Sony SRP-P450 Users guide

CONTENTS

2-347-074-11(1)

POWER AMPLIFIER

SRP-P450

Operating Instructions

Thank you for purchasing this Sony product. Please be sure
to read this manual before using this product. After reading,
keep the manual in a safe place for future reference.

Warning......................................

Main characteristics .................

Names and functions................

Block diagram ...........................

Dimensions................................

Putting ATT guard to the unit ..

Main specifications...................

Troubleshooting guide ............

2

3
4
6
7
7
8
9

 1999 by Sony Sound Tec Corporation

Warning

English

WARNING

To prevent fire or shock hazard, do not expose the unit to rain or
moisture.
To avoid electrical shock, do not open the cabinet. Refer servicing to
qualified personnel only.

• Operate the unit only on 230V AC, 50/60 Hz.

Notice for the Customers in the United Kingdom

IMPORTANT

The wires in this mains lead are coloured in accordance with the
following code:
Blue: Neutral
Brown: Live
As the colours of the wires in the mains lead of this apparatus may not
correspond with the coloured markings identifying the terminals in
your plug, proceed as follows:
The wire which is coloured blue must be connected to the terminal
which is coloured brown must be connected to the terminal which is
marked with the letter L or coloured red. Do not connect either wire
to the earth terminal in the plug which is marked by the letter E or by
the safety earth symbol Y or coloured green or green-and-yellow.

Français

AVERTISSEMENT

Afin d’éviter tout risque d’incendie ou d’électrocution, ne pas exposer
l’appareil à la pluie ou à l’humidité.
Afin d’écarter tout risque d’électrocution, garder le coffret fermé. Ne
confier l’entretien de l’appareil qu’à un personnel qualifié.

• Faites uniquement fonctionner cet appareil sur une tension de 230
V CA, 50/60 Hz.

Svenska

VARNING

Utsätt inte apparaten för regn och fukt för att undvika riskerna för
brand och/eller elektriska stötar.
Öppna inte höljet. Det kan resultera i risk för elektriska stötar. Överlåt
allt reparations- och underhållsarbete till fackkunniga tekniker.

• Du kan endast driva apparaten med 230 V växelström, 50/60 Hz.

Italiano

ATTENZIONE

Per evitare il pericolo di incendi o scosse elettriche, l’apparecchio non
deve essere esposto alla pioggia o all’umidià.
Per evitare scosse elettriche, non aprire l’apparecchio. Per le
riparazioni rivolgersi solo a personale qualificato.

• Far funzionare l’apparecchio con corrente alternata a 230 V, 50/60
Hz.

Norsk

ADVARSEL

For å hindre brann og støtfare må enhetens overflate ikke utsettes for
regn eller fuktighet.
For å unngå elektrisk støt må kassen ikke åpnes. Service må bare
utføres av kvalifisert personell.

• Enheten må bare betjenes ved 230 V vekselstrøm, 50/60 Hz.

Suomi

VAROITUS

Español

ADVERTENCIA

Para evitar incendios o el riesgo de electrocución, no exponga la
unidad a la lluvia ni a la humedad.
Para evitar descargas eléctricas, no abra la caja. En caso de avería
solicite los servicios de personal cualificado solamente.

• Alímente la unídad sólo con 230 V CA, 50/60 Hz.

Deutsch

VORSICHT

Um die Feuergefahr und die Gefahr eines elektrischen Schlages zu
vermeiden, darf das Gerät weder Regen noch Feuchtigkeit ausgesetzt
werden.
Um einen elektrischen Schlag zu vermeiden, darf das Gehäuse nicht
geöffnet werden. Überlassen Sie Wartungsarbeiten stets nur einem
Fachmann.

• Betreiben Sie das Gerät ausschließlich an 230 V Wechselspannung,
50/60 Hz.

Nederlands

WAARSCHUWING

Stel het apparaat niet bloot aan regen of vocht, om gevaar van brand
of een elektrische schok te voorkomen.
Open niet de behuizing, om gevaar van elektrische shokken te
vermijden. Laat reparatiles aan de erkende vakhandel over.

• Last dit toestel enkel werken op 230 V wisselstroom, 50/60 Hz.

2

Tulipalon ja iskuvaaran välttämiseksi ei laitetta saa altistaa sateelle ja
kosteudelle.
Sähköiskun välttämiseksi ei koteloa saa avata. Anna vain
asiantuntijan suorittaa huolto.

• Laite käyttää 230 V:n vaihtovirtaa, jonka taajuus on 50/60 Hz.

Dansk

ADVARSEL

For at undgå faren for brand eller elektrisk stød må udstyret ikke
udsættes for regn eller kraftig fugt.
Åbn ikke kabinettet, da der er risiko for elektriske stød. Overlad alle
reparationer til kvalificeret servicepersonale.

• Betjen kun enheden med 230 V veksetlstrøm, 50/60 Hz.

Português

ADVERTÊNCIA

Para evitar o risco de incêndio ou de choques eléctricos, não exponha
o aparelho à chuva nem à humidade.
Para evitar descargas eléctricas, não abra o aparelho. Peça assistência
somente a técnicos especializados.

• O apparelho só deve ser utilizado com corrente de 230 V CA, 50/60
Hz.

Table of contents

Precautions

For the customers in Europe

This product with the CE marking complies with both the
EMC Directive(89/336/EEC) and the Low Voltage Directive
(73/23/EEC) issued by the Commission of the European
Community.
Compliance with these directives implies conformity to the
following European standards:

•EN60065 :Product Safety

•EN55103-1:Electromagnetic Interference(Emission)

•EN55103-2:Electromagnetic Susceptibility(Immunity)
This product is intended for use in the following
Electromagnetic Environment(s):
E1(residential),E2(commercial and light industrial),E3
(urban outdoors) and E4(controlled EMC environment ex.
TV studio).

Peak inrush current

(1)Power ON,current probe method: 36A (240V)
(2)Hot switching inrush current, measured in
accordance with European
standard EN55103-1: 36A (230V)

Pour les clients européens

Ce produit portant la marque CE est conforme à la fols à la
Directive sur la compatibilité électromagnétique (EMC) (89/
336/CEE) et à la Directive sur les basses tensions (73/23/
CEE) émises par la Commission de la Communauté
européenne.
La conformité à ces directives implique la conformité aux
normes européennes suivantes:

•EN60065 :Sécurité des produits

•EN55103-1:Interférences électromagnétiques (émission)

•EN55103-2:Sensibilité électromagnétique (immunité)
Ce produit est prévu pour être utilisé dans les
environnements électromagnétiques suivants:
E1(résidentiel),E2(commercial et lndustrie légère),E3
(urbain extérieur) et E4(environnement EMC contrôlé ex.
studio de télévision).

Appel de courant de créte

(1)Mise sous tension (ON), méthode de sondago
du courant: 36A (240V)
(2)Mesuré conformément à la norme européenne
EN55103-1: 36A (230V)

On safety

• Should any liquid or solid object fall into the cabinet, unplug

the unit and have it checked by qualified personnel before
operating it any further.

• Unplug the unit from the wall outlet if it is not to be used for

an extended period of time. To disconnect the cord, pull it out
by grasping the plug. Never pull the cord itself.

On installation

• Do not install the unit in a location near heat sources such as

radiators or air ducts, or in a place subject to direct sunlight,
excessive dust, mechanical vibration or shock.

• When mounting the unit on the EIA 19-inch standard rack,

allow enough space of 1U or more above this unit for good
ventilation.

• Do not block fan intake or exhaust ports.

• Do not install the unit in a completely enclosed rack.

• Make certain that there is enough space around the rear of the

amplifier; the exhaust air must flow out without resistance.

On operation

• Before making program source connections, be sure to turn

the power switch off and unplug the unit.

• When the unit is not used, turn the power off to conserve

energy and to extend the useful life of your unit.

On cleaning the cabinet

Clean the cabinet, panel and controls with a soft cloth lightly
moistened with mild detergent solution. Do not use any type of
abrasive pad, scouring powder or solvent such as alcohol or
benzine.

On repacking

Do not throw away the carton and the packing material. It
makes an ideal container for transporting the unit.
When shipping the unit for repair work or to another location,
repack it as it was.

If you have any questions or problems concerning your unit,
consult your nearest Sony dealer.

Main characteristcs

Für Kunden in Europa

Dieses Produkt besitzt die CE-Kennzeichnung und erfüllt
sowohl die EMV-Direktive (89/336/EEC) als auch die
Dilevtive Niederspannung (73/23/EEC) der EG-Kommission.
Die Erfüllung dieser Direktiven bedeutet Konformität für die
folgenden Europäischen Normen:

•EN60065 :Produktsicherheit

•EN55103-1:Elektromagnetische Interferenz(Emission)

•EN55103-2:Elektromagnetische Empfindlichkeit(Immunität)
Dieses Produkt ist für den Einsatz unter folgenden
elektromagnetischen Bedingungen ausgelegt:
E1(Wohnbereich),E2(kommerzleller und in beschränktem
Maße industrieller Bereich),E3(Stadtbereich im Freien) und
E4(kontrollierter EMV-Bereich, z.B. Fernsehstudio).

Spitzenstrom

(1)Einschaltstrom, Stromsonde: 36A (240V)
(2)Gemossen in EN55103-1: 36A (230V)

High power output of 1.4kw (at bridged mono)

High power output of 1.4kw is realized by the large Troidal
Power Transformer of 2kVA and the efficient 2 speed cooling
system.
Capable of variable use for example as a theater system or a
wide room application.

Studio Quality

Excellent separation of back ground sounds and the words.
Forceful scenes can be reproduced effectively. It is possible
to use in a post production studio.

ATT guard is supplied

Supplied ATT guard raises reliance of the system after
adjusting the sounds.

Possible to mount 19 inches rack

3

Names and functions

Front panel

CHANNEL 1(MONO)

CHANNEL 2

1 CLIP indicator
2 ATTENUATOR control

3 Vents
4 OVER HEAT indicator

5 PROTECTION indicator
6 SIGNAL indicator

7 MONO indicator
8 POWER Switch and Pilot Lamp

1 CLIP indicator (red)

It lights up when output signals are distorted. In
this case, the input level is too high. Lower the
system GAIN by adjusting the ATTENUATOR
control 2.

2 ATTENUATOR control

From “0” (maximum) to “29” (–29dB down) in
1dB step.

CHANNEL 1 (MONO) position:
This control adjusts the level of channel 1 of this
unit. When the unit is used at monaural
operation by BTL, this control is to be used.

CH-2CH-1

25

20

ATTENUATOR CH-1

15

dB

10

CLIP

OVER HEAT

5

PROTECTION

SIGNAL

2CHANNEL POWER AMPLIFIER SRP-P450

MONO

POWER

CLIP

OVER HEAT

PROTECTION

ON

SIGNAL

25

20

ATTENUATOR CH-2

15

10

5

dB

∗ CHANNEL 1 and CHANNEL 2

equip with the same function.

5 PROTECTION (protection circuit) indicator

(red)

It lights up while the protection circuit is
operateing.
It also serves as the MUTING indicator at
POWER ON.

6 SIGNAL indicator

It lights up when signals are input to the
amplifier.
It does not lights when the ATTENUATOR control
is turned counterclockwise to the end (∞) or when the
fader of the mixer is turned down.

CHANNEL 2 position:
This control adjusts the input level of channel 2
of this unit. When the OPERATION switch is
set to MONO, this control does not function as it
is separated from the signal route.

3 Vents

There are vents of cooling fan in left and right
sides. If these vents are covered, such troubles
may happen that the cooling function does not
work correctly and the OVERHEAT indicator
lights up, or that the self restoration thermostat
equipped with power trans starts to work and
sounds will not able to be heard. Do not cover
these vents.

4 OVER HEAT (overheat warning) indicator

(red)

It lights up when the temperature of the inside
heat sink goes over the prearranged level.
Remove the cause such that the speaker
impedance is too low.

7 MONO (monaural) indicator (green)

It appears when the OPERATION switch on the
rear panel is set to MONO.

8 POWER switch and pilot lamp (green)

By pressing the upper part, the power is turned
on and the pilot lamp lights up.
By pressing the lower part, the power is turned
off.

Note

When the PROTECTION indicator lights up

In the cases as below, the protection circuit works and the
PROTECTION indicator lights up to protect the speakers or
the amplifier by cutting down the output power.

• When the connected speaker impedance is too low, or when
the output terminals short-circuits.

• When the temperature of the inside heat sink goes over the
prearranged level.
(The OVERHEAT indicator will continue being lit.)

• When direct current flows into the OUTPUT terminals by a
malfunction.

The PROTECTION of this unit is a self restoration type. If it
does not restore immediately, set the POWER switch to OFF,
remove the cause of trouble, then set the POWER switch to
ON again.

4

Rear panel

81

915

4 OUTPUT terminals
7 Monitor remote terminal

MONITOR/REMOTE

CH-2

OUTPUT

MONO

CH-2 CH-1

GND HOT COLD GND HOT COLD

OPERATION

STEREO MONO

STACKING

STACKING

INPUT

SPEAKER IMP.

STEREO MONO

4-16Ω 8-16Ω

GROUND LIFT

CH-1

(MONO)

6 GROUND LEFT switch

ǪÇÃëº

OTHERS

ǪÇÃëº

2 INPUT 2 terminal and STACKING terminal (CH2)

1 INPUT 1 (MONO) terminal and STACKING

terminal (CH1)

Connected to the outputs of a audio mixer.
Input signals are output directly to the
STACKING terminal.
When the OPERATION switch is set to MONO,
connect the monaural input signals here.

2 INPUT 2 terminal and STACKING terminal

(CH2)

Connected to the outputs of a mixer.
Input signals are output directly to the
STACKING terminal.
When the OPERATION switch is set to MONO,
this terminal is separated from the signal route.

Input connector
equivalent to XLR-3-12C

Push here to
remove

Put together

Stacking connector
equivalent to XLR-3-11C

Put together

Push here to
remove

21

3

1: GND
2: HOT
3: COLD

To avoid obstructing by radio frequency waves,
connect the earth terminal of XLR cable to
number 1 pin.

3 OPERATION switch

The operation mode switches as follows.

Position of OPERATION
switch

STEREO
MONO

Operation mode

2 channel operation
Bridged mono

1 INPUT 1 (MONO) terminal and STACKING terminal (CH1)

5 Barrier strip inputs
3 OPERATION switch

4 OUTPUT terminals

Used to connect to speakers. Connect the +
terminal of the speaker to the red terminal, and
the – terminal of the speaker to the black
terminal. In the case of monaural operation by
bridged mono, connect the + terminal of the
speaker to OUTPUT 1 red terminal, and the –
terminal of the speaker to OUTPUT 2 red
terminal.

5 Barrier strip inputs terminals

3P terminal is equipped on the upper side of the
XLR connector.
In the order from left, 1: GND 2: HOT 3:
COLD, the same as the canon connector.

6 GROUND LIFT (earth line switch) switch

In a large scale system, ham noise may be heard due
to a difference of GND potential generated between
system racks. In this case, ham noise may be
decreased by switching the GROUND LIFT switch
to separate the signal earth and the body earth.
In the case stated above, do not connect the
GND Pin of the XLR cable to the number 1 pin.

7 Monitor remote terminal

D-SUB 15 pin connector (female)
This terminal enables to monitor signals to be or
not, to monitor the protection circuit condition,
or to control muting function of this unit from
the outside.

Pin arrangement

Before changing the position of this switch, set
the POWER switch to OFF.

5

Names and functions (continued)

Monitor remote terminal

Specifications of input/output

Pin

1
2
3
4
5
6
7
8

9 to 15

*1

H level output for approximately 8 seconds at power ON of the main unit.

*2

Muting cancel in approximately 8 seconds after H level input.

Signal

SIG 1 OUT
SIG 2 OUT
GND
PROT 1 OUT
PROT 2 OUT
GND
MUTING 1 IN
MUTING 2 IN
Empty terminal

Signal explanation

Output for CH1 level meter
Output for CH2 level meter
Signal GNDPIN3
H level output at CH1 protection circuit operation
H level output at CH2 protection circuit operation

CH1 muting by L level input
CH2 muting by L level input

*2

*2

Block diagram

Signal specifications

0dBu output at 8Ω. 100W output.
Output IMP. approximately
2kΩ.

*1

5V TTL level output.
Output IMP approximately 10kΩ.

*1

Pull up at input 10kΩ, capable
of make Contact.

CH1

INPUT

GROUND LIFT

CH2

INPUT

231

231

ATT

THERMAL

CC

V

SENSOR

SENSOR

132

MONO

ATT

132

OPERATION

MONO

STEREO

SIGNAL

OVER
HEAT

SIGNAL

OVERTHERMAL
HEAT

CLIP

POWER

AMP

PROTECTION

CIRCUITS

CLIP

POWER

AMP

PROTECTION

CIRCUITS

CH1

OUTPUT

MONO+

PROTECTION

CH2

OUTPUT

MONO–

PROTECTION

6

Dimensions

3650

ǪÇÃëº

OTHERS

ǪÇÃëº

482

25

20

ATTENUATOR CH-1

15

dB

10

5

2CHANNEL POWER AMPLIFIER SRP-P450

CLIP

OVER HEAT

PROTECTION

SIGNAL

20

CLIP

OVER HEAT

MONO

25

PROTECTION

ON

SIGNAL

POWER

360

Note

The illustration of the unit is fit in the supplied feet.

CH-2CH-1
15

dB

ATTENUATOR CH-2

406

30054 (52)

140

10

5

132

Putting ATT guard to the unit

How to put in

There is a hole at the upper side, and two holes in the
bottom of the ATT guard.

Put the hole at the upper and the hole at the ATT guard
together, and push the bottom with a click.

7

Main specifications

Input circuit type Electronic balance circuit
Input connector XLR-3-31 type

3P terminal panel (1: GND, 2: HOT, 3: COLD)

Stacking terminal XLR-3-32 type
Speaker terminal Binding post
Rated output (1kHz THD 0.1%) 700W+700W (4Ω)

450W+450W (8Ω)
1400W (8Ω bridged mono)

Frequency characteristic 20Hz to 20kHz ±0.5dB
Damping factor More than 200 (8Ω, 1kHz)
Channel separation More than 70dB (at 8Ω, 1kHz 450W output)
High frequency distortion Less than 0.008% (at 8Ω, 1kHz 100W output)
Remaining noise voltage (IHF-A, input short-circuit) Less than 180µV, Less than 360µV (bridged mono)
Maximum amplification 34.5dB, 40.5dB (bridged mono)
Indicator SIGNAL indicator (green)

PROTECTION indicator (red)
OVER HEAT indicator (red)
CLIP indicator (red)
MONO indicator (green)
POWER indicator (green)

Power requirements AC 230V, 50/60Hz
Power consumption 1,200W
Power current 7.0A (at 4Ω 1/8 rated output)
Dimensions (w/h/d) 482 × 132 × 406mm

(excluding projecting parts and cotrols)

Net weight Approximately 26kg
Operation temperature 0˚C to 40˚C
Storage temperature –20˚C to 60˚C
Accessories Operating instructions (1)

Feet (4)
ATT guard (2)

0dBu=0.775V

8

Specifications and appearance are subject to change
without notice.

Troubleshooting guide

ǪÇÃëº

OTHERS

ǪÇÃëº

By pressing the POWER switch, lamp does not
light up and there is no sound.

Although the pilot lamp is lighting, there is no
sound.
(SIGNAL lamp does not light up either.)

The sound cannot be heard from the speakers.
(CLIP indicator, OVER HEAT indicator or
PROTECTION indicator lights up.)

When using Bi-AMP, LF signal goes to HF.

In operation of 2CH, low frequencies disappear.

The sound is noisy.

• Is the AC cord connected?

• Is the speakers connected correctly?

• Is the input selection of the mixer correct?

• The fader of the mixer is too low?

• Is there a short circuit in the speaker cord?

• Are the ventilation holes on front or rear covered?

• Do not use a closed rack for ventilation.

• Does CLIP indicator light up frequently?

• MONO STEREO switch on the unit is set to MONO?

• Is the conductors speaker cord connected correctly?

• Is the connected cord pole in correct direction?

• This is set to MONO?

• Are the connections of speaker terminals and
connection cords completed?

9

10

Printed in Japan