

The Microphone Input accept Low Impedance (250-600 ohm)
Microphones. The Microphone may be a balanced output type
(three wire) or an unbalanced output type (two wire).

PASO MICROPHONES

All PASO low impedance Microphones have a balanced output for
best performance. Connect the RED lead to terminal HOT, the
WHITE lead to terminal COM and the SHIELD to terminal G (see
Fig. 5A).

CAUTION

TO PREVENT POSSIBLE DAMAGE TO SPEAKERS OR THE
AMPLIFIER ALL INPUT CONNECTIONS MUST BE MADE WITH
THE AMPLIFIER OFF (POWER OFF).

WIRING

CABLE

Fig. 5 Amplifier Rear Panel View

Fig. 5A - Rear Panel MIC Input Terminals

MICROPHONE INPUT

Attach the microphone leads to the terminal strip as per diagram
in Fig 5A or Fig. 5B.

DO NOT GROUND THE MICROPHONE CABLE SHIELD TO THE
CHASSIS OF THE AMPLIFIER

Fig. 5B - Rear Panel MIC Input Terminals

BALANCED MICROPHONE

IMPORTANT NOTE: The use of an unbalanced Microphone (two
leads) is not recommended. For best results in a PA Application
always use a Unidirectional, Low Impedance, Balanced
Microphone (three leads).

CABLE LENGTH - If the distance between the Microphone and
the Amplifier Input is greater than 15 ft (4.5 m) a Balanced
Microphone must be used. Use a two conductor shielded wire and
connect Microphone to Amplifier as per Diagram in Fig. 5A.

MICROPHONE CABLE ROUTING - The Microphone Cable
should be carefully routed. Improper Cable routing will cause spu­rious oscillations, regenerative noises, hum, etc. that may perma­nently damage the Amplifier.

 Do not route cable next to power lines.


Do not route cable near or over Fluorescent Fixtures.



Do not route cable next to Speaker Wires.



Do not install cable inside Power Line Conduits.



Avoid the use of staples that may penetrate the cable.

UNBALANCED MICROPHONE

Attach the Microphone leads to the terminal strip as per diagram
in Fig 5B.
Be sure the cable length does not exceeds 15 Ft. (4.5 m).

®

CAUTION; TO REDUCE THE RISK OF FIRE OR SHOCK DO NOT
EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. DO NOT
REMOVE COVER. THERE ARE NO USER SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

117V 60 Hz

POWER RATING
SUPPLY VOLTAGE

POWER CONSUMPTION

CAUTION: TO REDUCE THE RISK OF FIRE,
REPLACE ONLY WITH SAMETYPE OF

LINE FUSE

1.6A 250 V

FUSE.

ATTENTION: AFIN DE
REDUIR LE RISQUE
D©INCENDIE, REMPLACER
SEUL PAR UN FUSIBLE DE
MEME TYPE.

500 W MAX.

UNSWITCHED

ATTENTION: POUR REDUIRLES RISQUES D© INCENDIE OU
DE CHOC ELECTRIQUE, NE PAS EXPOSER A LA PLUIE OU
L©HUMIDITE, NE PAS ENLEVER LE COUVERCLE. AUCUN
REGLAGE A L©INTERIEUR. POUR REPARATION
CONSULTERUNE PERSONNE QUALIFIEE

T3115BGM

AMPLIFIER

15 W RMS

117V 60 HZ

570 VA

COM 70V

GROUND

CLASS 2 WIRING ACCEPTABLE

SER. NO.

8 25V

THREE LEADS BALANCED MICROPHONE WIRING

The microphone lead color refers to Paso Microphones only. When using
other microphone brand refer to instructions packed with the unit.

RED

WHITE

MIC

PROGRAM

SHIELD

MIC

AUX

47K ohm 200 Mv

IN PARALLEL

MOH OUTPUT

600 ohm

1 Volt

1 WATT

8 OHM

MUTE

L

MOH OUTPUT

LEVEL

R

10K OHM

1 V

BALANCED BALANCED BALANCED

250 OHM

1 MV

AUX

ATTENUATOR

600 OHM

100 MV

GHOTCOMGHOTCOMGHOTCOMUNMUTE G

TEL OUTPUT

LEVEL

TELMICPROGRAM

G MUTE

3115micbal

G COM HOT

BALANCED

TWO LEADS UNBALANCED MICROPHONE WIRING

The microphone lead color refers to Paso Microphones only. When
using other microphone brand refer to instructions packed with the unit.

MIC

3115micunbal

G MUTE

PROGRAM

G COM HOT

BALANCED

SHIELD

GUNMUTE

BALANCED

WHITE

GUNMUTE

BALANCED

COM HOT

RED

MIC

COM HOT

®

PAGE 6

Specifications are subject to change without notice

T3115/3130/3160BGM

INTEGRATED AMPLIFIERS

INSTALLATION AND WIRING

INPUT CONNECTIONS

MICROPHONE INPUT

USING A PUSH-TO-TALK DESK BASE MICROPHONE

Microphone paging and precedence over the AUX or PROGRAM
channels may be accomplished by using a Desk Base or a
Gooseneck Microphone. Wire the Microphone output leads to the
MIC input terminals as per Fig. 6A.
MUTING: The Amplifier is equipped with two independent Muting
Circuits:

 Direct Muting by shorting the MUTE Terminals


Automatic Muting with VOX - Voice Activated Muting

For additional information on the Muting operation refer to the
Muting Functions section of this Manual.

WIRING

CONNECTING TO THE TELEPHONE PAGING SYSTEM

Fig. 6A - Rear Panel MIC Input Terminals

Wire the Desk Base Microphone leads to the Microphone Input
terminal strip as per diagram in Fig 6A. Check Microphone instruc­tions and connect HOT LEAD (B) to Terminal HOT, COMMON
LEAD (A) to Terminal COM and SHIELD LEAD to Terminal G.

DO NOT GROUND THE MICROPHONE CABLE SHIELD TO THE
CHASSIS OF THE AMPLIFIER

Fig. 6B - Rear Panel TEL Input Terminals

PAGING FROM THE TELEPHONE SYSTEM

WIRING - The Amplifier is interface ready for the Telephone line in
applications requiring paging from the telephone system. The
Telephone line Paging Output (Tip and Ring) can be directly con­nected to the TEL input and to the HOT and COM as shown in the
wiring diagram Fig. 6B.

CABLE - Use a two conductor twisted wire.

DO NOT GROUND THE TIP OR RING WIRE TO THE CHASSIS
OF THE AMPLIFIER

OUTPUT LEVEL CONTROL - An Output Level Control is provided
on the rear panel. After wiring adjust control for the desired output
level.

VOICE ACTIVATED MUTING (VOX) - Muting of the AUX or PRO­GRAM channels (music muting) during Paging is automatic via the
Voice Activated Muting System. No contact closure for the Muting
Circuit is required from the Telephone system. For additional infor­mation on the Muting operation refer to the Muting Functions sec­tion of this Manual.

b50side

Push to Talk Key

Fig. 6C - Desk Base Microphone

PROFESSIONAL AUDIO & SOUND

DESK BASE/GOOSENECK MICROPHONE WITH MUTING SWITCH

MICROPHONE OUTPUT LEVEL CONTROL IS LOCATED ON THE FRONT PANEL

MIC

MUTING SWITCH

micbas03

SHIELD

A

PROGRAM MIC TEL

MIC

B

GGG COM HOTHOT HOTCOM COMG MUTEUNMUTE

Push to Talk Key

b50side

OUTPUT LEVEL

PROFESSIONAL AUDIO & SOUND

TELEPHONE PAGING LEVEL CONTROL

PEAK

POWER

O

INPUT 1 INPUT 2 INPUT 3 INPUT 4/AUX 1 INPUT 5/AUX 2 BASS TREBLEMODULE

teleinp03

TM

DMS

DIGITAL MUSIC AMPLIFIER

DIGITAL MUSIC SERIES

100 100 100 100 100 100 +10-10 +10-10

DMS Amplifier

TELEPHONE PAGING INPUT

Telephone

System KSU

TIP

RING

PROGRAM MIC TEL

TEL

TEL

RT

GGG COM HOTHOT HOTCOM COMG MUTEUNMUTE

BALANCEDBALANCEDBALANCED

KSU

TEL OUTPUT

LEVEL

Telephone

PAGE 7

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICET3115/3130/3160BGM

INSTALLATION AND WIRING

®

INTEGRATED AMPLIFIERS

INPUT CONNECTIONS

MICROPHONE INPUT PHANTOM POWER

CONDENSER AND ELECTRET TYPE MICROPHONES

Condenser and Electret Microphones require a DC Operating
Voltage. Paso Amplifiers provide this operating voltage or Phantom
Power selectively on the Microphone Input.

Prior to selecting the Condenser or Electret Microphone be sure
that the Operating Voltage and Output Impedance of the device
match the Input characteristics of the Amplifier listed below.

Phantom Power = 16 Volt DC
Input Impedance = 250 to 600 ohm

ACCESS TO PHANTOM POWER SELECTOR

1) Remove Power Cord from AC Outlet.

2) Remove the three screws on each side of the Amplifier and
the three screws located on the Rear Panel Top securing the
Top Cover to the Chassis.

3) Lift Cover and carefully slide Cover out towards the rear.

4) Locate the Preamplifier Printed Board No. 3130-2 attached
to the rear panel and behind the Inputs Terminal Strip.

PHANTOM POWER SELECTOR

Fig. 7 - Rear Panel MIC Input Terminals

Fig. 7A - Preamplifier PCB Top View

PHANTOM POWER SELECTOR JUMPER

By following the Preamplifier Printed Board layout as
shown on Fig. 7A locate the Selector Jumper marked
PHANTOM.

The Jumper Socket is marked as follows:

JP4 = ON - OFF - PHANTOM

To turn the Phantom Power On, re-position the
Jumper to the ON POSITION (JP 4).

To change the Selector position lift the Mini Shorting
Plug out of the socket pins and re-position as desired.
Make sure the Mini Plug is lined up with the socket
pins.

THE FOLLOWING INSTRUCTIONS REQUIRE THE REMOVAL OF THE AMPLIFIER PROTECTIVE COVER AND ARE
PROVIDED FOR USE BY QUALIFIED PERSONNEL ONLY.

TO AVOID THE RISK OF ELECTRICAL SHOCK DO NOT PERFORM ANY INSTALLATION OR SERVICING UNLESS YOU
ARE QUALIFIED TO DO SO. REFER INSTALLATION OR SERVICING TO QUALIFIED PERSONNEL.

CAUTION ! REMOVAL OF THE AMPLIFIER COVER PRESENTS AN ELECTRICAL SHOCK HAZARD

ALWAYS REMOVE THE POWER CORD FROM THE AC WALL OUTLET

CONDENSER AND ELECTRET MICROPHONES WIRING

CONDENSER/ELECTRET MICROPHONE

Carefully follow the wiring instruction packed with the Microphone
used. Attach the microphone leads to the terminal strip as per dia­gram in Fig 7.

DO NOT GROUND THE MICROPHONE CABLE SHIELD TO THE
CHASSIS OF THE AMPLIFIER

PROFESSIONAL AUDIO & SOUND

AMPLIFIER REAR PANEL

BALANCED CONDENSER/ELECTRET MICROPHONE WIRING

The diagram indicates the Phantom Power Voltage and Polarity available at
the Input Terminals when the Phantom Power is activated

3115micbal05

MICROPHONE

CONDENSER

ELECTRET

G MUTE

G COM HOT

BALANCED

PROGRAM

SHIELD

0

GUNMUTE

BALANCED

MIC

+16V

+16V

COM HOT

®

PAGE 8

Specifications are subject to change without notice

T3115/3130/3160BGM

INTEGRATED AMPLIFIERS

INSTALLATION AND WIRING

MUTING FUNCTIONS

VOX - VOICE ACTIVATED MUTING - The Amplifier is equipped
with a noiseless, fast acting Logic Muting Function. When a signal
is present at the MICROPHONE or TELEPHONE Input, either
from a Microphone or a Telephone Paging source, the Muting
Function is activated muting the source present at the AUX Input
and as well as the source present at the PROGRAM input if selec­tively activated. Once the Signal (paging) is terminated the pro­gram is automatically restored on all muted inputs.

FOR THE VOX ATTACK AND DECAY TIMING REFER TO THE
FIG. 9B DIAGRAM.

ACCESS TO MUTING SELECTORS

FOLLOW DIRECTIONS AS PER DIRECT MUTING FUNCTION.

Fig.8 - Main Amplifier PCB - VOX - MUTING Section - Top View

VOX - VOICE ACTIVATED MUTING

VOX SENSITIVITY CONTROL

The VOX Sensitivity Intervention threshold is adjusted at the factory for best performance and does not require re-touch­ing under normal circumstances. Should the Trimmer pre-setting require adjustment follow the instructions listed below.

The Amplifier provides several levels of Muting functions:

MICROPHONE Can be selectively Muted by internal selector
TELEPHONE This input is never Muted
AUXILIARY Can be selectively Muted by internal selector
PROGRAM Can be selectively Muted by internal selector

MUTING FUNCTIONS

CAUTION: PRIOR TO PERFORMING THIS
OPERATION BE SURE TO FOLLOW THE
SAFETY NOTES REFERRING TO THE
REMOVAL OF THE AMPLIFIER COVER.

AUTOMATIC PRECEDENCE THRESHOLD

The VOX Trimmer VR 9 sets the sensitivity level at which
point the VOX is engaged during paging. The VOX
Trimmer VR9 is located on the Main Printed Circuit
Board (see Fig.89).

CAUTION: Procure a miniature screwdriver having a tip
NO WIDER than 3/16” (3 mm). A larger tip screwdriver
can damage the trimmer.

1) Turn all Input Controls to 0.

2) Turn Trimmer counterclockwise until it stops.

3) Connect a Paging Source (Microphone or Telephone)
to the respective Input Terminals (For connection details
refer to the appropriate section in this Manual).

4) While talking from the Paging Source (Microphone or
Telephone) rotate the MIC (Front Panel) or TEL (Rear
panel) Volume Control until the desired output level is
achieved.

5) Connect a Music Source to the AUX 1 Input and
rotate the AUX 1/CD Volume Control on the front panel
until the desired output level is achieved.

6) While talking from the Paging Source (Microphone or
Telephone) turn the Trimmer slowly clockwise until the
Program (music) is cut-off (Muting activated).

VOX SENSITIVITY ADJUSTMENT

VOX DEFEAT INSTRUCTIONS

In applications requiring the VOX to be
inoperative rotate the VOX TRIMMER VR 9
fully counterclockwise. In this position the
VOX is inoperative.

MUTING JUMPERS ADDRESS

Several Jumpers are provided to set the Muting functions:

JUMPER NO. FUNCTION

JP 1 MICROPHONE Mute ON - OFF
JP 2 AUXILIARY Mute ON - OFF
JP 3 PROGRAM Mute ON - OFF

NOTE:

The Microphone Input is provided with a unique MUTE

and UNMUTE function. See the Mute/Unmute operation instruc-

tions in the appropriate section in this Manual.

PROFESSIONAL AUDIO & SOUND

VOX SENSITIVITY TRIMMER

3130 - 1

VOX

VR9
VOX

JP1

SELECTOR JUMPERS

MIC

VOLUME

OFF

ON

ON

JP2

OFF

JP3

ON

OFF

AUX

VOLUME

PROGRAM

VOLUME