Yamaha Audio PC9500N, PC4800N User Manual

POWER AMPLIFIER

Owner’s Manual

E

FCC INFORMATION (U.S.A.)

1. IMPORTANT NOTICE: DO NOT MODIFY THIS UNIT! This product, when installed as indicated in the instructions contained in this manual, meets FCC
requirements. Modifications not expressly approved by Yamaha may void your authority, granted by the FCC, to use the product.

2. IMPORTANT: When connecting this product to accessories and/or another product use only high quality shielded cables. Cable/s supplied with this product MUST
be used. Follow all installation instructions. Failure to follow instructions could void your FCC authorization to use this product in the USA.

3. NOTE: This product has been tested and found to comply with the requirements listed in FCC Regulations, Part 15 for Class “B” digital devices. Compliance with
these requirements provides a reasonable level of assurance that your use of this product in a residential environment will not result in harmful interference with
other electronic devices. This equipment generates/uses radio frequencies and, if not installed and used according to the instructions found in the users manual, may
cause interference harmful to the operation of other electronic devices. Compliance with FCC regulations does not guarantee that interference will not occur in all
installations. If this product is found to be the source of interference, which can be determined by turning the unit “OFF” and “ON”, please try to eliminate the
problem by using one of the following measures: Relocate either this product or the device that is being affected by the interference. Utilize power outlets that are on
different branch (circuit breaker or fuse) circuits or install AC line filter/s. In the case of radio or TV interference, relocate/reorient the antenna. If the antenna lead-in
is 300 ohm ribbon lead, change the lead-in to coaxial type cable. If these corrective measures do not produce satisfactory results, please contact the local retailer
authorized to distribute this type of product. If you can not locate the appropriate retailer, please contact Yamaha Corporation of America, Electronic Service
Division, 6600 Orangethorpe Ave, Buena Park, CA 90620

The above statements apply ONLY to those products distributed by Yamaha Corporation of America or its subsidiaries.

• Explanation of Graphical Symbols

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

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.

The above warning is located on the
top of the unit.

WARNING: THIS APPARATUS MUST BE EARTHED

IMPORTANT

THE WIRES IN THIS MAINS LEAD ARE COLOURED IN
ACCORDANCE WITH THE FOLLOWING CODE:

GREEN-AND-YELLOW : EARTH
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 GREEN and YELLOW must be
connected to the terminal in the plug which is marked by the letter E
or by the safety earth symbol or coloured GREEN and YELLOW.

The wire which is coloured BLUE must be connected to the terminal
which is marked with the letter N or coloured BLACK.

The wire which is coloured BROWN must be connected to the
terminal which is marked with the letter L or coloured RED.

* This applies only to products distributed by YAMAHA KEMBLE

MUSIC (U.K.) LTD.

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 accompanying the product.

European Specifications Only

This mark indicates a dangerous electrically live terminal.
When connecting an external wire to this terminal, it is
necessary either to have “a person who have received
appropriate guidance on handling” make the connection or to
use leads or a cord that have been manufactured in such a way

that the connection can be made simply and without problem.

2

Precautions

WARNING

Installation

• 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.

• Use only the included power cord for this unit. Using other
types may be a fire and electrical shock hazard.

Operation

• 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.

In case an abnormality occurs during operation

• 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.

3

CAUTION

Installation

• 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.

• 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 rear to prevent the
internal temperature rising too high. Do not block them.
Blocked ventilation holes are a fire hazard.

• 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.

• 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.
For normal ventilation during use, remove the rear of the rack
or open a ventilation hole.
If the airflow is not adequate, the unit will heat up inside and
may cause a fire.

• To mount several of these units in an EIA-compliant rack,
refer to the rack mounting instructions on page 10.

Operation

• Use only speaker cables when connecting speakers to
amplifier outputs. Using other types of cables is a fire hazard.

• Do not use this amplifier for any purpose other than driving
loudspeakers.

PRECAUTIONS FOR OPERATION – FOR CORRECT OPERATION –

Connector pin assignments

• XLR-type connectors are wired as follows: pin 1: ground, pin
2: hot (+), and pin 3: cold (–).

4

Influence on cell phone usage

• Using a cell phone (mobile telephone) near this unit may
induce noise. If noise occurs, use the telephone away from the
unit.

Introduction

Thank you for purchasing a Yamaha PC9500N, or PC4800N Series Power Amplifier.
The PC Series of power amplifiers was developed from Yamaha’s wealth of experience in building

PA equipment and its tradition of careful attention to every detail of circuit design. These power
amplifiers feature high power and superb quality together with superior reliability and stability,
guaranteeing the highest possible audio performance.

Main features include

• Three modes are provided to support a broad range of applications: STEREO mode which
can be driven by two independent sources, PARALLEL mode in which a monaural source
drives both channels, and BRIDGE mode in which the two internal amps function as a single
mono amp.

• Balanced XLR connector and Euroblock connector inputs, and Speakon connector and five­way binding post outputs are provided.

•A high pass filter switch that cuts frequencies below 40 Hz, and detented attenuators and
level meters for channels A and B are provided.

• Metering and indicators include easily visible two-channel level meters, a PROTECTION
indicator that shows the state of various protection systems (power on/off detection, output
protection, DC detection), a TEMP indicator that indicates heat sink overheating, and a
REMOTE indicator that indicates the external remote status.

• Variable-speed, low-noise cooling fan system ensures high reliability even under the most
demanding conditions.

This Owner’s Manual applies to the PC9500N and PC4800N power amplifier. In order to take
full advantage of your power amplifier and enjoy long and trouble-free operation, please read this
Owner’s Manual carefully before using your Power Amplifier.

Contents

Introduction ...............................................................5

Controls and Functions ............................................. 6

Front Panel ..........................................................6

Rear Panel...........................................................7

Speaker connections ........................................... 8

Connection ................................................................9

Using a Euroblock connector............................... 9

Speaker Connection ............................................ 9

Air Flow ................................................................... 10

Rack Mounting ........................................................ 10

Specifications ..........................................................11

General Specifications....................................... 11

Block Diagram ................................................... 12

Dimensions ........................................................ 13

Troubleshooting ...................................................... 14

Performance graph ................................................. 14

5

Controls and Functions

■ Front Panel

234

1 8

1 POWER/STAND-BY switch and indicator

This turns the power of the amplifier on/off. When
you press the switch to turn on the power, the indica­tor will light green.
If the amplifier is connected to an external control
unit and the amplifier has been commanded to enter
STAND-BY mode, this indicator will light orange.

2 REMOTE indicator

This indicator will light green if the amplifier is being
controlled from an external device connected to the
DATA port located on the rear panel.

3 PROTECTION indicator

This indicator lights up red when the protection circuit
is operating. During this time, the amp will be
disconnected from the speaker system, and no sound
will be output from the speaker.
The protection system activates in the following
situations:

• When the amplifier is turned on

The protection system activates for approximately ten
seconds when the amplifier is turned on. After ten
seconds, the protection system deactivates automati­cally and the amplifier is ready for normal operation.

• If a DC voltage is detected at the amplifier’s
outputs

Turn off the power, and then turn the power back on
again.

• If the amplifier overheats

When this occurs, the TEMP indicator will be lit.
You should turn off the amplifier and allow it time to
cool down. See the Precautions section of this
Owner’s Manual for ways to prevent the amplifier
overheating.

5 776

4 TEMP indicator

This indicator will light red if the heat sink tempera­ture exceeds 85 degrees Celsius.

5 Level meters

These are nine-segment level meters that indicate the
output level of output jacks A and B. If the distortion
of the output signal exceeds 1%, the red CLIP
indicator will light.

6 Volume knobs

These are detented volume knobs that attenuate the
input signals of channels A and B over a range of –∞
– 0 dB.

In BRIDGE mode, only the channel A knob is used.

7 Air intakes

The amplifier has a forced-air cooling fan that takes in
air from the front and exhausts it from the rear. You
must make sure that these intakes are not obstructed.

8 Security cover

If you want to keep the volume settings from being
modified, attach the included security cover using the
screw holes shown below, so that the volume controls
are inaccessible.

6

■ Rear Panel

56 8 9

4172 3

1 XLR inputs

These balanced XLR-3-31 type connectors are used to
connect input signals. They are wired pin 1–ground,
pin 2–hot (+), and pin 3–cold (–).

GroundHot

1

2

3

Cold

In Bridge mode, only the XLR input of the channel A
is active.

2 MODE switch

• STEREO mode

Channels A and B will operate independently.

• PARALLEL mode

In PARALLEL mode, the channel A input signal will
be sent to the channel A power amp and to the
channel B power amp. The channel B input jack is not
used.

• BRIDGE mode

In BRIDGE mode, channels A and B will operate
simultaneously, functioning as a single mono amp.

5 DATA ports

An external control unit or interface box can be
connected here to monitor or control the amplifier
from the external device.

6 AMP ID switch

When an external control unit is connected to the
DATA port 5, this DIP switch is used to set the
system ID.

7 Euroblock connector

This is a balanced input jack. The included Euroblock
connector can be used to make connections here.

8 AC inlet

Connect the socket of the included AC cable to this
inlet. Connect the plug of the AC cable to an AC
outlet that meets the power supply conditions printed
below this inlet.

9 GND terminals

This is the grounding screw terminal. If hum or noise
occurs, ground (earth) the unit via this jack, or try
connecting it to the chassis of the mixer or preamp,
etc.

3 HPF 40 switches

These switches are used to turn on and off the HPF
(High Pass Filter) for each channel. When set to ON,
frequencies below 40 Hz are filtered using a 12 dB/
octave high pass filter.

4 SPEAKERS jacks

• These are Speakon type output jacks. Speakon type
cable plugs can be connected here.

• These are five-way binding post output jacks.

7

■ Speaker connections

Speakers can be connected to this amplifier in the following two ways. The speaker impedance will depend on the
connection method and on the number of speakers that are connected. Refer to the following diagrams, and make sure
that the speaker impedance is not less than the value prescribed for each type of connection.

Connections in STEREO/PARALLEL modes

or

+

–

Speaker

min. 4Ω

+

–

Speaker

min. 4Ω

Connections in BRIDGE mode

+

–

Speaker

min. 8Ω

When using the Speakon connector

Speaker

min. 8Ω

* Use the 1+(+) and 2+(–) pins of the 2 jack.

8

Connection

■ Using a Euroblock connector

1. If the wire insertion ports are closed, turn the screws
on top of the connector counterclockwise to open the
ports.

2. Insert the wires into the appropriate ports, following
the indication of the pole on the input terminal, turn
the screws on top of the connector clockwise to fix the
wires.

3. Attach the Euroblock connector to the input terminal
on the unit.

Use a screwdriver
to fix the wires.

G

–

+

■ Speaker Connection

Five-way binding post

1. Turn off the POWER switch.

2. Remove the cover attachment screws and remove the
protective cover from the speaker terminals.

Screw

3. After removing approx. 15 mm of insulation from the
ends of the speaker cables, pass the bare ends of the
speaker wires through the holes in the corresponding
speaker terminals and tighten the terminals to securely
clamp the wires. Refer to page 8 for speaker polarity.

15mm*

* Shown actual size.

At this time make sure that the bare ends of the
speaker cables do not extend from the terminals in
such a way that they touch the chassis.

Wire should not
touch the chassis.

4. Reattach the protective cover over the speaker
terminals.

Speakon type jack

1. Turn off the POWER switch.

2. Insert the Speakon plugs into the Speakon type jacks
on the rear of this amplifier, then turn them clockwise
to lock.

9

Air Flow

This unit uses a forced cooling system in which air comes in through the front opening and goes out the rear.

Air intake

Side View

Front

Air exhaust

Rear View

Rack Mounting

If multiple high-power amp units are mounted in a rack with poor ventilation, the heat from the amps will cause the
interior of the amp to become very hot, causing the performance of the amps to be impaired. In particular, when
mounting in a rack whose back can not be left open, mount according to the following instructions.

Rack: Leave a gap of 10 cm or more between the rear panel of the rack and the rear panel of the amplifier.
Fan: Use a fan with 1.5 m3/min or more maximum wind and 5 mmH2O or more maximum static pressure.
Mounting: Install the fan kit on the top slot or the top panel of the rack and install a blanking panel between two

amps.

If the unit is rack mounted and transported frequently, we recommend that the rear of the unit be supported by fitting
a pair of metal brackets, one each side.

Example of mounting

The figure on the left below shows an example of a fan kit (panels and two fans) on the top slot of the rack. The fans
are Minebia 3115PS-12T-B30 (with 0.9 m3/min maximum wind and 5 mmH2O maximum static pressure).
The figure on the right below is a dimensional diagram of a panel on which two 3115PS-12T-B30 are installed.

Fan kit

PC9500N/

PC4800N

PC9500N/

PC4800N

71.5±0.1

4-C15

78

78

71.5±0.1

4-ø4.5

248
463
480

4-6.5 x 11

76.2

Unit : mm

88

10

Specifications

■ General Specifications

PC9500N PC4800N

120 V (US)/ 240 V (A)

Power Output Level (Rated Power) 8Ω/STEREO 1000 W x 2 1050 W x 2 550 W x 2 500 W x 2

1 kHz 4Ω/STEREO 1600 W x 2 1650 W x 2 850 W x 2 800 W x 2
THD+N= 1% 8Ω/BRIDGE 3200 W x 1 3300 W x 1 1700 W x 1 1600 W x 1

8Ω/STEREO 925 W x 2 950 W x 2 475 W x 2 450 W x 2
20 Hz–20 kHz 4Ω/STEREO 1400 W x 2 1500 W x 2 725 W x 2 700 W x 2
THD+N= 0.1% 8Ω/BRIDGE 2800 W x 1 3000 W x 1 1450 W x 1 1400 W x 1

1 kHz 2Ω/STEREO 2300 W x 2 2300 W x 2 1200 W x 2 1200 W x 2
20mS nonclip 4Ω/BRIDGE 4600 W x 1 4600 W x 1 2400 W x 1 2400 W x 1

Power Bandwidth Half Power 10 Hz–40 kHz (THD+N= 0.5%)

Total Harmonic Distortion (THD + N)

20 Hz~20 kHz, Half Power

Frequency Response RL= 8Ω, Po= 1 W 0 dB, 0.5 dB, –1 dB f=20 Hz–50 kHz

Intermodulation distortion (IMD)

60 Hz:7 kHz, 4:1, Half Power

Channel Separation Half Power, RL= 8Ω, 1 kHz

Residual Noise Vol. min.

SN Ratio

Damping Factor RL=8Ω, f= 1 kHz ≥800

Sensitivity (Vol. max.) Rated Power into 8Ω +9 dB +6 dB

Voltage Gain (Vol. max.) 32 dB

Input Impedance 30 kΩ/Balanced, 15 kΩ/Unbalanced

Controls Front Panel POWER switch (ON/OFF)

Connectors Input XLR-3-31 type/ch

Indicators POWER/STAND-BY Green/Orange

Meters 10 points LED meter

Load protection POWER switch ON muting, DC detection

Amp. protection Temp. detection (heatsink temp ≥ 90°C), VI limiter (RL ≤ 1 Ω)

Limiter Comp. : THD ≥ 0.5%

Cooling Dual Variable-speed fan

Power Requirements US & Canada 120 V, 60 Hz

Power Consumption Idling 55 W 40 W

Dimensions (W x H x D) 480 x 88 x 456 mm

Weight 13 kg 12.5 kg

Accessories

Vol. max., input 600Ω shunt

20 Hz~20 kHz (DIN AUDIO)

20 Hz~20 kHz (DIN AUDIO)

Rear Panel MODE switch (STEREO/BRIDGE/PARALLEL)

Output SPEAKON /ch, 5-way binding posts

NETWORK RJ45 x 2

POWER AC INLET

PROTECTION Red

TEMP Red (heatsink temp ≥ 85°C)

REMOTE Green

Europe 230 V, 50/60 Hz

Other 240 V, 50/60 Hz

Output power, 4Ω 120 V 750 W 230 V 1100 W 120 V 450 W 230/240 V 600 W

≤0.1%

≤0.1%

≥70 dB

≤ –70 dB

Volume (31 position) /ch

HPFswitch (ON/OFF) fc=40 Hz 12dB/octave
DIP switch (6P)

Euroblock connector /ch

240 V 1000 W

Power cord, Security cover, Owner’s Manual, Euroblock connector (2)

0 dB=0.775 Vrms, Half Power=1/2 Power Output Level (Rated Power)
Specifications subject to change without notice.

For European Model
Purchaser/User information specified in EN55103-1 and EN55103-2.
Inrush Current: 20A (PC9500N) / 25A (PC4800N)
Conformed Environment: E1, E2, E3 and E4.

230 V (EU)

106 dB 103 dB

120 V (US)/ 240 V (A)

230 V (EU)

11

■ Block Diagram

12

■ Dimensions

26

380

456

25 30 370 30 25

480

4

46

88

Unit: mm

13

Troubleshooting

The following table lists the main causes of abnormal operation and the corrective measures required as well as the
protective circuit operation in each case.

Protection CircuitRemedyPossible CauseIndicator

There is a short at the

CLIP indicator lights up

amplifier’s speaker
outputs, the speaker’s
inputs, or in the wiring.

The impedance of the
connected speaker
is too low.

Locate and remove
the short.

Use a speaker with a
minimum impedance
of 4Ω (8Ω in Bridge
mode).

The PC limiter circuit
activates to protect
the power transistors.

The heat sink temperature

has exceeded 90°C.
PROTECTION indicator
lights up

A DC voltage of ±2 V

or greater was detected

in the amplifier’s output

circuit.

Performance graph

PC9500N

10000

1000

100

Check the ventilation
around the amplifier
and improve the airflow
if necessary.

Consult your dealer
or a Yamaha service
center.

Mode:STEREO
Both ch

Power Consumption[W]

The thermal protection
circuit activates to
protect the power
transistors.

The output relay activates
to protect the speaker
system.

10

Power consumption[W]Power consumption[W]

1

110100 1000 10000

PC4800N

10000

1000

100

10

1

110100 1000

14

Output Power[W]

Mode:STEREO
Both ch

Power Consumption[W]

Output Power[W]

V853450 R11 AP 16 Pro Audio & Digital Musical Instrument Division

NP Printed in Taiwan

YAMAHA CORPORATION

P.O. Box 3, Hamamatsu, 430-8651, Japan

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