Audiopole PA 4-250 User manual

PA 4-250
USER’S MANUAL
4 CHANNEL 4 Ω /70 V /100 V POWER AMPLIFIER

1
Safety instructions …………………………………………………………………….. 2
1. Introduction ……………………………………………………………………….. 3
2. Features………………………………………………………………………….… 3
3. Controls and Settings…………………………………….…………………….… 4-5
4. Installations Hints …..…………………………………….……………………….. 6
5. Tec nical Specifications…..………………………………………………..……. 6
6. Malfunctions ……..……………………………………………………..……..….. 7
7. Warranty …………………………………………………………………………….. 7
Index

POWER SUPPLY
Ensure t at t e insource voltage (AC outlet) matc es t e voltage rating of t e product. Failure to do so could
result in damage to t e product and possibly t e user. Unplug t e product before electrical storms occur and
w en unused for long periods of time to reduce t e risk of electric s ock or fire.
2
EXTERNAL CONNECTION
Always use proper ready-made insulated mains cabling (power cord). Failure to do so could result in
s ock/deat or fire. If in doubt, seek advice from a registered electrician.
FUSE
To prevent fire and damage to t e product, use only t e recommended fuse type as indicated in t is manual. Do
not s ort-circuit t e fuse older. Before replacing t e fuse, make sure t at t e product is OFF and disconnected
from t e AC outlet.
PROTECTIVE GROUN
Before turning t e unit on, make sure t at it is connected to Ground. T is is to prevent t e risk of electric s ock.
Never cut internal or external Ground wires. Like wise, never remove Ground wiring from t e Protective Ground
Terminal.
OPERATING SAFETY INSTRUCTIONS
Read t ese instructions. Follow all instructions. Keep t ese instructions. Do not discard. Heed all warnings. Only
use attac ments/accessories specified by t e manufacturer.
T is symbol indicates t at t e disposal of t is product is submitted to local regulations. Please
contact your local dealer.
ISPOSAL
Important Safety Instructions
T is symbol, w erever used, alerts you to t e presence of un-insulated and dangerous voltages
wit in t e product enclosure. T ese are voltages t at may be sufficient to constitute t e risk of
electric s ock or deat .
T is symbol, w erever used, alerts you to important operating and maintenance instructions.
O NOT REMOVE ANY COVERS
Wit in t e product are areas w ere ig voltages may present. To reduce t e risk of electric s ock do not
remove any covers unless t e AC mains power cord is removed. Covers s ould be removed by qualified service
personnel only. No user serviceable parts inside.
POWER COR AN PLUG
Do not tamper wit t e power cord or plug. T ese are designed for your safety. Do not remove Ground
connections! If t e plug does not fit your AC outlet seek advice from a qualified electrician. Protect t e power
cord and plug from any p ysical stress to avoid risk of electric s ock. Do not place eavy objects on t e power
cord. T is could cause electric s ock or fire.
SERVICING
Refer all servicing to qualified service personnel only. Do not perform any servicing t en t ose instructions
contained wit in t is User’s Manual

Introduction
3
1
Features
2
T ank you for purc asing Audiopole PA 4-250. T is amplifier as 4 independents c annels of 250 W eac
w ic can drive loads of 4 O ms, 70 V and 100 V for Public Address applications.
Unlike most 100 V amplifiers, PA 4-250 does not use output transformers, w ic allows to power t e speakers
wit a ig quality signal. In addition, Class-H tec nology brings a gain weig t and space w ile offering ig -
yield performances. One of t e main applications of t e PA 4-250 is t e amplification of independent zones
using low impedance outputs for near field and 100 V line for long distance speakers. T e device concentrates
all t e settings on t e rear panel and control leds on t e front panel; it allows full monitoring of t e amplifier
status.
•4 x 250 W
•4 Ω, 70 V or 100 V outputs
•Class-H amplification
•No output transformers
•2 operating modes MONO or DUAL
•Signal presence indicators
•Workload indicators 4 Ω, 70 V and 100 V
•Protection indicators
•Band pass filter
•Balanced XLR inputs,
•Output screw terminals
•Two unit rack mount (2U)
•9.8 kg

4
1, 6, 11, 16 - SIG
Individual signal indicator. T e intensity of t e LEDs varies depending on t e level of t e input signal.
2, 7, 12, 17 - 4 Ω
Individual 4 Ω output indicator. See paragrap (29), (32), (37), (40).
3, 8, 13, 18 - 70V
Individual 70 V output indicator. See paragrap (29), (32), (37), (40).
4, 9, 14, 19 - 100V
Individual 100 V output indicator. See paragrap (29), (32), (37), (40).
5, 10, 15, 20 - PRO
Individual protection indicator.
PA 4-250 is equipped wit a safety start function, muting t e amplifier for a few seconds after t e power is
switc ed on. T is delay is visible t roug t e Led w ic lig ts up t en s uts off as soon as t e amplifier
becomes operational.
If t e led of one or more c annels stays on after few seconds or if it illuminates during normal using of t e
amplifier, it means t at a problem as been detected. T e c annel concerned intersecting automatically to
protect amplification circuits and equipment connected to t e device.
11 - POWER
Turn On / Off
Front Panel
Controls and Settings
3
PA 4-250
21
1 3 5
2 4
6 8 10
7 9
11 13 15
12 14
16 18 20
17 19

22, 23, 26, 27 - INPUT
XLR balanced inputs.
24, 25, 34, 35 - OUTPUT
Speaker outputs on screw terminals. C eck t e tig tness of t e cables before use.
28, 33, 36, 41 - Levels
Adjust t e levels of t e input signals.
29, 32, 37, 40 – Output selector
Position 4 Ω allows t e use of standard speakers. Be careful, do not use loads less t an 4 Ω at risk of
damaging t e amplifier.
T e 70 V or 100 V position requires speakers equipped wit 70 V or 100 V line transformers and a parallel
connection.
For these two modes, the sum of the powers of the speakers must not exceed the nominal power of
the amplifier. For example, it will not be possible to use more t an 25 speakers 10 W on t e same c annel.
T e selector must be activated w en t e power is turned off and disconnected from t e speaker outputs.
30, 38 - MONO UAL
In t e case of a Mono signal for w ic two amplifier c annels are required, t e switc must be set in MONO
mode. T e signal of one of t e inputs is automatically send t e ot er, w ic avoids an additional wiring. For
example, for c annels 1 and 2 connect t e audio source to input 1, for c annels 3 and 4 connect t e source to
input 3. For standard use, meaning one signal per c annel, turn t e switc in DUAL position.
31, 39 - L/H
Switc ing on/off function of a band pass filter for 70 V or 100 V mode. T is filter allows to eliminate any um or
background noise and protects t e speakers.
42 – AC INPUT
Power outlet. Before any connections make sure t at t e power cable is not damaged. T e connection to t e
mains supply must ave an eart connection. T e mains voltage supplied must conform wit t e electrical
c aracteristics of t e appliance (see C apter 5).
Fonctions et réglages
5
3
Back Panel
2422 4223 25 26 27
28 29 30 31 3332 34 4140393836 3735

6
Installations Hints
4
Technical Specifications
5
In case of installation in cabinet or rack, ensure t e ventilation requirements. T e dept of t e unit is 425 mm.
T e dimensions in eig t is 2 units Rack (88 mm).
Do not position ig -gain audio equipment like preamplifiers or recorders just above or below t e amplifier.
Despite t e protections of t e radiation device, magnetic fields can induce um in unscreened ancillary
equipment.
Do not obstruct t e entrance and exits of air for t e cooling of t e amplifier. Any impediment to t e free
movement of air in t e amplifier may cause a failure not covered by t e warranty.
T e amplifier use in an environment w ere t e air is confined or polluted requires frequent internal cleaning.
Smoke and dust particles accumulated inside t e appliance can cause failures not covered by t e warranty.
T is cleaning s ould be done by qualified personnel.
Before any work on t e wiring, be sure to turn t e control knobs fully counterclockwise and turn off t e
amplifier.
Only use good quality speaker cables, uns ielded.
Use good quality audio cables, s ielded, for inputs. A balanced connection is recommended to keep a signal
wit out degradation.
RMS Power (per c annel 4 Ω) 250 W
Amplification Class-H
Outputs 4 Ω, 70 V, 100 V
TH 0.1 % (1 kHz/-3 dBv)
S/N > 95 dB
Modes DUAL / MONO
Crosstalk > 60 dB
Input Level (balanced, 1 kHz) 0 ± 1.5 dBv
Input Level max. (balanced, 1 kHz) 20 dBv ± 1.5 dBv
(L/H Filter OUT) 20 Hz – 20kHz ± 1 dB
(L/H Filter IN) 200 Hz – 10 kHz ± 1 dB
Input Connectors XLR balanced
Ouptut connectors Screw terminals
Power Supply ~ 115-230 V, 50/60 Hz
imensions (L x x H) 483 x 425 x 88.5 mm
Net Weight 9.8 kg
Frequency Response

7
Malfunctions
Warranty
7
22, rue Édouard Buffard, Z.A.C. de la C arbonnière, Montévrain - 77771 Marne-la-Vallée Cedex 4 - France
Tél : + 33 (0)1 60 54 32 00 - Fax : + 33 (0) 1 60 54 31 90 - www.audiopole-pa.fr
6
T is device is warranted parts and labor against any manufacturing defects for a period of two years from t e
date of purc ase by t e first user.
Conditions
1. T e unit as been installed and implemented by observing t e safety instructions in t is operating manual.
2. T e device was not diverted from its destination, eit er voluntary or accidental, and suffered no
deterioration or modification ot er t an t ose described ere or explicitly aut orized by AUDIOPOLE.
3. All modifications or repairs ave been carried out by an aut orized service station.
4. T e defective product must be returned wit t e dealer w o made t e sale or to an aut orized service
station wit proof of purc ase.
5. T e device was properly packaged to avoid damage in transport.
Symptom Cause Solution
No power •T e mains cable is not correctly connected or is
faulty.
•T e power switc is not pressed.
•Reconnect t e power cord.
•C ange t e cord.
•Turn t e switc ON.
No sound on one or more
c annels •T e volume is at a minimum. •Speakers are not connected.
•One or more input signals are not connected or
t eir level is at zero.
•T e MONO / DUAL switc is positioned
improperly.
•T e PRO indicator is on.
•Adjust t e volume.
•Connect speakers.
•Connect inputs and adjust t e
levels of t e ot er equipment.
•Modify selection.
•C eck HP lines and connections
polarity
Saturated sound Inappropriate input signal level. Adjust levels and gains and t e
equalization of t e ot er equipment.
Hum Bad ground or faulty power supply. C eck t e mains voltage.
Noise 70 V and 100 V lines HP cables too close from equipment radiating (neon,
lig ting power supply).
Keep t e cables far from radiating
sources, engage t e L/H filter
Lack of bass and treble
ig power
Engaged L/H filter. Turn OFF t e L/H filter.
Some occasional problems are very often linked to andling errors. By c ecking t e points listed below, it will
be possible to find wit out difficulty, solutions to potential malfunctions. If problems persist, consult a dealer or
an aut orized AUDIOPOLE service center.