ART+SOUND PR-4120 User manual

Operating Manual
PR-4120
PR-4240
POWER AMPLIFIER
Please follow the instructions in this manual to obtain the optimum
results from this unit.
We also recommend that you keep this manual handy for future reference
Check our website for any updates of this manual: www.artsound.be
House of Music NV
Kruishoutem, Belgium
www.artsound.be
Tel. [phone]
Fax. [phone]
[email protected]

PR-4120 / PR-4240
2
Table of contents
1. Safety precautions 3
2. General description 5
3. Features 5
4. Nomenclature and functions 5
4.1 front panel 5
4.2 rear panel 6
5. Connections 6
5.1 speaker connections 6
5.2 input connections 6
6. Applications 7
7. Block diagram 8
8. Specications 9
9. Dimensionaldiagram 10

PR-4120 / PR-4240
3
1 Safety precautions.
• Besuretoreadtheinstructionsinthissectioncarefullybeforeuse.
• Makesuretoobservetheinstructionsinthismanualastheconventionsofsafetysymbolsandmessagesregarded
asveryimportantprecautionsareincluded.
• Wealsorecommendyoukeepthisinstructionmanualhandyforfuturereference.
Warnings and safety.
Safety Symbol and Message Conventions.
Safetysymbolsandmessagesdescribedbelowareusedinthismanualtopreventbodilyinjuryandpropertydamage,
whichcouldresultfrommishandling.Beforeoperatingyourproduct,readthismanualrstandunderstandthesafety
symbols and messages so you are thoroughly aware of the potential safety risk.
Warning.
When Installing the Unit.
• Donotexposetheunittorainoranenvironment
where it may be splashed by water or other liquids, as
doingsomayresultinreorelectricshock.
• Usetheunitonlywiththevoltagespeciedon
theunit.Usingavoltagehigherthanthatwhichis
speciedmayresultinreorelectricshock.
• Do not cut, kink, otherwise damage nor modify the
powersupplycord.Inaddition,avoidusingthepower
cordincloseproximitytoheaters,andneverplace
heavyobjects--includingtheunititself--onthe
powercord,asdoingsomayresultinreorelectric
shock.
• Besuretoreplacetheunit’sterminalcoverafter
connectioncompletion.Becausehighvoltageisapplied
tothespeakerterminals,nevertouchtheseterminals
toavoidelectricshock.
• Be sure to ground to the safety ground (earth)
terminaltoavoidelectricshock.Nevergroundtoagas
pipe as a catastrophic disaster may result.
• Avoidinstallingormountingtheunitinunstable
locations, such as on a rickety table or a slanted
surface. Doing so may result in the unit falling down,
causingpersonalinjuryand/orpropertydamage.
󰌥
󰌥
WARNING
Indicates a potentially hazardous situation which, if mishandled, could result in death or serious
personal injury.
CAUTION
Indicates a potentially hazardous situation which, if mishandled, could result in moderate or
minor personal injury, and/or property damage.
When the Unit is in Use.
• Should the following irregularity be found during use,
immediately switch off the power, disconnect the
power supply plug from the AC outlet and contact your
nearest ArtSound dealer. Make no further attempt to
operatetheunitinthisconditionasthismaycausere
or electric shock.
• If you detect smoke or a strange smell coming from
the unit.
• Ifwateroranymetallicobjectgetsintotheunit
• If the unit falls, or the unit case breaks
• If the power supply cord is damaged (exposure of
the core, disconnection, etc.)
• If it is malfunctioning (no tone sounds.)
• Topreventareorelectricshock,neveropennor
removetheunitcaseastherearehighvoltagecompo-
nentsinsidetheunit.Referallservicingtoyournear-
est ArtSound dealer.
• Do not place cups, bowls, or other containers of liquid
ormetallicobjectsontopoftheunit.Iftheyacciden-
tallyspillintotheunit,thismaycauseareorelectric
shock.
• Donotinsertnordropmetallicobjectsorammable
materialsintheventilationslotsoftheunit’scover,as
thismayresultinreorelectricshock.

PR-4120 / PR-4240
4
When the Unit is in Use.
Caution.
When Installing the Unit.
An all-pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated in
the electrical installation of the building.
Duetoproductupgrades,whilesomeofthefeaturesandspecicationintheusermanualdoesnot
matchtheactualfunctions,sorryforanyinconvenienceandthanksforyourkindunderstanding!
• Neverpluginnorremovethepowersupplyplugwith
wet hands, as doing so may cause electric shock.
• When unplugging the power supply cord, be sure to
graspthepowersupplyplug;neverpullonthecord
itself. Operating the unit with a damaged power supply
cordmaycauseareorelectricshock.
• Whenmovingtheunit,besuretoremoveitspower
supplycordfromthewalloutlet.Movingtheunitwith
the power cord connected to the outlet may cause
damagetothepowercord,resultinginreorelectric
shock.Whenremovingthepowercord,besuretohold
its plug to pull.
• Donotblocktheventilationslotsintheunit’scover.
Doing so may cause heat to build up inside the unit
andresultinre.
• Avoidinstallingtheunitinhumidordustylocations,
in locations exposed to the direct sunlight, near the
heaters, or in locations generating sooty smoke or
steamasdoingotherwisemayresultinreorelectric
shock.
• Donotplaceheavyobjectsontheunitasthismay
cause it to fall or break which may result in personal
injuryand/orpropertydamage.Inaddition,theobject
itselfmayfalloffandcauseinjuryand/ordamage.
• Makesurethatthevolumecontrolissettominimum
position before power is switched on.
• Loudnoiseproducedathighvolumewhenpoweris
switched on can impair hearing.
• Do not operate the unit for an extended period of time
with the sound distorting. This is an indication of a
malfunction, which in turn can cause heat to generate
andresultinare.
• Contact your ArtSound dealer as to the cleaning. If
dustisallowedtoaccumulateintheunitoveralong
periodoftime,areordamagetotheunitmayresult.
• If dust accumulates on the power supply plug or in the
wallACoutlet,aremayresult.Cleanitperiodically.
In addition, insert the plug in the wall outlet securely.
• Switch off the power, and unplug the power supply
plug from the AC outlet for safety purposes when
cleaningorleavingtheunitunusedfor10daysor
more.Doingotherwisemaycauseareorelectric
shock.

PR-4120 / PR-4240
5
1. POWER SWITCH
On top of the opening Power Press the end, power
shut down
2. CH1\CH2\CH3\CH4 VOLUME
Channelvolumecontrol
3. SIGNAL
Signal indicator LED When lit input signal is
detected.
4. CLIP
Clip lit when max wattage output & output signal
distortion.
5. PROT
The protection indicator will be light on when the
constant output is 160% higher than the rated out-
put,theoutputwillbecuttoprotectiontheamplier
from damage. This indicator will be extinguished
whenamplierisundernormalworkingconditions.
6. POWER
Power indicator LED
7. TEMP
The protection indicator will be light on when the
insidetemperatureisover90,theoutputwillbecut
toprotecttheamplierfromdamage.Itwillresume
to work after cooling down
2. General description.
4. Nomenclature and functions.
3. Features
Withfourseparatepowerampliersinasinglechassis
and power ratings from 120 to 240 watts RMS, these
sleek,attractiveunitsprovideacompactsolutionforPA
systemamplicationanddistribution.
Each channel has its own input and 4 ohm,70 V and
100Vspeakeroutputs,soawidevarietyofaudiosources
andspeakerzonescanbeeasilycongured.
• Ratedoutputs:120Wand240W.
• 100V/70Vlinetransformer-isolatedspeakeroutputs,
low impedance 4 ohms speaker outputs.
• Fourindependentampsinasinglechassis.
• Fourlinelevelinputs.
• Commercial-gradetoroidaltransformersproducehigh
performance audio on a wide range of frequencies.
• Intelligentlimitercanreduceexcesssignal.
• Reliableprotectionagainstoverload,shortcircuit,
andpoweructuationforoptimumreliability.
• Heatsinksandfanprotectagainstoverheating,
protectingtheampliersworkinglife.
• Rubberfeetandrackmountears-maybeplacedon
tables or installed in rack mount cabinets.
4.1 Front panel.
POWER
TEMP
ON
OFF
5
0
1
2
3
4 6
7
8
9
10
CH 1
5
0
1
2
3
4 6
7
8
9
10
CH 2
5
0
1
2
3
4 6
7
8
9
10
CH 3
5
0
1
2
3
4 6
7
8
9
10
CH 4
PROTECT
SIGNAL
CLIP
12
5 4 3
6
7

PR-4120 / PR-4240
6
8. ~230V 50Hz POWER INPUT
9. COMMON SPEAKER OUTPUT (CHANNEL
1/2/3/4)
Connectors for 4 ohms or 70V and 100 V speaker
10. AUDIOINPUT
(CH1IN/CH2IN/CH3IN/CH4IN)
11. FAN
Equipment,exhaustvents,equipmentworkproperly,
youmustwraptheholecannothaveanyobject
covered,toavoidoverheatingprotection
Notes
• Boththe4Ωxand70V/100Vterminalscannotbeusedatthesametime.
• Impedancesindicatedintheguresrepresentthetotalspeakersystem(load)impedances
5. Connections.
5.1 Speaker connections.
4.2 Rear panel.
USE ONLY WITHA 250VFUSE
12
3
12
3
12
3
12
3
CH 1 OUT CH 2 OUT
CH 3 OUT CH 4 OUT
CH 1 IN CH 2 IN
CH 3 IN CH 4 IN
1
2
3
XLR BAL
INPUT
1-GND
2-HOT+
3-COLD-
70V COM 100V 4
70V COM 100V 4
70V COM 100V
4
70V COM 100V 4
Power Consumption
400 Watt
8 9 10 11
100V LINE
70V 100V
(PR-4120)
41
70V LINE4
COM 4
(PR-4120)
83
70V 100V
COM 4 70V 100V COM 4
(PR-4240)
20 (PR-4240) 42
󰌥WARNING
Be sure to attach the supplied terminal cover after connection completion. Because high voltage
is applied to the speaker terminals, never touch these terminals to avoid electric shock.
5.2 XLR connections
CombinedXLR(female)/phonejackconnectors

PR-4120 / PR-4240
7
US
E O
NLYW
ITH
A 250V FUS
E
12
3
12
3
12
3
12
3
CH 1 OUT CH 2 OUT
CH 3 OUT CH 4 OUT
CH 1 IN CH 2 IN
CH 3 IN CH 4 IN
1
2
3
XLR BAL INPUT 1-GND 2-HOT+ 3-COLD-
70V
COM
100V
4
70V
COM
100V
4
70V
COM
100V
4
70V
COM
100V
4
Power Consumption 400 Wa tt
Speaker
Speaker
AUDIO OUT
RR
LL
CD Player
CH 1CH 2CH 3CH 4CH 5CH 6CH 7CH 8EMC I NPUT
OUT PUTOUT PUTOUT PUTOUT PUTOUT PUTOUT PUTOUT PUTOUT PUT2 INPUTINP UTINPUTINP UTINPUTINP UTINPUTINP UT1
AUDIO OUT
RR
LL
CD Player
AUDIO OUT
RR
LL
CD Player
AUDIO OUT
RR
LL
CD Player
CH1 IN
Ch2 IN Ch3 IN Ch4 IN
Multi-channel Mixer Pre-amplifier
4-Channel power Amplifier
6. Applications.
Rear panel connections.

PR-4120 / PR-4240
8
EB
PA
CH2 LINK
CH2 INPUTS
TO
EB
PA 100V
70V
4
COM
CH1 LINK
CH1 INPUTS TO
POWER
Z ~220-240V 50/60Hz
PT
EB
PA
CH1 LINK
CH1 INPUTS TO
EB
PA
CH2 LINK
CH2 INPUTS
TO
100V
70V
4
COM
100V
70V
4
COM
100V
70V
4
COM
7. Block diagram.

PR-4120 / PR-4240
9
8.Specications.
Model PR-4120 PR-4240
Rated power output 4 x 120 W 4 x 240 W
Speaker outputs 4Ω,70V/100V
Outputs noise < 3 mV
Impedance 200:1
Inputsensitivity 775mV/0dB
Frequency response 50 Hz ~ 16 KHz distortion < 1.5 Db
S/N ratio >15V/microsecond
T.H.D < 1 %
Cool method Compulsivewindcoolform
Indicators Power, Signal, Protection,Peaking
Protection Poweron,OverloadandProtection
Power requirements ~220-240V50/60Hz(Specicvoltageandfrequencyvalues
tothemachinetoprevailinkind.)
Power consumption 720 W 1500 W
Dimension (mm) 484 x 353 x 88
Weight 26 kg 29 kg
Gross weight 27 kg 30 kg

PR-4120 / PR-4240
10
100
Over
100
Over
Over
100
6
84
84
25
459
453
84
90
436
484
PO WER
TEMP
ON
OF F
5
0
1
2
3
4 6
7
8
9
10
CH 1
5
0
1
2
3
4 6
7
8
9
10
CH 2
5
0
1
2
3
4 6
7
8
9
10
CH 3
5
0
1
2
3
4 6
7
8
9
10
CH 4
PROTECT
SIG NA L
CLIP
USEONLY WITHA250V FUSE
12
3
12
3
12
3
12
3
C H 1 OUT CH 2 OUT
C H 3 OUT CH 4 OUT
CH 1 IN CH 2 IN
CH 3 IN CH 4 IN
1
2
3
XLR BAL
INPUT
1-GND
2-HOT+
3-COLD-
70V COM 100V 4 70V COM 100V
4
70V COM 100V 4
70V COM 100V 4
Power Consumption
400 Watt
PO WER
TEMP
ON
OFF
5
0
1
2
3
4 6
7
8
9
10
CH 1
5
0
1
2
3
4 6
7
8
9
10
CH 2
5
0
1
2
3
4 6
7
8
9
10
CH 3
5
0
1
2
3
4 6
7
8
9
10
CH 4
PROTECT
SIGNAL
CLIP
9.Dimensionaldiagram.
Keeptheunit’sallsidesover10cmawayfromobjectsthatmayobstructairowtopreventtheunit’s
internal temperature rise.
UNIT : mm
UNIT : mm

DiscoverthecompleteArtSound
range at www.artsound.be
TM
Art_Sound
House Of Music NV
Kruishoutem, Belgium
www.artsound.be
Tel. [phone]
Fax. [phone]
[email protected]