HJH DP5.0 User manual

DP5.0
The information contained in this manual is subject to change without notice.
No part of this manual may be reproduced or transmitted in any form or by any means,
electronic or mechanical, including photocopying and recording of any kind.
SWITCHING POWER AMPLIFIERS WITH PFC
USER'S MANUAL
CH1.-dB CH2.-dB
Professional Power Amplifier DP5.0

HJH Products
Service Information Form
Owner's Name:
Shipping address:
Street:
City:
Zip Code:
Country:
Phone Number: Fax Number:
Email:
MODEL: SERIAL:
NUMBER:
Place of Purchase:
Name of Dealer:
Full Address:
DATE OF PURCHASE:
Nature of the problem
(Be sure to describe the conditions that existed when the problem occurred and what
attempts were made to correct it.)
Other equipment in your system
If warranty has expired, payment method: Cash Check Visa Master
card number: Signature:
Enclose this form with the defective unit. Do not mail separately.

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DP5.0 Switching PowerAmplifierDP5.0 Switching PowerAmplifier
LIMITED WARRANTY
THE WARRANTY
For a period of One (1) year from the date of delivery to the original purchaser (as shown on the original invoice or sales
receipt), HJH International Group Limited warrants to the ORIGINAL OWNER of each product (provided it was purchased
at an Authorized HJH Dealer) that it is free of defects in materials and workmanship and that each product will meet or
exceed all factory published specifications for each respective model. HJH agrees to repair or replace (at its discretion) all
defective parts at no charge for labor or materials; subject to following provisions:
WARRANTY VIOLATIONS
HJH shall take no responsibility for repair or replacement as specified under this warranty, if the damaged product has
been subject to misuse, accident, neglect or failure to comply with normal maintenance procedures; or if the serial
number has been defaced, altered or removed. Nor will HJH accept responsibility for, or resulting from, improper
alterations or unauthorized parts or repairs. This warranty does not cover any damage to speakers or any other
consequential damage resulting from breach of any written or implied warranty.
HJH WARRANTY PROVISIONS
HJH will remedy any defect, regardless of the reason for failure (except as excluded ) by repair, or replacement. HJH will
remedy the defect and ship the product within a reasonable time after receipt of the defective product at an HJH
Authorized Service Center.
TO OBTAIN WARRANTYSERVICE
In the event that an HJH product requires service, the Owner must contact HJH or an Authorized HJH Service Center to
receive an R.A.N. ( Return Authorization Number) and instructions on how to return the product to the HJH Authorized
Service Center, or to the factory. HJH (or itsAuthorized Service Center) will initiate corrective repairs upon receipt of the
returned product. Please save original carton and all the packing materials in case shipping is required. All products being
returned to the factory or service center for repairs must be shipped pre-paid.
If the repairs made by HJH or the HJH Authorized Service Center are not satisfactory, Owner is instructed to give written
notice to HJH. If the defect or malfunction remains after a reasonable amount of attempts by HJH to remedy the defect or
malfunction, the Owner shall then have the option to elect either a refund or replacement of said HJH product free of
charge. The refund shall be an amount equal to but not greater than the actual purchase price, not including any taxes,
interest, insurance, closing costs and other finance charges (minus reasonable depreciation on the product). If a refund is
necessary, the Owner must make the defective or malfunctioning product available to HJH free and clear of all liens or
other restrictions.
MODIFICTTIONS OF EQUIPMENT
HJH reserves the right to modify or change equipment (in whole or part) at any time prior to delivery thereof, in order to
include therein electrical or mechanical improvements deemed appropriate by HJH; but without incurring any liability to
modify or change any equipment previously delivered, or to supply new equipment in accordance with any earlier
specifications.
DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES
YOU,THE OWNER, ARE NOT ENTITLED TO RECOVER FROM HJH ANY INCIDENTAL DAMAGES RESULTING
FROM ANY DEFECT IN THE HJH PRODUCT. THIS INCLUDES ANY DAMAGE TO ANOTHER PRODUCT OR
PRODUCTS RESULTING FROM SUCH ADEFECT.
WARRANTY ALTERATIONS
No person has the authority to enlarge, amend, or modify this Warranty. This Warranty is not extended by the length of
time which the Owner is deprived of the use of product. Repairs and replacement parts provided pursuant to the
Warranty shall carry only the non-expired portion of the Warranty.
THIS STATEMENT OF WARRANTY SUPERSEDES ALL OTHERS CONTAINED IN THIS MANUAL
NOTES:
WEEE Mark
If you wantto dispose ofthis product, donot mix withgeneral
household waste. Thereare separate collectionsystems for used
electronic products inaccordance with legislationunder the WEEE
Directive (Directive 2002/96/EC)and is effectiveonly within the
European Union.

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DP5.0 Switching PowerAmplifierDP5.0 Switching PowerAmplifier
The information furnished in this manual does not include all of the details of design and engineering of this
particular product; not does it cover every possible application or situation concerning its usage, which may
occur during the installation, operation or maintenance of said HJH product.
Service
This unit has very sophisticated circuitry and should only be serviced by a fully trained
technician.
This is why each unit bears the following label:
To prevent electric shock, do not remove covers. No user serviceable parts inside. Refer
servicing to a qualified technician.
Worldwide Service
Service may be obtained from your local authorized service center. To obtain service, simply
present your sales receipt as proof of purchase along with the defective unit to an authorized
service center. They will handle the necessary paperwork and repair. Remember to transport
your unit in the original factory packaging.
1. When sending a HJH product to the authorized service center for service, be sure to fill out
the service information form that is enclosed at the end of this manual and include it inside
your unit's shipping pack. Do not send the service information form separately.
2. To ensure the safe transportation of your unit to the authorized service center, ship it in an
original factory-packing container.
3. Do not ship the unit in any kind of rack. Ignoring this warning may result in extensive damage
to the unit and the equipment rack. Accessories are not needed. Do not send the instruction
manual, cables and any other hardware.
IMPORTANT
THE PRODUCT REQUIRES CLASS 2 OUTPUT WIRING.
WARNING
TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOISTURE!
Magnetic Field
CAUTION: Do not locate sensitive high-gain equipment such as preamplifiers or
tape decks directly above or below this unit. Because this amplifier has a high
power density, it has a strong magnetic field which can induce hum into
unshielded devices that are located nearby. This field is strongest just above and
below the unit. If an equipment rack is used, we recommend locating the
amplifier(s) at the bottom of the rack and the preamplifier or other sensitive
equipment at the top.
TO PREVENT ELECTRIC SHOCK, DO
NOT REMOVE TOP OR BOTTOM
COVERS. NO USER SERVICEABLE
PARTS INSIDE. REFER SERVICING
TO QUALIFIED SERVICE
PERSONNEL. DISCONNECT
POWER CORD BEFORE REMOVING
REAR PANEL COVER TO ACCESS
GAIN SWITCH.
Shock Hazard - Do Not Enter
Choc Hasard - N*entrent
Schocke Hazard - Test Nicht
Betrete
Urto Hazard - Do Non Entrano
CAUTION
The exclamation point triangle is used to alert the user to important operating
and/or maintenance instructions.
Printed on recycled paper.
The lightning bolt triangle is used alert the user to the risk of electric shock

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DP5.0 Switching PowerAmplifierDP5.0 Switching PowerAmplifier
Introduction
Congratulations on your purchase of a DP5.0 audio poweramplifier. We would like to thank
you for yourconfidence in usand our products.
All the components were specially selected. Although the amplifier was designed to allow
straightforward and uninterrupted operation, improper handling or incorrect installation
could damage thepower amplifier.
Your amplifier represents the latest technology in power amplifier design. Please read this
manual carefully asit contains informationvital to thesafe operation ofyour amplifier.
Unpacking
Check the cartonbox and itscontents immediately tosee if thereis any signof damage.
Upon unpacking inspect the amplifier, if you detect any damage inform the forwarding
agentwithout delay andask for thedamage to bedocumented.
Claims can onlybe made againstthe forwarder agentby the consignee.
Be sure tosave the cartonand all packagingmaterials for thecarrier's inspection.
It's a good idea to save the carton and packing material even if the amplifier has arrived in
good condition. Should you ever need to ship the unit back to service office, or one of its
Service Center. Using only the original factory packaging will be the best way to save the
unit from carriernegligence.
Installation/Mounting
All DXP models amplifiers are 2- rack space units that can mount in a standard 19" rack.
Four front panelmounting holes areprovided.
Rear mounting earsgive additional supportespecially important inmobile sound systems.
The unit shouldnot to beinstalled in alocation with:
Toohigh ambient temperature,dust build-up orexcessive humidity;
Fog machines output'soriented to thearea of theamplifier;
Exhaust air ventilatorsand similar unitsnear the areaof the amplifier;
With permanent vibrations;
With excessive inductionor magnetic fieldsdue to tranformersand transmitters;
Power factor correction
DP5.0 is aamplifier constructor to use power factor correction. This unique feature ensures
that a predominantly resistive load is presented to the mains power supply, minimizing
current distortion and voltage/current displacement This leads to much improved perfor-
mance of the amplifier at high levels of output and avoids mains-voltage collapses, typical
of standard and switching power supplies. Another great advantage of this technology is
that its performance is, to a large extent, independent of the mains voltage. The rated
output power doesnot vary withload/line conditions.
The ShowAlways Goes On
DP5.0 is completely protected against every possible error in operation and is designed to
work under every condition. It gives you maximum power with maximum safety and
increases long-term reliability. Anticipating potential problems at the design stage means
your show alwaysgoes on!
SPECIFICATIONS
The DP5.0 amplifier has an automatic power factor correction system for a perfect main
network interface. The amplifier is a resistive load for the main network, minimizing the
reactive power and the harmonic distortion on the current. The system allows perfor-
mance to bemaintained even incircumstances of varyingthe mains voltage.
MODEL
Max output power
RMS at 1kHz and 1%THD
8 per channel (Watt)
4 per channel (Watt)
2 per channel (Watt)
8 bridged (Watt)
4 bridged (Watt)
THD at 1kHz and 1dB below clipping
Slew rate
Dampping Factor
Sensitivity
Input connectors
Link connectors
Mode Switch
Outut Conneet
Operation voltage, 230V/115V
Power factor cos( )
Soft Start
Power mode
Dimensions ( Wx D xH )
Unit ( mm)
Packing ( mm )
Weight ( kg)
Net Weight
Gross Weight
Max output power
8 (Watt)
4 (Watt)
2 (Watt)
DP5.0
1800
3300
5000
6600
10000-1
0.10%
55V/ s
1000
26dB/32dB/1.4V
XLR Female
XLR Male/Phonejack
Stereo/Bridge/Parallel
Speakon
98-242V
Yes
PFC Switching power
483 x 471x 89
575 x 568x 163
13.8
17.8
1300
2300
3200
(Note-1.Max output @4ohmsbridge with burstsignal 100ms)

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DP5.0 Switching PowerAmplifierDP5.0 Switching PowerAmplifier
CH1.-dB CH2.-dB
Professional Power Amplifier DP5.0
45
6
7
339
2
8
1
16
15
15
17 10
141312
1312
Front Panel
Rear Panel
1. Rack mountingears
Two frontpanel mounting holesare provided oneach mounting ear.
2. Fan intakegrill filter
One grill with foam filter is located on the front panel to prevent dust from entering the
amplifier. Foreasy cleaning ofthe filter thegrill is removable by simply pulling it off. The foam
filter should alwaysbe used. Thefan's variable speed control ensurelow noise operationand
adapt the quantity of air required from the actual temperature inside the unit.
Thanks to thisadvanced system lownoise is guarantee.Do not blockthis intake!
3. Input attenuator
Two front panel precision 41 steps input attenuator adjust level for their respective amplifier
channels. Minimum attenuation(-0dB) equals maximumoutput. In thebridge mode bothlevel
attenuator must be at the same position. We recommend that you set CH1 to the -0dB (full)
position.
4. Signal barLED
Each channel hasa bar LED, as the input signal strength increase,the green SIGNAL-30dB,
-24dB, -18dB, -12dB,-9dB, -6dB, -3dB,0dB LED indicatorslight respectively.
5. Clip/Limiter LED
Each channel has a LED that light at thereal clipping point (more than 0.5%T.H.D.)and also
indicates the inputsigned is compressedby amplifiers.
Parallel Mode (InputLink)
In parallel mode both channels' inputs are linked and receive the same signal. The parallel
mode is active if the Linkswitches are in position "PARA".Both level attenuators are active,
allowing you to set different levels for each channel.Note that only the inputs are connected
in parallel. This is NOT a parallel mono mode. Never connect either positive output terminal
to ground or in parallel.You may use the remaining input connectors to carry the signal to
other amps. NOTE:Alwaysturn off theLink switch whenusing the amplifierfor Bi-amping.
Figure 1
Stereo Mode
CHANNEL 1
CHANNEL 2
LOUDSPEAKERS
BRIDGE
PARALLEL
STEREO
CH 1
CH 2
MIXER
CAUTION: TURN OFF AMPLIFIER
BEFORE CHANGING THIS SWITCH
Bridge Mono Mode
CAUTION: TURN OFF AMPLIFIER
BEFORE CHANGING THIS SWITCH
LOUDSPEAKERS
MIXER
Only use the CH1 Input
CH 2 is notused in the mode
CHANNEL 1
CHANNEL 2
LOUDSPEAKERS
MIXER
CAUTION: TURN OFF AMPLIFIER
BEFORE CHANGING THIS SWITCH
Only use the CH1 Input
CH 2 is notused in the mode
Parallel Mono Mode
BRIDGE
BRIDGE
PARALLEL
PARALLEL
STEREO
STEREO
2-

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DP5.0 Switching PowerAmplifierDP5.0 Switching PowerAmplifier
6. Protect LED
Each channel has a Protect LED that will light when the load connected is lower than 1 Ohm
or amplifier broken.
7. Bridge LED
The Yellow active LEDilluminates to indicatethat the amplifieris work atbridge mode.
8. Power LED
The green active LED illuminates to indicate that the amplifier is turned on, and works
correctly.
9. ACpower switch
Use this toswitch on theamplifier.A soft-startsystem limits thestart-up surges.
10. Fan exhaustports
Heated air exitsthe amplifier through the exhaust ports, located on the rear of theamplifier
chassis. Be surenot to blockthis ports, especiallywhen rack mountingthe amplifier.
11. Inputconnectors
XLR female is provided on each channel for balanced or unbalanced input. Unfortunate
wiring, in the proximity of dimmers or other generalised phase controls, motors, trans-
former, etc. can cause interference into your system. You will hear loud humming or a
bumping noise in the loudspeakers. Balanced wiring suppresses these noises quite
significantly.
12. Impedance matching(OVPswitch)
The OVP switchesare located onthe rear panel.The OVP(Minimum Load Select)switches
Offer impedance matching,so you can drive the DP5.0into 2 ohms without increased heat
loss.
As stated earlier, the DP5.0 can produce 2300 watts into both, 2 and 4 ohms. Use lower
OVP settings when connecting to lower impedance loads as shown in table 1. As can be
seen in table1, the DP5.0can produce outputpower in excessof 2000 watts.
If the amplifier is going to operate above its maximum operating
0
temperature (90 C).The indicator first comes on as a warning to either turn down the input
level or check the cooling arrangements. Beyond the maximum temperature the amplifier
will mute the input signal. Once the cooling fans have brought the output heat sinks back to
normal operating temperaturethe input signalis un-muted.
Cooling Requirements
Amplifier use aforced air coolingsystem to maintaina low,even operating temperature.
Drawn by ainfinitely variable speedfans mounted insidethe unit, airenters through the
front
grills with dustfilter, andcourses through thecooling fins ofthe heatsinks, whichdissipates
power transistor heat,before exiting throughthe rear panelports. Make surethat there is
enough space aroundthe front ofthe amplifier toallow air toenter, andaround the unitsto
allow the heatedair to exit.If the ampis rack-mounted, donot use doorsor covers onthe
front and rearof the rack;the air mustflow through theamplifier without resistance.
Note: whatever typeof rack youare using, makesure that theheated air canescape freely,
and that thereis not resistanceto the intakeof cool airthrough the frontgrill.
Configuration
Use the configurationswitch and theinternal jumpers toconfigurate the amplifierto meet
your requirements. Thesetup must bedone with theunit switched off.With the switchesand
jumpers is possibleto configurate theamplifier for the following functions:
Stereo Mode (standard)
In stereo mode,the channels operate independently, withtheir input attenuatorscontrolling
the respective channel's level. Recommended minimumnominal load impedancefor stereo
operation is 4or 2 Ohms per channel (as indicated on the specifications). Loudspeakers are
connected to thespeakon outputs CH 1 or CH 2. For reference see
Bridged Mono Mode
In Bridged Monomode, both amplifier channels work with the same input signal, but with
inverse phases. Theresult is adoubling of theoutput voltage andthus double thepower on
the double impedance.If the amplifier is to be operated in Bridged Mono mode, ONLY one
input may beused CH1. Werecommend that youset them tothe -0dB (full)position.
Loudspeakers are connectedto the speakonoutput CH 1. For reference see Figure 1.
Figure 1
OVP SWITCH SETTING
-5 dB
220 W
430 W
830 W
1660 W
-4 dB
260 W
520 W
1000 W
2000 W
-2 dB
410 W
820 W
1600 W
3050 W [1]
0 dB
650 W
1300 W
2300 W
2900 W [2]
3200 W [1]
LOAD
16 ohms
8 ohms
4 ohms
2 ohms
CONFIGURATION
Stereo (2 channel)
Stereo (2 channel)
Stereo (2 channel)
Stereo (2 channel)
860 W
1660 W
3320 W
1040 W
2000 W
4000 W
1640 W
2400 W
4800 W
2600 W
4600 W
5800 W [1]
16 ohms
8 ohms
4 ohms
Bridge mono
Bridge mono
Bridge mono
2400 W [2]

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DP5.0 Switching PowerAmplifierDP5.0 Switching PowerAmplifier
13. Input Sensitivity/Gain
The standard settings are:1.4V,32dB,26dB,selection is independent for each channel. Use
this function to match the amplifier's sensitivity/gain with the other connected equipment.
As option, is possible adjust the unit for anysensitivity/gain.Note that every increase of the
gain will decreasethe S/N ratio.
14. Mode operationswitches
Setup these switchesfor the desired operation mode. For reference see
15. Speakon outputconnectors
The unit hasfour Speakon connectorsas outputs: CH 1 and CH 2. Every one permit the con-
nection of both channels for stereo operation or parallel mode. For bridge operation the
CH1 connector shouldbe used. For reference see
16. A.C.Power cable
The unit have one A.C. power cable. Beforeconnection, be sure that the cable is not frayed
or broken. The connection must be made only in a plug with the electrical ground wire sys-
tem.
17. S.N. label
Every unit hasa label indicating: the model, and the barcode serialnumber.
Figure 1.
Figure 1.
Operation
Grounding
There is noground lift switch or terminal on this amplifier.The signal groundis always
floating via aresistor to chassis, and the grounding system is automatic.If a potentialabove
0.6V is presentsin between signal ground and chassis ground, a shortcircuit is introduced
between the two,thereby enabling electrical protection. If a unit in thesystem is faulty, its
mains fuse willblow due to this automatic ground system. If howeveryou wish totie the sig-
nal ground tochassis, connect the XLR-connector`s shell lug to pin 1.In the interestof
safety never disconnectthe earth pin on the AC power cord.
For all unitsthat are FCC approved (radio interference), there is anAC mainsfilter. Thisfil-
ter needs thechassis ground for reference, otherwise a current loop isformed via thesignal
ground. Use thebalanced input to avoid hum and interference.
Connecting Power andCircuit size requirements
Amplifier's power requirementare rated at idle, at 1/8 and 1/3 power("severe" music condi-
tion).The maximum powercurrent draw rating is limited only by the internalfuses. Consult
the specification atthe end of this manual for the power eachamplifier will demand.Mains
voltage must alsobe correct and the same as that printed onthe rear ofthe amplifier.
Damage caused byconnecting the amplifier to improper AC voltage isnot covered byany
warranty.
Note: always switchoff and disconnectthe amplifier frommains voltage beforemaking
audio connections, andas an extra precaution, have the attenuators turned downduring
power-up.
Operating voltage
WARNING!
A labeljust below the mains cable onthe rear ofthe amplifier indicatesthe ACmains volt-
age for whichthe amplifier is wired. Connect the power cable only to theAC source referred
to on thelabel. The warrantywill not coverdamage caused byconnecting to thewrong type
of AC mains.
DP5.0 switch modeamplifiers use primary switching. The mainspower is beingrectified
directly in frontof the transformer, meaning thatthe power supplyis insensitive tothe mains
frequency .
If the powerplug is not appropriate for your country, itcan be cutoff and wiredto a suitable
connector in thefollowing way:
BLACK or BROWN LIVE
WHITE or BLUE NEUTRAL
GREEN or GREEN/ YELLOW EARTH
Once the AC connector is connected to a suitable AC supply, the amplifier can be started
with the power switch. When you power up the amplifier it takes a couple of seconds to
check its circuits(thisis known asthe soft start or slow start sequence), the fansthen blow
at high speed before going into idle, and the two bottom green LEDs come on to show the
output circuits arereceiving the correct rail voltage.