Studiomaster DPA 5000 User manual

DUAL CHANNEL
POWER AMPLIFIERS
Owner’s Manual
DPA 2000
DPA 3200
DPA 4500
DPA 5000
R
CLIP
SIGNAL
PROTECT
POWER
Class H Professional Power Amplifier
CH 2CH 1
-6
-10
-15
-30 -1
-3
-80 0dB
-6
-10
-15
-30 -1
-3
-80 0dB
POWER
I
I
I
I
O
O
O
O
CLIP
CLIP
CLIP
SIGNAL
SIGNAL
SIGNAL
PROTECT
PROTECT
PROTECT
POWER
POWER
POWER
Class H Professional Power Amplifier
Class H Professional Power Amplifier
Class H Professional Power Amplifier
CH 2
CH 2
CH 2
CH 1
CH 1
CH 1
-6
-10
-15
-30 -1
-3
-80 0dB
-6
-10
-15
-30 -1
-3
-80 0dB
-6
-10
-15
-30 -1
-3
-80 0dB
-6
-10
-15
-30 -1
-3
-80 0dB
-6
-10
-15
-30 -1
-3
-80 0dB
-6
-10
-15
-30 -1
-3
-80 0dB
POWER
POWER
POWER

The above warning is located on the top of the unit
Explanation of Graphical Symbols
The lightning flash with arrowhead
symbol within an equilateral triangle is
intended to alert the user to the presence
of uninsulated “dangerous voltage”
within the product’s enclosure that may
be of sufficient magnitude to constitute a
risk of electric shock to persons.
The exclamation point within an
equilateral triangle is intended to alert the
user to the presence of important
operating and maintenance (servicing)
instructions in the literature accompany-
ing the product.
CAUTION: TO REDUCE THE RISK OF
ELECTRIC SHOCK, DO NOT REMOVE
COVER (OR BACK). NO USER-SERVICEABLE
PARTS INSIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
1 Read these instructions.
2 Keep these instructions.
3 Heed all warnings.
4 Follow all instructions.
5 Do not use this apparatus near water.
6 Clean only with dry cloth.
7 Do not block any ventilation openings. Install in accordance
with the manufacturer’s instructions.
8 Do not install near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including amplifiers)
that produce heat.
9 Do not defeat the safety purpose of the polarized or ground-
ing-type plug.
10 Protect the power cord from being walked on or pinched
particularly at plugs, convenience receptacles, and the point
where they exit from the apparatus.
11 Only use attachments/accessories specified by the manufac-
turer.
12 Unplug this apparatus during lightning
unused for long periods of time.
13 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.
WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO
NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.
IMPORTANT SAFETY INSTRUCTIONS
2

Precautions
— For safe operation —
WARNING
Connect this unit’s power cord only to an AC outlet of the
type stated in this Owner’s Manual or as marked on the unit.
Failure to do so is a fire and electrical shock hazard.
Do not allow water to enter this unit or allow the unit to
become wet. Fire or electrical shock may result.
Do not place a container with liquid or small metal objects on
top of this unit. Liquid or metal objects inside this unit are a
fire and electrical shock hazard.
Do not place heavy objects, including this unit, on top of the
power cord. A damaged power cord is a fire and electrical
shock hazard. In particular, be careful not to place heavy
objects on a power cord covered by a carpet.
Do not scratch, bend, twist, pull, or heat the power cord. A
damaged power cord is a fire and electrical shock hazard.
Do not remove the unit’s cover. You could receive an
electrical shock. If you think internal inspection, maintenance,
or repair is necessary, contact your dealer.
Do not modify the unit. Doing so is a fire and electrical
shock hazard.
If lightning begins to occur, turn off the power switch of
the unit as soon as possible, and unplug the power cable
plug from the electrical outlet.
If there is a possibility of lightning, do not touch the power
cable plug if it is still connected. Doing so may be an
electrical shock hazard.
If the power cord is damaged (i.e., cut or a bare wire is
exposed), ask your dealer for a replacement. Using the unit
with a damaged power cord is a fire and electrical shock
hazard.
Should this unit be dropped or the cabinet be damaged, turn
the power switch off, remove the power plug from the AC
outlet, and contact your dealer. If you continue using the
unit without heeding this instruction, fire or electrical
shock may result.
If you notice any abnormality, such as smoke, odor, or
noise, or if a foreign object or liquid gets inside the unit,
turn it off immediately. Remove the power cord from the
AC outlet. Consult your dealer for repair. Using the unit in
this condition is a fire and electrical shock hazard.
CAUTION
Keep this unit away from the following locations:
- Locations exposed to oil splashes or steam, such as near
cooking stoves, humidifiers, etc.
- Unstable surfaces, such as a wobbly table or slope.
- Locations exposed to excessive heat, such as inside a car
with all the windows closed, or places that receive direct
sunlight.
- Locations subject to excessive humidity or dust
accumulation.
Do not place the power cord close to a heater. It may melt,
causing fire or electrical shock.
Hold the power cord plug when disconnecting it from an AC
outlet. Never pull the cord. A damaged power cord is a
potential fire and electrical shock hazard.
Do not touch the power plug with wet hands. Doing so is a
potential electrical shock hazard.
This unit has ventilation holes at the front, rear & top to
prevent the internal temperature rising too high. Do not block
them.
Blocked ventilation holes are a fire hazard.
In particular, do not
- place the unit on its side or upside down.
- place the unit in any poorly-ventilated location such as a
bookcase or closet (other than on the dedicated rack).
- cover the unit with a table cloth or place it on a carpet or
bed.
Allow enough free space around the unit for normal
ventilation.
This should be: 5 cm at the sides, 10 cm behind, and 10 cm
above.
If the airflow is not adequate, the unit will heat up inside and
may cause a fire.
To relocate the unit, turn the power switch off, remove the
power plug from the AC outlet, and remove all connecting
cables. Damaged cables may cause fire or electrical shock.
Use only thick speaker cables when connecting speakers to
amplifier outputs. Use of cables type 40/36 or thicker is
recommended for connecting low impedance speakers to
avoid power loss in the cables, as heavy current flows
through the cables. Using other types of cables is a fire
hazard.
Turn off all musical instruments, audio equipment, and
speakers when connecting to this unit. Use the correct
connecting cables and connect as specified.
Always lower the volume control to minimum before
turning on the power to this unit. A sudden blast of sound
may damage your hearing.
Do not use this amplifier for any purpose other than
driving loudspeakers.
Be sure of proper impedance of 2/4/8 ohm when used for
STEREO/PARALLEL configuration & 4/8 ohm
recommended when used in BRIDGE mode.
If you know you will not use this unit for a long period of
time, such as when going on vacation, remove the power
plug from the AC outlet. Leaving it connected is a
potential fire hazard.
When operating amplifier on a generator, make sure it
is switched “OFF” till generator voltages has stabilized
& then only switch “ON” amplifier.
Installation
Operation
In case an abnormality occurs during operation
Installation
Operation
3

Tips for Safe Operation
The 3 core AC mains cable should be terminated with this
AC mains plug by connecting brown/red wire on live pin
(L), black/blue wire on neutral pin (N) and yellow/green
wire on earth pin (E).
The amplifier must be connected to an AC earthed mains
outlet that can delivered the maximum power required.
The use of extension cables or adaptors should be avoided
as this can jeoparadize correct power delivery to the
amplifier.
All connections must only be carried out or changed
with the amplifier switched OFF. Ensure proper
impedance matching while in use for BRIDGE mode
applications. For continuous safe operation, resultant
impedance of the speakers 8 ohm/4 ohm is recommen-
ded.
For 2 ohm/4 ohm applications, it is recommended
to use speakon connectors only. Use of cable 40/36
or thicker is recommended to prevent power
losses.
The level of input signal should not exceed the
specified input sensitivities. Excessive input signal
levels result in over driving of input circuit which
leads to saturated / distorted output at speaker
terminals.
Do not operate the amplifier with continuously
blinking CLIP LED. The respective volume control
of the channels must be adjusted so that the output
level does not clip and distort. Do not obstruct the
front or back of the amplifier for necessary intake of
air.
4

Contents Page No.
Features / General Description of Product....................................................................6
Front Panel Controls & Features...................................................................................7
Rear Panel Controls & Features....................................................................................8
Input-Output Connections...........................................................................................10
Setup & Operations.....................................................................................................11
Typical Applications....................................................................................................14
Protections & Installations..........................................................................................17
Trouble Shooting.........................................................................................................18
Specifications..............................................................................................................20
Notes............................................................................................................................23
5

Features / General Description of Product
Rugged 19” rack mountable design of chassis.
Low THD and high damping factor for excellent sound quality.
Slide Switches For 1) Mode selection ( Mono / Stereo / Bridge)
2) Sensitivity ( 0.775 V / 1V / 1.4 V)
3) Low - cut (30Hz) (ON / OFF )
4) Ground Lift ( GND / LIFT)
5) Limiter
6) HF Limiter
This owners Manual covers 4 models, DPA 2000, DPA 3200, DPA 4500 & DPA 5000 power amplifiers. through
this manual carefully before beginning use, so that you will be able to take full advantage of amplifier’s superlative features
and enjoy trouble free operation for years to come. After reading through the manual, please store it in a safe place.
Please read
Thank you for your purchase of the STUDIOMASTER DPA Series power amplifiers. These amplifiers fully incorporate
STUDIOMASTER’s renowned technology and offers high reliability, rock solid stability and superb acoustic
characteristics.
Balanced / Unbalanced input signal through parallel XLR in both channels.
Twin tunnel cooling with front to back airflow.
Limiter circuit protects the amplifier and speaker from being over driven because of high input level signal.
Designed with a sophisticated VHF limiter that reduces the risk of HF stress, and protects your speakers, particularly
HF units.
Output termination on 4 way speakon Connectors and Binding posts for each channels.
Indicator LEDs for Signal, Mode Selection. Clip, Protect, Power ON,
Extensive protection circuitry for Overheat, Overload, DC, Output short circuit.
High current torroidal transformer which provides excellent regulation and minimized hum & noise.
6
*Please retain original packing should you have to return the unit for the repairs.

Front Panel Controls & Features
1 Master switch
2 Power ON indicator light
3 Volume control
4 Signal indicator
5 Clip indicator
6 indicatorProtect
Switches the unit on and off, interrupting both phases.
When lit, this blue LED indicates that amplifier is ON.
Used for adjusting the volume of the channel.
Green LED that indicates the presence of the signal in the final stage. It lights up with signals higher than - 20dB.
This red LED lights up to indicate that the internal limiter has been activated to eliminate clip. When the limiter is
activated, it indicates that the maximum amplification has been reached. When it lights up continuously, this means
there is an excessive signal input.
Red LED that indicates the mute status of the channel and is lit for the following reasons:
switch on delay (3 seconds), presence of continuous voltage on the channel output, short circuit, thermal protection of
the channel, thermal protection of the transformer.
Class H Professional Power Amplifier
-6
-10
-15
-30 -1
-3
-80 0dB
-6
-10
-15
-30 -1
-3
-80 0dB
O
CH 2CH 1
POWER
I
SIGNAL
CLIP
PROTECT
POWER
POWER
Class H Professional Power Amplifier
-6
-10
-15
-30 -1
-3
-80 0dB
-6
-10
-15
-30 -1
-3
-80 0dB
O
SIGNAL
CLIP
POWER
I
PROTECT
CH 2CH 1
1
3
3
44
5
6
56
6
5
424
5
6
3
3
2
1
7

Rear Panel Controls & Features
1 Balanced XLR input
3 CH 1 output speakon connector
2 Link Out
To Cascade amplifiers.
4 CH 2 output speakon connector
5 CH 1 output binding post.
6 CH 2 output binding post.
7 Power cable
8 Configuration switch
9 Air Outlet grill
Use this connector for picking up the amplified signal of CH 1 and signal for bridged configuration.
Use this connector for picking up the amplified signal of CH 1 and signal for bridged configuration.
Use this connector for picking up the amplified signal of CH 2.
Use this connector for picking up the amplified signal of CH 2.
Use this cable for supplying power to unit.
This three way switch configures the amplifier for the three working modes: parallel, stereo and bridge.
The air sucked from the front grills is thrown out from these grills. Do not obstruct the grills. The air filter
whenever necessary.
This XLR connector takes the signal (balanced/unbalanced) for driving the channel. If the signal is unbalanced, pin 2
can be used for the signal and pin 3 connected to the earth.
7
9
6
2
9112 11 4
810
21810 3
14
14 35
513
13
2
21
9 9
1 12 11 467
15
15
DPA-2000
DPA-3200,4500 & 5000
8
0 9 0 3 0 1 0 8 0
30Hz
LOWCUT
HF
PROTECTION
LIMITER
INPUT
GROUND
LIFT
T16A 250VAC
0 9 0 3 0 1 0 8 0
30Hz
LOWCUT
HF
PROTECTION
LIMITER
INPUT
GROUND
LIFT

This switch activates limiter when in ON position. The limiter prevents distortion of the output level when its gets
overloaded. When the output level exceeds its maximum, an internal adjustment will be made to prevent overloading.
The limiter is specially designed to safeguard connected full-range speakers. The high tone piezo drivers of these
speakers are now protected against distortion and harmonic signals which are the result of over steering the amplifier.
When the amplifier is used as a subwoofer amplifier then the limiter has to be switched off to set the extra “punch”.
14 Limiter
It is a protection for the amplifier against HF. In case there is high amplitude HF signal at the output, it shuts down
the amplifier thus protecting the internal circuitry and HF drivers of a speaker system.
Presence of prolonged, large amplitude, high frequency output can damage the speakers as well as the internal circuit
of the amplifier. The HF limiter circuit continuously monitors the output and shuts down the amplifier, if the high
frequency persists for more than 10-15 seconds. The HF limiter has no effect on normal music.
15 HF Limiter
Mains fuse secures the amplifier & wires against defects, Replace this only with the same type & rating.
13 Fuse
9
Low cut switch filters the low frequencies from the input signal. Cut off frequency is 30 Hz when it is selected. The
filter protects the cone of the speakers against unwanted and inaudible low frequencies.
12 Low cut
10 Sensitivity
This switch is used to select sensitivity to either 0.775V, 1V or 1.2V depending on the source.
Allows circuit & chassis grounds to be separated in case of ground loops.
11 Ground lift

Input-Output Connections
FIG. 1 FIG. 2
FIG. 3
FIG. 5 FIG. 6
FIG. 4
PARALLEL / STEREO OUTPUT CONNECTIONS
PARALLEL / STEREO BINDING POST CONNECTIONS BRIDGE MODE BINDING POST CONNECTIONS
UNBALANCED INPUT CONNECTIONSBALANCED INPUT CONNECTIONS
BRIDGE OUTPUT CONNECTIONS
(CH 1 OUTPUT CONNECTOR)
XLR XLR
-STEREO -STEREO
-VE OUTPUT
+VE OUTPUT
+VE OUTPUT
+VE OUTPUT
-VE OUTPUT
-VE OUTPUT
CH1 OUTBINDING POST CH1 OUTBINDING POST
+STEREO/+BRIDGE +STEREO/+BRIDGE
+STEREO/-BRIDGE +STEREO/-BRIDGE
CH2 OUTBINDING POST CH2 OUTBINDING POST
-STEREO -STEREO
10

Setup & Operation
Stereo Mode Configuration
In STEREO mode, both channels 1 & 2 are fully independent of each other. The balanced / unbalanced inputs can be
connected either to a stereo signal source or two independent mono signal sources. Each channel can separately drive
loudspeaker loads of 8 ohm or 4 ohm or 2 ohm.
Connect the Left and Right outputs of a mixer to a channel
1 and 2 inputs of the amplifier respectively. Inputs can be
wired as per fig.1 & 2 (Input Connections for Balanced
and Unbalanced Mode)
Connect a speaker system (8 ohm / 4 ohm / 2 ohm) on the
output terminal of each channel.
Either use the speakon connector & wire these as per fig.3
(Output Connections for Stereo / Parallel Mode) or use
Binding Post as per wire diagram of fig. 5.
To select STEREO mode, keep the slide switch,
provided at rear panel, in STEREO position.
Adjust the individual volume controls of each channel
on the front panel to obtain the desired output level.
The level indicator LEDs glow to indicate the
presence of signal at the output terminals.
P A MIXER
CD PLAYER
SPEAKER SYSTEM
(IMP 8Ω / 4Ω / 2Ω)
SPEAKER SYSTEM
(IMP 8Ω / 4Ω / 2Ω)
SERIES
MICROPHONES
WIRELESS
MICROPHONE
11
0 9 0 3 0 1 0 8 0
30Hz
LOWCUT
HF
PROTECTION
LIMITER
INPUT
GROUND
LIFT
T16A 250VAC

Setup & Operation
Parallel Mode Configuration
When operating in PARALLEL mode, the signal source should be connected to the balanced / unbalanced inputs of
channel 1 only. Both channels provide similar outputs to their respective loudspeakers. Each channel can separately drive
loudspeaker loads of 8 ohm or 4 ohm or 2 ohm.
Connect the line output of a mixer to a channel 1 input of
the amplifier. Inputs can be wired as per fig.1 & 2 (Input
Connections for Balanced and Unbalanced Mode)
Connect a speaker system (8 ohm / 4 ohm / 2 ohm) on the
output terminal of each channel. Either use the speakon
connector & wire these as per fig.3 (Output Connections
for Stereo / Parallel Mode) or use Binding Post as per wire
diagram of Fig. 5.
TO select PARALLEL mode, keep the slide switch,
provided at rear panel in parallel position.
The desired output levels for both the channels are
adjustable by volume controls of respective channels.
The level indicator LEDs glow to indicate the
presence of signal at the output terminals.
P A MIXER
CD PLAYER
SERIES
MICROPHONES
WIRELESS
MICROPHONE
‘Y’- Cable
Note:- ‘Y’ cable to be used to make mono cable or use mono output of mixer.
SPEAKER SYSTEM
(IMP 8Ω / 4Ω / 2Ω)
SPEAKER SYSTEM
(IMP 8Ω / 4Ω / 2Ω)
12
0 9 0 3 0 1 0 8 0
30Hz
LOWCUT
HF
PROTECTION
LIMITER
INPUT
GROUND
LIFT
T16A 250VAC

Setup & Operation
Bridge Mode Configuration
For BRIDGE mode operation, the signal source should be connected to the balanced / unbalanced inputs of channel 1 only.
In this mode, the combined power output of both channels should be connected to a single loudspeaker load. The combined
loudspeaker load should not go below 4 ohm.
Connect the line output of a mixer to a channel 1 input of
the amplifier. Input can be wired as per fig.1 & 2 (Input
Connections for Balanced and Unbalanced Mode)
Connect a speaker system (8 ohm/4 ohm) on the speakon
output of channel 1 only. Either use the speakon
connectors and wire these as per fig.4 (Output Connections
for Bridge Mode) or Binding Post connections as per fig. 6.
To select BRIDGE mode, keep the slide switch,
provided at rear panel, in Bridge position and ensure
that the bridge LED located on the back panel glows.
The desired output levels of both the channels are
adjustable by volume control of channel 1 only.
The level indicator LEDs glow to indicate the
presence of signal at the output terminals.
MICROPHONES
P A MIXER
CD PLAYER
SERIES
WIRELESS
MICROPHONE
‘Y’- Cable
Note:- ‘Y’ cable to be used to make mono cable or use mono output of mixer.
SPEAKER SYSTEM
(IMP 8Ω / 4Ω)
13
0 9 0 3 0 1 0 8 0
30Hz
LOWCUT
HF
PROTECTION
LIMITER
INPUT
GROUND
LIFT
T16A 250VAC

Typical Applications
Stereo Mix Plus Subwoofers
Connect the left and Right outputs of the Audio mixing
console to the respective inputs of the Active Crossover.
Connect the Left and Right High frequency output of the
active crossover to the respective input channels 1 & 2 of
amplifier 1. Inputs can be wired as per fig. 1 & 2 (Input
Connections for Balanced and Unbalanced Mode)
One number of full range loudspeaker system can be
connected to each of the channels of amplifier 1. The
output connectors should be wired as per fig. 3 (Output
Connections for Stereo / Parallel Mode) for speakon or
fig. 5 for Binding Post connections.
Amplifier 1 will be used in stereo mode. Keep the slide
switch of amplifier 1 in stereo position.
Feed the Left low frequency output signal of the crossover
to channel 1 input of amplifier 2. Inputs can be wired as
per fig. 1 & 2 (Input Connections for Balanced and
Unbalanced Mode)
The high powered subwoofer system can be connect-
ed to the channel 1output of amplifier 2. Output
speakon connectors can be wired as per fig. 4 (Output
Connections for Bridge Mode) or fig. 6 for Binding
Post connections.
Amplifier 2 will be used in bridge mode. Keep the
slide switch of amplifier 2 to BRIDGE position to
activate bridge mode as indicated by the glow of
BRIDGE LED, make sure that LOW CUT switch is
in OFF position.
Finally adjust the volume control of channel 1 & 2 in
amplifier 1 to control the level of their respective
position to get desired power. Also, adjust the volume
control of channel 1 in amplifier 2 to control the
levels of their respective position to get desired
power.
P A MIXER
(Fullrange
2/3 way system)
(Fullrange
2/3 way system)
Sub Output
Hi Output
ACTIVE CROSSOVER
Input
Sub Output
(Subwoofer)
MICROPHONES
STEREO KEYBOARD
HEADPHONE
SERIES
WIRELESS
MICROPHONE
30Hz
LOW CUT
AMPLIFIER 1 (Stereo Mode)
AMPLIFIER 2 (Bridge Mode)
14
090301080
30Hz
LOWCUT
HF
PROTECTION
LIMITER
INPUT
GROUND
LIFT
T16A 250VAC
090301080
30Hz
LOWCUT
HF
PROTECTION
LIMITER
INPUT
GROUND
LIFT
T16A 250VAC

Typical Applications
Stereo Mode - Cascade Configuration
Connect the Left and Right outputs of the Audio mixing
console to the channel 1 & 2 (XLR) of amplifier 1.
Connect CH 1 LINK OUT input of amplifier 1 to CH 1 IN
(XLR) of amplifier 2. Similarly make connections for
CH 2.
Speakers can be connected to respective output but
ensure that resultant impedance is not less than 2 ohms.
The input can be wired fig. 1 & 2 (Input Connections for
Balanced and Unbalanced Mode)
The speaker connections of amplifier 2 are done in a
similar way as for amplifier 1.
Amplifier 1 and 2 will be used in stereo mode.
Keep the slide switch of amplifier 1and 2 in stereo
position.
Adjust the volume controls of channel 1 & 2 of both
the amplifiers to control the levels of their respective
Speakers.
Finally any adjustments in the total quantity of the
sound, if required, can be made from the audio
mixing console.
P A MIXER
(Resultant Imp = not < 2Ω) (Resultant Imp = not < 2Ω)
(Resultant Imp = not < 2Ω) (Resultant Imp = not < 2Ω)
AMPLIFIER 2 (Stereo Mode)
AMPLIFIER 1 (Stereo Mode)
MICROPHONES
SERIES
CD PLAYER
WIRELESS
MICROPHONE
15
0 9 0 3 0 1 0 8 0
30Hz
LOWCUT
HF
PROTECTION
LIMITER
INPUT
GROUND
LIFT
T16A 250VAC
0 9 0 3 0 1 0 8 0
30Hz
LOWCUT
HF
PROTECTION
LIMITER
INPUT
GROUND
LIFT
T16A 250VAC

Typical Applications
Parallel Mode - High Power Dual Channel Configuration
Connect the left line output of the Audio mixing console to
the channel 1 input (XLR) of amplifier 1.
Connect CH 1 LINK OUT (XLR) of amplifier 1 to the
channel 1 input (XLR) of amplifier 2. The XLR input can
be wired as per fig. 1 & 2 (Input Connections for Balanced
and Unbalanced Mode)
The Left speaker stack compromises of four nos. speaker
systems. Each speaker is individually connected to the four
speaker outputs available from amplifier 1(channel 1 & 2)
and amplifier 2 (channel 1 & 2).
Output speakon connectors to be wired as per fig. 3
(Output Connections for Stereo/ Parrallel Mode) or fig. 5
for Binding Post connection.
Amplifier 1 & 2 will be used in Parallel mode.
Keep the slide switch of amplifier 1 and 2 in Parallel
position.
Similarly, connect the Right line output of the Audio
mixing console to the channel 1 input (XLR) of
amplifier 3. Also connect CH 1 LINK OUT (XLR)
of amplifier 3 to the channel 1 input (XLR) of
amplifier 4.
The Right speaker stack’s connections are done in a
similar way as for left speaker stack’s connections.
Amplifier 3 and 4 will also be used in Parallel mode.
Adjust the volume controls of both the channel in all
the four amplifier to control the levels of their
respective speakers.
Finally any adjustments in the total quality of the
sound, if required, can be made from the audio
mixing console.
P A MIXER
SPEAKER
SPEAKER
SPEAKER
SPEAKER
SPEAKER
SPEAKER
SPEAKER
SPEAKER
RIGHT
BACK
LEFT
BACK
AMPLIFIER 2 (Parallel Mode)
AMPLIFIER 3 (Parallel Mode)
AMPLIFIER 1 (Parallel Mode)
AMPLIFIER 4 (Parallel Mode)
MICROPHONES
SERIES
HEADPHONE
STEREO KEYBOARD
WIRELESS
MICROPHONE
16
090301080
30Hz
LOWCUT
HF
PROTECTION
LIMITER
INPUT
GROUND
LIFT
T16A 250VAC
090301080
30Hz
LOWCUT
HF
PROTECTION
LIMITER
INPUT
GROUND
LIFT
T16A 250VAC
090301080
30Hz
LOWCUT
HF
PROTECTION
LIMITER
INPUT
GROUND
LIFT
T16A 250VAC
090301080
30Hz
LOWCUT
HF
PROTECTION
LIMITER
INPUT
GROUND
LIFT
T16A 250VAC

Protections & Installations
Thermal Protection
Output Devices
Due to excessive heating of output devices, the thermal
protection circuits brings the audio signal to mute status.
Onset of thermal protection circuit is indicated by glowing
of Protect LED in each channel. To restore normal
operating condition, it is recommended to switch off the
amplifier, wait till it cools down & then turn on the
amplifier for normal operation.If the problem persist
rectify the cause.
DC Protection
Inbuilt circuitry is provided to protect the loudspeaker
from any offset DC voltages.
Overload / Short Circuit Protection
Protection circuit is provided in both channels for
the safety of output devices in case of overloading
or mismatching of impedances at outputs. This
circuit brings the input signals to respective
channels are pressed.
AC Mains Fuses
DPA 2000 - T 12.5AL/250V
DPA 3200 - T 20AL/250V
DPA 4500 - T 20AL/250V
DPA 5000 - T 25AL/250V
Table Top Usage
The ‘U’ handles are helpful in easy portability of
the amplifier for table top usage.
19” Rack Installation
The amplifier is designed for use in a standard 19” rack
with height of 2U units (DPA 2000) and 3U units (DPA
3200, DPA 4500 & DPA 5000).
In order to provide sufficient support base to the heavy
amplifier, it is essential to use the 19” rack system with
side support channels.
The installed amplifier, therefore, is well supported by the
side support channels as well as rigidly fixed on the rack
through the two rack mount side brackets dully fitted with
‘U’ type handles, as shown in the figure below.
POWER
Class H Professional Power Amplifier
-6
-10
-15
-30 -1
-3
-80 0dB
-6
-10
-15
-30 -1
-3
-80 0dB
O
SIGNAL
CLIP
POWER
I
PROTECT
CH 2
CH 1
POWER
Class H Professional Power Amplifier
-6
-10
-15
-30 -1
-3
-80 0dB
-6
-10
-15
-30 -1
-3
-80 0dB
O
SIGNAL
CLIP
POWER
I
PROTECT
CH 2
CH 1
17

Trouble Shooting
Key to LED symbols:
GLOWING
PROTECT
PROTECT
PROTECT
PROTECT
POWER
POWER
POWER
POWER
CLIP
CLIP
CLIP
CLIP
SIGNAL
SIGNAL
SIGNAL
SIGNAL
BLINKING OFF
Condition: Normal operation
Possible Reason:
The amplifier is in normal operation
1) Indication:
2) Indication:
3) Indication:
Condition: Low output
Possible Reason:
Check if the level of the input signal is too low. Check the signal source is operating and the input cable is intact. The
channel volume control setting is not at desired level. Similar conditions may occur in PARALLEL and BRIDGE
mode.
Condition: No power to the amplifier
Possible Reason:
The amplifier power switch may be off. The amplifier may not be plugged into the power receptacle. Confirm that the
AC outlet works by plugging in another device. If too many amplifier are used on one outlet, the building’s circuit
breaker may trip and shut off power. An overload in bridge mode may cause tripping of main switch on front panel.
An amplifier which keeps shutting off may have a serious internal fault. Turn it off, remove AC power cord and get the
amplifier serviced by a qualified technician.
4) Indication:
Condition: No Sound
Possible Reason:
The amplifier goes in Protect mode due to excessive input signal, speaker impedance mismatch or output short circuit.
Check the speaker impedance and speaker wiring for stray strands or breaks in the insulation. Reduce the volume
control, for desired output.
temperature either of output devices or power transformer. Switch off the amplifier to cool down. Check if the fan is
working, proper ventilation is provided and output connections are as recommended. Similar conditions may occur in
PARALLEL and BRIDGE mode.
The amplifier might also go in Protect mode because of overloading or poor ventilation resulting into the rise in
18

5) Indication:
6) Indication:
Condition: Distorted Sound
Possible Reason:
The input signal level may be too high. So turn down the amplifier level controls. Check the level of the input source.
If it is high then reduce the input signal level. The amplifier should never be operated at a level which causes the
CLIP LED to illuminate constantly. Similar conditions may occur in PARALLEL and BRIDGE mode.
Condition: Either low or no sound
Possible Reason:
This could be due to wrong speakon connections or faulty speaker. Check the output speakon connections as per fig. 4
on page no. 10 (Output Connections for Bridge Mode)
FOLLOW SAME TROUBLE SHOOTING INSTRUCTIONS FOR CH 2 ALSO.
PROTECT
PROTECT
POWER
POWER
CLIP
CLIP
SIGNAL
SIGNAL
7) Condition: Hum
Possible Reason:
Move cabling and signal sources to identify the problematic areas in the system. Cables with faulty shielding are a
frequent entry point for him. In the situation where the hum is present in the installations due to close looping of
ground, cut the jumper on the input PCB to isolate input ground to mains earth.
8) Condition: Hiss
Possible Reason:
Unplug the amplifier input to confirm whether the hiss is coming from the source or a device upstream. The erratic or
popping noises indicate an electronic fault in the offending unit.
19

Specifications
240V/50Hz
T12.5AL/250V T20AL/250V T20AL/250V T25AL/250V
580 x 570 x 150mm 580 x 570 x 195mm
DC, short circuit, DC, short circuit, Soft-Start
over head, over load over head, over load, limit
20kΩ balanced
10kΩ unbalanced
> 200 : 1 (8Ω) > 300 : 1 (8Ω)
20V/uS
16V/uS
< 0.05% @ 8Ω 1kHz
Output power
DPA 2000 DPA 3200 DPA 4500 DPA 5000
Stereo @ THD 1%
Bridged @ THD 1%
EIA rating Parallel Mode @ THD 1%
EIA rating Bridge Mode @ THD 1%
Frequency Response
THD + N @ rated power single
channel in 8 Ω load
Damping Factor
Slew Rate
Signal to Noise Ratio
Crosstalk
Input Sensitivity
Input Impedance
Protection devices
Input Connector
(per channel)
Output Connector
(per channel)
Cooling
Front panel controls
Indicators
Supply Voltage
Fuse Rating
Dimensions (H x W x D)
Net Weight
Shipping Carton Size ( W x D x H )
2Ω 2 x W RMS 1040
2Ω 2 x 1600 RMS
2Ω 2 x 1600W RMS
2Ω 2 x 2250 RMS
2Ω 2 x 2200W RMS 2Ω 2 x 2600W RMS
2Ω 2 x 3400 RMS 2Ω 2 x 3900 RMS
4Ω 2 x W RMS 780
4Ω 2 x 1012RMS
4Ω 2 x 1200W RMS
4Ω 2 x 1650 RMS
4Ω 2 x 1650W RMS 4Ω 2 x 1950W RMS
4Ω 2 x 2350 RMS 4Ω 2 x 2800 RMS
8Ω 2 x W RMS 520
8Ω 2 x 650 RMS
8Ω 2 x 800W RMS
8Ω 2 x 1050 RMS
8Ω 2 x 1100W RMS 8Ω 2 x 1300W RMS
8Ω 2 x 1400 RMS 8Ω 2 x 1600 RMS
4Ω W RMS 2080
4Ω 2800 RMS
4Ω 3200W RMS
4Ω 3600 RMS
4Ω 4400W RMS 4Ω 5000W RMS
4Ω 6000 RMS 4Ω 7800 RMS
8Ω W RMS 1560
8Ω 1800 RMS
8Ω 2400W RMS
8Ω 2750 RMS
8Ω 3300W RMS 8Ω 3900W RMS
8Ω 4225 RMS 8Ω 5600 RMS
20Hz-20kHz (+0/-0.5dB) 20Hz-20kHz (±0.5dB)
> 95 dB ‘A’ Weighted > 95 dB ‘A’ Weighted > 93 dB ‘A’ Weighted
> 70dB @ 1kHz 8Ω
0.775 Vrms
1.0 Vrms
1.4 Vrms
For rated power (4Ω)
XLR
4 WAY SPEAKON Connector & BINDING POST for each channel
Twin Tunnel cooling with front -back air flow
Volume Controls for CH 1 & CH 2
Power On, Signal, Limit, Protect, Bridge
88 x 483 x 455mm 130 x 483 x 455mm
2 Rack U 3 Rack U
27.6 kg 40.3 kg 44 kg 46.75 kg
20
MODELS