Quest Engineering PR Series User manual

Owner’s Manual
PR-120 / PR-240
+12dB
0dB
-12dB
+12dB
0dB
-12dB
125Hz250Hz 500Hz
GRAPHIC EQUALIZER
1kHz 8kHz
PROTECT
+3
0
-4
-10
-20
ON
OFF
MIN MAX
2kHz 4kHz
PUBLIC ADDRESS AMPLIFIER
CHANNEL 1
MIN MAX
CHANNEL 2
MIN MAX
CHANNEL 3
MIN MAX
CHANNEL 4
MIN MAX
CHANNEL 5
MIN MAX
CHANNEL 6 CHIME
MIN MAX
POWER
ALL ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
PR-240

IMPORTANT SAFETY INSTRUCTIONS

1
PR-120 / PR-240
Introductions ...................................................................................... 2
Features .............................................................................................. 3
Front Panel Controls ........................................................................... 4
Rear Panel Contuols .......................................................................... 5
Setup .................................................................................................. 6
Wiring Guide ..................................................................................... 7
Connections ...................................................................................... 9
Operations ........................................................................................12
Applications .................................................................................... 15
Block diagram ............................................................................... 16
Specifications ................................................................................. 17
Table of Contents
Table of Contents

2
PR-120 / PR-240
Introduction
Welcome
Congratulation and thank you for the purchasing PR series, a multi-function commercial ampli-
er. These ampliers are designed to provide a big impact in sound reproduction and to produce
the best and highest quality audio at an affordable price. We wish you great enjoyment and sat-
isfaction when using your amplier, whether you are an installation, or reinforcement engineer.
Unpacking and Installation
Although it is neither complicated to install nor difcult to operate your amplier, a few minutes of
your time is required to read this manual for a properly wired installation and becoming familiar
with its features and how to use them. Please take a great care may be needed when moving
your set and are required if it ever becomes necessary to return your set for service. Never place
the unit near radiator, in front of heating vents, to direct sun light, in excessive humid or dusty
location to avoid damages and to guaranty a long reliable use.
Connect your unit with the system components according to the description on the following
pages.
+12dB
0dB
-12dB
+12dB
0dB
-12dB
125Hz250Hz 500Hz
GRAPHIC EQUALIZER
1kHz 8kHz
PROTECT
+3
0
-4
-10
-20
ON
OFF
MIN MAX
2kHz 4kHz
PUBLIC ADDRESS AMPLIFIER
CHANNEL 1
MIN MAX
CHANNEL 2
MIN MAX
CHANNEL 3
MIN MAX
CHANNEL 4
MIN MAX
CHANNEL 5
MIN MAX
CHANNEL 6 CHIME
MIN MAX
POWER
ALL ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
PR-240
PR-120 / PR-240
introductions

3
PR-120 / PR-240
Features
The PR-120 and PR-240 are comprehensive, all-in-one mixer-amplier solutions for commer-
cial and industrial applications.These low-cost units provide all necessary features in a simple
building-block format.
* Six microphone or line inputs with 1/4-inch phone,XLR and RCA jacks.
* Acceptable wide range input level.
* One remote microphone input with EURO block terminal.
* M.O.H(Music On Hold) input and output.
* One telephone paging input with EURO block terminal.
* Phantom power for MIC channel 1 and 2.
* Three layer priority muting.
* Built in four kinds user selectable pre-announce chime.
* 120watts(PR-120) ,240watts (PR-240) rated power output.
* High efciency Class-D Amplier Application (PR-240)
* Advanced protection system includes current limiting, over current and thermal protection.
* Desktop and 19-inches rack mountable type.
* Seven band graphic equalizer.
* Expendable by adding audio mixer and power amplier with LINK and PRE-AMP terminal.
* Low distortion and low noise level.
* Compact size and lightweight.
* ldeal commercial and industrial use.
Features

4
PR-120 / PR-240
+12dB
0dB
-12dB
+12dB
0dB
-12dB
125Hz250Hz 500Hz
GRAPHIC EQUALIZER
1kHz 8kHz
PROTECT
+3
0
-4
-10
-20
ON
OFF
MIN MAX
2kHz 4kHz
PUBLIC ADDRESS AMPLIFIER
CHANNEL 1
MIN MAX
CHANNEL 2
MIN MAX
CHANNEL 3
MIN MAX
CHANNEL 4
MIN MAX
CHANNEL 5
MIN MAX
CHANNEL 6 CHIME
MIN MAX
POWER
ALL ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
PR-240
Front Panel controls
1 2 3
45 6 7 8
Controls
9
1. Bay for adding optional music source (CD player with AM/FM Tuner,or MP3 player).
2. Graphic equalizer control (125Hz/250Hz/500Hz/1kHz/2kHz/4kHz/8kHz).
3. Indicators(Protection/Output level/Power).
4. Input channel volume controls.
5. Master volume controls.
6. Pre-announce chime switch.
7. All speaker zone output selector.
8. Individual speaker zone output selector.
9. Power switch

5
PR-120 / PR-240
OUTPUT
COM Hi-Z Lo-Z
PUBLIC ADDRESS AMPLIFIER
PR-240 MIC
CHANNEL 1
ON OFF
ON OFF
PRIORITY
-6 -50
PHANTOM
GAIN
MIC
CHANNEL 2
ON OFF
ON OFF
PRIORITY
-6 -50
PHANTOM
GAIN
MIC
CHANNEL 3
-6 -50
GAIN
MIC
CHANNEL 4
-6 -50
GAIN
MIC
CHANNEL 5
GAIN
CHANNEL 6
-6/+14-50/-30
GAIN
-6/+14-50/-30
GAIN
LINE/
EXT. MOH LINE
REMOTE MIC
MIN
GCH
GCH GCSWH
LINK
OUT
PRE-AMP
OUT
LINK
IN
DESIGNED AND ENGINEERED IN KOREA
AMP
IN MAX
VOLUMEVOLUME
MINMAX
MINMAX
INT. EXT.
MUSIC ON HOLD CHIME
TELE-PAGING MIC
WARNING
DO NOT EXPOSE
THIS EQUIPMENT
TO RAIN OR
MOISTURE
CAUTION
FOR CONTINUED
PROTECTION AGAINST
RISK OF FIRE, REPLACE
ONLY SAME TYPE FUSE
AVIS
RISQUE DE CHOC
ELECTRONIQUE NE
PAS OUVRIR
ATTENTION
UTILISER UN FUSIBLE
DE RECHANGE MEME
TYPE
~ AC INPUT
120V 60Hz, 88W
FM/AM ANTENNA
FUSE T6.3AH/250V
FUSE
1 2 345 6
11 10 98
Controls
7
1. AC fuse.
2. Expansion ports ( AMP-IN/AMP-OUT/LINK-IN/LINK-OUT ).
3. M.O.H (Music On Hold) output and level control.
4. Pre-announce chime level control.
5. Gain controls for variable input level.
6. Phantom power and priority control switches.
7. Signal input connectors.
8. Remote microphone station input connector and output level control
9. Telephone paging input connector.
10. Speaker outputs connector ( 4-ohm, selectable 25V, 70V and 100V ).
11. AC power cable.
Rear Panel controls

6
PR-120 / PR-240
Installation:
CAUTION: Before you begin, make sure your mixer-amplier is disconnected from the power
source, with the power switch in the “OFF” position and all level controls turned completely down
(counterclockwise)
You may stack mixer-ampliers without using a cabinet or you may place a single mixer-amplier
on a surface with 12-inches (about 30cm) of air space around the unit for convection cooling.
When using an equipment rack, do not mount units directly on top of each other. Allow 2U be-
tween units for convection cooling. The side walls of the rack should be a minimum of 2-inches
(about 5cm) away from the amplier sides, and the back of the rack should be a minimum of
4-inches (about 10cm) from the mixer-amplier rear panel.
How to attach rack ears
1. Locate the two rack ears and six rack-ear screws supplied.
2. Place a rack-ear ush with the right front of the chassis.
3. Insert a screw into the bottom hole of the rack-ear and chassis. Screw it in.
4. Insert a screw into the rnid hole of the rack-ear and chassis. Screw it in
5. Insert a screw into the top hole of the rack-ear and chassis. Screw it in.
6. Repeat steps 2 to 5 for the left side of the chassis.
7. Remove the four legs from bottom of unit.
8. Please refer to Figure .
Setups
Setup
+12dB
0dB
-12dB
+12dB
0dB
-12dB
125Hz
250Hz 500Hz
G
R
A
P
H
I
C
E
Q
U
A
L
I
Z
ER
1kHz 8kHz
PROTECT
+3
0
-4
-10
-20
2kHz 4kHz POWER
ON
OFF
ZONE 1
ZONE 2
ZONE 3
ZONE 4
ZONE 5
Supplied
Screws
Supplied
Screws
Supplied
Screws
[ How to connect rack ears ]

7
PR-120 / PR-240
Wiring guide
Jam industry recommends using pre-built or professionally wired balanced line,22 to 24 gauge
cables.Figure shows connector pin assignments for wiring .The RCA input connections can also
be used for unbalanced inputs.
Setups
-
+
SHIELD SOURCE
BALANCED LINE
MIXER-AMP INPUT
MIXER-AMP INPUT
Unbalances 1/4” Connector Balances TRS 1/4” Connector
OUTPUT
OUTPUT
-
+
s
-
+
SHIELD TO DESTINATION
BALANCED LINE
-
+
s
+
SHIELD SOURCE
straln rellef clamp sleeve
ground/shleld
tip
signal
sleeve
tip
UNBALANCED LINE
XLR Balanced Wiring Guide
Input output
-
+
s
+
SHIELD
TO DESTINATION
UNGROUNDED
PROOUCT WITH
2-PRONG POWER
CORO ONLY
1=ground/shield
2=hot(+ve)
3=cold(-ve)
( This connection reduces
the signal level by 6 dB )
For connection of balanced and unbalanced plugs,
ring and sleeve have to be bridged at the stereo plug
UNBALANCED LINE
-
+
s
straln rellef clamp sleeve
ground/shleld
tip
hot
ring
cold
sleeve
tip
rlng
21
3
12
3
Choose input wire and connectors
For unbalanced use pin 1 and 3 have to be bridged

8
PR-120 / PR-240
For the amplier output connectors,Jam industry recommends using pre-built or professionally
wired, high-quality, and heavy gauge speaker wires.You may use EURO blocks for your output
connectors.To prevent the possibility of short-circuits, wrap or otherwise insulate exposed loud-
speaker cable connectors.
Using the guidelines below, select the appropriate size wire based on the distance from amplier
to speaker. The wire sizes apply to the 4-ohm tap.
Distance Wire Size
Up to 25 ft. 16 AWG
26~40 ft. 14 AWG
41~60 ft. 12 AWG
61~100 ft. 10 AWG
101~150 ft. 8 AWG
151~200 ft. 6 AWG
NOTE: Custom wiring shoule only be performed by qualied personnel. Class 2 wiring is re-
quired.
CAUTION: Never use shielded cable for output power wiring
Figure shows connector pin assignments for wiring
Setups
Choose output wire and connectors
-
-
+
ZONE 5
ZONE 4
ZONE 3
ZONE 2
ZONE 1
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
4 ohm
Loud speaker
Low-Z Speaker Output
-
+
High-Z Speaker Output
[ Pin assignments for speaker connecting ]

9
PR-120 / PR-240
Connections
Setups
INPUT: Connect microphones or balanced line-level sources to mixer-amplier balanced inputs.
Set Gain volume accordingly. Connect unbalanced line-level signals to RCA input connectors.
OUTPUT: Maintain proper polarity on output connectors.
For each output channel, connect the output EURO block terminals to the loudspeaker Ioads.
Use terminals marked (GND) and for a 4-ohm loudspeaker load, or use terminals marked
to and COM for constand-voltage loudspeaker loads.
Connect the COM terminal to speaker negative(-) lead; connect one of the other terminals to
speaker positive (+) lead.
The impedance and output voltage are same as following Table.
PR-120 4Ω / 22V 5.2Ω / 25V 42Ω / 70V 83Ω / 100V
PR-240 4Ω / 31V 2.6Ω / 25V 21Ω / 70V 42Ω / 100V
[ output voltage and impedance]
NOTE : Impedances indicated in the table represent the total speaker system impedances.
Figure shows the way how to select impedance.
1
5
4Ω
BLU
GRN
RED
25V
70V
100V
T10
BLK
BLK
BLK
T13
[ How to change high impedance output voltage ]
The wires of output transformer are connected to terminal on output select pcb same as follow
table.
T10 T11 T12 T13
100V RED wire BLUE wire GREEN wire BLACK wire
70V GREEN wire RED wire BLUE wire BLACK wire
25V BLUE wire GREEN wire RED wire BLACK wire
NOTE:These connectors are set in 100V output except US, CANADA ( 70V output )

10
PR-120 / PR-240
CAUTION : Never use both the Low-Z(4 ohms)and Hi-Z(25V, 70V and 100V) terminals at the
same time
OUTPUT
COM Hi-Z Lo-Z
PUBLIC ADDRESS AMPLIFIER
PR-240
MIC
CHANNEL 1
ON OFF
ON OFF
PRIORITY
-6 -50
PHANTOM
GAIN
MIC
CHANNEL 2
ON OFF
ON OFF
PRIORITY
-6 -50
PHANTOM
GAIN
MIC
CHANNEL 3
-6 -50
GAIN
MIC
CHANNEL 4
-6 -50
GAIN
MIC
CHANNEL 5
GAIN
CHANNEL 6
-6/+14-50/-30
GAIN
-6/+14-50/-30
GAIN
LINE/
EXT. MOH LINE
REMOTE MIC
MIN
GCH
GCH GCSWH
LINK
OUT
PRE-AMP
OUT
LINK
IN
DESIGNED AND ENGINEERED IN KOREA
AMP
IN
MAX
VOLUMEVOLUME
MINMAX
MINMAX
INT. EXT.
MUSIC ON HOLD CHIME
TELE-PAGING
MIC
WARNING
DO NOT EXPOSE
THIS EQUIPMENT
TO RAIN OR
MOISTURE
CAUTION
FOR CONTINUED
PROTECTION AGAINST
RISK OF FIRE, REPLACE
ONLY SAME TYPE FUSE
AVIS
RISQUE DE CHOC
ELECTRONIQUE NE
PAS OUVRIR
ATTENTION
UTILISER UN FUSIBLE
DE RECHANGE MEME
TYPE
~ AC INPUT
120V 60Hz, 88W
FM/AM ANTENNA
FUSE T6.3AH/250V
FUSE
[ Wrong connection ]
Setups
Speaker connection is shown in Figure.
OUTPUT
COM Hi-Z Lo-Z
OUTPUT
COM Hi-Z Lo-Z
-
+
+
-
+
-
+
-
-
+
Matching
transformer
8Ω 8Ω
4Ω
-
+
-
+
-
+
[ How to connect speakers ]

11
PR-120 / PR-240 Setups
Typical input and output wiring is shown in Figure.
OUTPUT
COM Hi-Z Lo-Z
PUBLIC ADDRESS AMPLIFIER
PR-240 MIC
CHANNEL 1
ON OFF
ON OFF
PRIORITY
-6 -50
PHANTOM
GAIN
MIC
CHANNEL 2
ON OFF
ON OFF
PRIORITY
-6 -50
PHANTOM
GAIN
MIC
CHANNEL 3
-6 -50
GAIN
MIC
CHANNEL 4
-6 -50
GAIN
MIC
CHANNEL 5
GAIN
CHANNEL 6
-6/+14-50/-30
GAIN
-6/+14-50/-30
GAIN
LINE/
EXT. MOH LINE
REMOTE MIC
MIN
GCH
GCHGCSWH
LINK
OUT
PRE-AMP
OUT
LINK
IN
DESIGNED AND ENGINEERED IN KOREA
AMP
IN MAX
VOLUMEVOLUME
MINMAX
MINMAX
INT. EXT.
MUSIC ON HOLD CHIME
TELE-PAGING MIC
WARNING
DO NOT EXPOSE
THIS EQUIPMENT
TO RAIN OR
MOISTURE
CAUTION
FOR CONTINUED
PROTECTION AGAINST
RISK OF FIRE, REPLACE
ONLY SAME TYPE FUSE
AVIS
RISQUE DE CHOC
ELECTRONIQUE NE
PAS OUVRIR
ATTENTION
UTILISER UN FUSIBLE
DE RECHANGE MEME
TYPE
~ AC INPUT
120V 60Hz, 88W
FM/AM ANTENNA
FUSE T6.3AH/250V
FUSE

12
PR-120 / PR-240 Operations
Operations
External equipments connection
By connecting a signal processor such as an equalizer or limiter between the mixer section (PR
E-AMP OUT) and the power amplier section(AMP IN) of the PR series, signals can be tailored
for desired sound output.
NOTE
Inserting a 1/4-inch phone plug into AMP IN terminal disconnects internal power amplier section
from the mixer section.
Expansion PR series
PR series mixer-amplier allows expansion with LINK IN and LINK OUT connector.
If you need more input and output, just this function allows you can do that.
This function affect which signals are heard when another mixer or PR series mixer-amplier are
wired to the mixer-amplier.
Sound Processor
Master Slave
[ Expansion PR series ]
[ External equipments connection ]

13
PR-120 / PR-240 Operations
PR series mixer-amplier supply user selectable 4 kinds of preannounce chime.
The way of set up is same as follow gure .
Preannounce chime
Figure shows default set in factory. You can move the position of jumper on the T3 of main PCB
for changing pre-announce chime.
Priority
This function allows talk over for MIC channel 1 and 2.
All other input signals are muted when this function is activated
during stay “ON” position.
Figure shows the priority switches and its “ON” and “OFF” posi-
tions.
Phantom power
PR series mixer-amplier supply DC + 15 Volts phantom power
to use condenser microphone with MIC 1 and 2 channels.
Figure shows the phantom power switches and its “ON” and
“OFF” positions.
[ Chime selection ]
[ Phantom and Priority ]

14
PR-120 / PR-240
Music On Hold
Connect mixer-amplier MUSIC ON HOLD connector to music-on-hold input on telephone inter-
face/PBX like telephone pager. Set MUSIC ON HOLD volume to proper level.
PR series mixer-amplier supply two way of MUSIC ON HOLD function.
When MUSIC ON HOLD slide switch is “INT” position, MUSIC ON HOLD output is routed from
option CDP or MP3 module internally.
When the slide switch is “EXT” position, MUSIC ON HOLD output is routed from LINE IN chan-
nel ( only channel 6 ) connected external music source.
Signal input gain control
PR series mixer-amplier can accept variable and wide range input signal with trim pot.
Adjusts the trim pot in a range of 44dB to accept variabe external equipments.
Figure 3.6 shows detail input sensitivities.
Priority Control
PR series mixer-amplier has three layer priority mute function. When higher level source is
activated, other input signals are muted except same priority level source.
CH3~CH6>CH1~CH2, Remote MIC, Chime>Telephone paging.
Operations
Telephone pager/PBX
[ Music on hold ]
[ Acceptable input sensitivity per each channels ]

15
PR-120 / PR-240 Applications
Applications
!
OUTPUT
COM Hi-Z Lo-Z
FUSE1A/250V
PUBLIC ADDRESS AMPLIFIER
MIC
CHANNEL 1
ON OFF
ON OFF
PRIORITY
-6 -50
PHANTOM
GAIN
MIC
CHANNEL 2
ON OFF
ON OFF
PRIORITY
-6 -50
PHANTOM
GAIN
MIC
CHANNEL 3
-6 -50
GAIN
MIC
CHANNEL 4
-6 -50
GAIN
MIC
CHANNEL 5
GAIN
CHANNEL 6
-6/+14 -50/-30
GAIN
-6/+14 -50/-30
GAIN
LINE/
EXT. MOH LINE
REMOTE MIC
MIN
GCH
GCH GC SWH
LINK
OUT
FM
PRE-AMP
OUT
LINK
IN
DESIGNEDAND ENGINEERED IN KOREA
AMP
IN MAX
VOLUMEVOLUME
MIN MAX
MIN MAX
INT. EXT.
MUSIC ON HOLD
75 300 CHIME
TELE-PAGING MIC
WARNING
DONOT EXPOSE
THISEQUIPMENT
TORAIN OR
MOISTURE
CAUTION
FORCONTINUED
PROTECTIONAGAINST
RISKOF FIRE, REPLACE
ONLYSAME TYPE FUSE
AVIS
RISQUEDE CHOC
ELECTRONIQUENE
PAS OUVRIR
ATTENTION
UTILISERUN FUSIBLE
DERECHANGE MEME
TYPE
~AC INPUT
230V50/60Hz,
OUTPUT
COM Hi-Z Lo-Z
FUSE2A/250V
PUBLIC ADDRESS AMPLIFIER
MIC
CHANNEL 1
ON OFF
ON OFF
PRIORITY
-6 -50
PHANTOM
GAIN
MIC
CHANNEL 2
ON OFF
ON OFF
PRIORITY
-6 -50
PHANTOM
GAIN
MIC
CHANNEL 3
-6 -50
GAIN
MIC
CHANNEL 4
-6 -50
GAIN
MIC
CHANNEL 5
GAIN
CHANNEL 6
-6/+14 -50/-30
GAIN
-6/+14 -50/-30
GAIN
LINE/
EXT. MOH LINE
REMOTE MIC
MIN
GCH
GCH GC SWH
LINK
OUT
PRE-AMP
OUT
LINK
IN
DESIGNEDAND ENGINEERED IN KOREA
AMP
IN MAX
VOLUMEVOLUME
MIN MAX
MIN MAX
INT. EXT.
MUSIC ON HOLD CHIME
TELE-PAGING MIC
WARNING
DONOT EXPOSE
THISEQUIPMENT
TORAIN OR
MOISTURE
CAUTION
FORCONTINUED
PROTECTIONAGAINST
RISKOF FIRE, REPLACE
ONLYSAME TYPE FUSE
AVIS
RISQUEDE CHOC
ELECTRONIQUENE
PAS OUVRIR
ATTENTION
UTILISERUN FUSIBLE
DERECHANGE MEME
TYPE
~AC INPUT
230V50/60Hz,
FM75 300
4F
LADIES CLOTHING
3F
MAN CLOTHING
2F
SPORTS GOODS
1F
MISCELLANEOUS
GOODS
B1F
GROCERY
B2F
PARKING LOT
1F
INFORMATION DESK
TELE-PAGER
E-MART
MUSIC
ON HOLD
OFFICE
TELEPHONE
MUSIC SOURCE
B1F PARKING
CONTROL ROOM
5F
RESTAURANT
6F
OFFICE

16
PR-120 / PR-240 Block diagrams
Block diagrams
PR-120/240 BLOCK DIAGRAM

17
PR-120 / PR-240 Specifications
Specifications
PR-120 PR-240
Input Sensitivity for full
output at maximum gain
Balanced Microphone Channels -50dB ± 3dB
Balanced Line Channels -22dB ± 3dB
Balanced Remote Microphone Station -50dB ± 3dB
Balanced Telephone Paging -21dB ± 3dB
Unbalanced Link-In -17dB ± 3dB
Unbalanced Amp-In 0dB ± 3dB
Frequency Response at 1 watt from speaker out tap.100Hz~10kHz +1.5dB / -3dB
Graphic Equalizer
125Hz,250Hz,500Hz,1kHz,2kHz,4kHz,8kHz ±12dB ±3dB
Signal to Noise Ratio at rated power output Better than 90dB
Crosstalk at all control maximum -70dB at 1kHz
Rated Output Power at THD 0.5% 120Watts 240Watts
Total Harmonic Distortion(THD) at 1kHz rated power Less than 0.5%
Phantom Power 15VDC
Power Band Width at 1kHz from speaker out tap 80Hz~15kHz with less than 0.5%
THD
DC Output Offset Less than ±3mV
Operating Temperature/Humidity at non-condensing 0°~40°C at 95% humidity
Output Voltage and
Impedance
4Ω 22V 31V
25V 5.2Ω 2.6Ω
70V 42Ω 21Ω
100V 83Ω 42Ω
Construction
Cooling Convection Cooled
Dimensions (Width/Height/Depth) 420(W) x 88(H) x 320(D) mm
Net Weight 9.76 kg 9.53 kg
Necessary modications are carried out without notice
Performance