Yamaha NS-P270, NS-P276 User Manual

NS-P270/
NS-P276

(NS-P270 / NS-P276: NX-E270 + NX-C270 + SW-P270)

UB

OWNER’S MANUAL

i

IMPORTANT SAFETY INSTRUCTIONS

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.

• Explanation of graphic symbols:

The lightning flash with arrowhead
symbol within an equilateral triangle is
intended to alert you 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
you to the presence of important
operating and maintenance (servicing)
instructions in the literature
accompanying the appliance.

IMPORTANT

Please record the serial number of this system in the
space below.

Model:
Serial No.:
The serial number is located on the rear of the unit.

Retain this Owner’s Manual in a safe place for future
reference.

1

Read these instructions.

2

Retain these instructions.

3

Heed all warnings.

4

Follow all instructions.

5

Do not use this apparatus near water.

6

Clean only with a dry cloth.

7

Do not block ventilation openings. Install in accordance
with the manufacturer’s instructions.

8

Do not install near heat sources such as radiators,
heat registers, stoves, or other heat-producing
apparatus (including amplifiers).

9

Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades,
one wider than the other. A grounding type plug has
two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety. If
the provided plug does not fit into your outlet, consult
an electrician to replace the obsolete outlet.

10

Protect the power cord from being walked on or
pinched, particularly at plugs, convenience
receptacles, or the point at which the power cord exits
the apparatus.

11

Use only attachments/accessories specified by the
manufacturer.

12

Use only with a cart, stand, tripod,
bracket, or table specified by the
manufacturer, or sold with the
apparatus. When a cart is used, use
caution when moving the cart/
apparatus combination to avoid injury
from tip-over.

13

Unplug this apparatus during lightning storms or when
unused for long periods of time.

14

Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as if the 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.

•

Be sure to allow a space of at least 20 cm above,
behind and on both sides of SW-P270.

•

Do not place the following objects on SW-P270:
A vessel containing liquid.
If the vessel falls due to vibration and the liquid spills,
the unit may be damaged, and/or you may receive an
electric shock.

i

FCC INFORMATION (for US customers)

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:

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:

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 or uses radio
frequencies and, if not installed and used in
accordance with the instructions in the user’s
manual, may cause interference harmful to the
operation of other electronic devices.

When connecting this product to

This product has been tested and found to

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 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
circuits (circuit breaker or fuse) or install AC line
filter(s).

• In the case of radio or TV interference, relocate or
reorient the antenna. If the antenna lead-in is 300 ohm
ribbon lead, change the lead-in to a coaxial type cable.

If these corrective measures do not produce satisfactory
results, please contact the local retailer authorized to
distribute this product. If you cannot locate the
appropriate retailer, please contact YAMAHA
Electronics Corp., U.S.A.; 6660 Orangethorpe Ave;
Buena Park, CA 90620.

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

For U.K. customers

If the socket outlets in the home are not suitable for the plug
supplied with this appliance, the plug should be cut off and
an appropriate 3 pin plug fitted. For details, refer to the
instructions described below.

Note:

The plug severed from the mains lead must be
destroyed, as a plug with bared flexible cord is hazardous if
engaged in a live socket outlet.

We Want You Listening for a Lifetime

YAMAHA and the Electronic Industries Association’s
Consumer Electronics Group want you to get the most
enjoyment out of your equipment by playing it at a safe
level — a level that lets the sound come through loud and
clear without annoying blaring or distortion — and, most
importantly, without damaging your sensitive hearing.

Special Instructions for U.K. Model

IMPORTANT:

THE WIRES IN 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 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.
Making sure that neither core is connected to the earth
terminal of the three pin plug.

Since hearing damage from loud sounds
is often undetectable until it is too late,
YAMAHA and the Electronic Industries
Association’s Consumer Electronics
Group recommend that you avoid pro­longed exposure to excessive volume
levels.

ii

Precautions

1To assure the finest performance, please read this manual

carefully. Keep it in a safe place for future reference.

2 Install the speakers in a cool, dry, clean place – away from

windows, sources of heat, sources of excessive vibration, dust,
moisture or cold. Avoid sources of electrical humming (e.g.,
transformers and motors). To prevent fire or electric shock, do
not expose the speakers to rain or water.

3To prevent the enclosure from warping or discoloring, do not

expose the speakers to direct sunlight or excessive humidity.

4Avoid installing the speakers where foreign objects may fall

onto them and/or where they may be exposed to liquid
dripping or splashing.

5 Do not place the following objects on top of the speakers:

- Other components, as they might damage or discolor the
surface of the speakers;

- Burning objects (e.g., candles), as they might cause fire,
damage to the speakers or personal injury;

- Containers of liquid, as they might spill and cause electric
shock to the user or damage to the speakers.

6 Do not place the speakers where they are liable to be knocked

over or struck by falling objects. Stable placement will also
ensure better sound performance.

7 Placing the speakers on the same shelf or rack as the turntable

can result in feedback.

8 Secure placement or installation is the owner’s responsibility.

YAMAHA is not liable for accidents caused by improper
placement or installation of speakers.

9Any time you note distortion, reduce the volume control on

your amplifier to lower setting. Never allow your amplifier to
be driven into “clipping”. Otherwise, the speakers may be
damaged.

10 When using an amplifier with a rated output power higher

than the nominal input power of the speakers, care should be
taken not to exceed the speakers’ maximum input.

11 Do not attempt to clean the speakers with chemical solvents as

this might damage the finish. Use a clean, dry cloth.

12 Do not attempt to modify or fix the speakers. Contact

qualified YAMAHA service personnel when service is
needed. The cabinet should never ve opened for any reason.

13 Be sure to read the “Troubleshooting” section regarding

common operating errors before concluding that the speakers
are faulty.

This unit features a magnetically shielded design, but there
is still a chance that placing it too close to a TV set might
impair picture color. Should this happen, move this unit
away from the TV set.

For the SW-P270

1 Do not operate this unit upside down. It may overheat,

possibly causing damage.

2 Do not use excessive force on switches, controls or

connection wires. When moving this unit, first disconnect the
power plug and the wires connected to other equipment.
Never pull the wires themselves.

3 Since this unit has a built-in power amplifier, heat radiates

from the rear panel. Place the unit away from walls, allowing
at least 20 cm of space above, behind and on both sides of the
unit to prevent fire or damage. Furthermore, do not position
the unit with the rear panel facing down on the floor or other
surfaces.

4 When using a humidifier, be sure to avoid condensation inside

this unit by allowing enough space around the unit and
avoiding excess humidification. Condensation might cause
fire, damage to the unit, or electric shock.

5 Do not cover the rear panel of this unit with a newspaper,

tablecloth, curtain, etc. to avoid obstructing heat radiation. If
the temperature inside the unit rises, it may cause fire, damage
to the unit, or personal injury.

6 Do not plug this unit into a wall outlet until all connections are

complete.

7 The voltage to be used must match that specified on the rear

panel. Using this unit with a voltage higher than specified is
dangerous and may cause fire, damage to the unit, or personal
injury. YAMAHA is not responsible for damage resulting
from use of this unit with a voltage other than specified.

8 Super-bass frequencies reproduced by this unit may cause a

turntable to generate audio feedback. In this case, move the
unit away from the turntable.

9 This unit may be damaged if certain sounds are continuously

output at high volume level. For example, if 20 Hz–50 Hz sine
waves from a test disc or bass sounds from an electronic
instrument, etc. are continuously output, or if a turntable
stylus touches the surface of a disc, reduce the volume level to
prevent the unit from being damaged.

10 If you hear distorted noise (i.e., unnatural, intermittent

“rapping” or “hammering” sounds) from this unit, reduce the
volume level. Extremely loud movie soundtrack low
frequency, bass-heavy sounds, or similarly loud popular music
passages can damage the speaker system.

11 Vibration generated by super-bass frequencies may distort

images on a TV. In this case, move the unit away from the TV
set.

12 When disconnecting the power cord from the wall outlet,

grasp the plug; do not pull the cord.

13 When you plan not to use this unit for a long period of time

(i.e., vacation, etc.) disconnect the AC power plug from the
wall outlet.

14 Install this unit near the wall outlet and where the AC power

plug can be reached easily.

WARNING

TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS UNIT TO RAIN OR
MOISTURE.

For Canadian Customers

To prevent electric shock, match wide blade of plug to wide
slot and fully insert.
This Class B digital apparatus complies with Canadian
ICES-003.

As long as this unit is connected to the AC wall outlet, it is
not disconnected from the AC power source even if you turn
off this unit by POWER.

iii

•VOLTAGE SELECTOR
(For China, Korea, Asia and General models)
The voltage selector switch on the rear panel of this unit must be set for your local main voltage BEFORE
plugging this unit into the AC main supply. Voltages are 110-120/220-240 V AC, 50/60 Hz.

Table of contents

Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Package contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Setting up the speakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Positioning the front and surround speakers (NX-E270) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Positioning the center speaker (NX-C270). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Positioning the subwoofer (SW-P270) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Mounting the front and surround speakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Basic connection example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Connecting speaker cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Connecting components and the subwoofer to AC power . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Using the subwoofer (SW-P270) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Pre-adjusting the subwoofer volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Advanced YAMAHA Active Servo Technology (on the SW-P270). . . . . . . . . 9

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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

Frequency characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1

Introduction

Thank you for choosing a YAMAHA NS-P270 or NS-P276 Home Cinema 5.1/6.1 Channel Speaker System.
Each of these systems includes the following speakers:

• NX-E270

The NX-E270 are full-range acoustic-suspension speakers. Each system includes two (2) front and two
(2) surround speakers. In addition, the NS-P276 system includes an additional NX-E270 that serves as a
surround back speaker.

• NX-C270

The NX-C270 is a full-range acoustic-suspension center speaker.

•SW-P270

The SW-P270 is a subwoofer that features a built-in power amplifier. It utilizes Advanced YAMAHA
Active Servo Technology to reproduce extremely high quality super-bass range sounds that add a rich,
realistic dimension to your home theater. (Refer to page 9 for detailed information on Advanced
YA MAHA Active Servo Technology.)

Package contents

Please confirm that the following items are included in the package.

Front and surround speakers
(and surround back speaker in NS-P276)

NX-E270

X 4 <NS-P270>
X 5 <NS-P276>

Center speaker

NX-C270

Subwoofer

SW-P270

Speaker cables

[4 m]

X 3

Subwoofer cable Fasteners

Non-skid pads
[1 set, 8 pcs]
(for NX-E270)

X2 <NS-P270>
X3 <NS-P276>

[10 m]

(for NX-C270)

Non-skid pads
[1 set, 4 pcs]
(for SW-P270)

X 2 <NS-P270>
X 3 <NS-P276>

X 2

2

Setting up the speakers

Before you connect the speakers, place each
speaker in its respective location. Speaker
positioning is very important as it affects the
overall sound quality of the system. Place the
speakers in locations that will optimize the sound
quality at your listening position. Refer to the
illustration below.

The position of the subwoofer is not as critical as
the position of the other speakers because low bass
tones are not highly directional. Refer to
“Positioning the subwoofer (SW-P270)” on page 4
for more information.

Note:

These speakers are magnetically shielded.
However, if you place them too close to a TV, they
may impair picture color. In this case, move the
speakers further away from the TV.

Front R

TV-set

Front L

Subwoofer

Surround R

Center

Surround back
(for NS-P276)

Surround L

Positioning the front and surround speakers (NX-E270)

Non-skid pad

Front speakers:

the left and right sides of the TV, at approximately
the same height as the TV, facing directly forward.

Surround speakers:

surround speakers behind your listening position,
facing slightly inward, about 1.8 m (approx. 6 feet)
above the floor.

Surround back speaker (for NS-P276
systems only):

speaker behind your listening position, precisely
between the surround speakers, about 1.8 m
(approx. 6 feet) above the floor.

You can set the front, surround, and surround back
speakers on tables or other supports, or mount
them on a wall or speaker stand. (For more
information, see “Mounting the front and surround
speakers” on page 5.)

Place the two front speakers on

Place the left and right

Position the surround back

Non-skid pads:

flat surface, attach the included non-skid pads to
the corners of the speaker bottoms, as shown
above. The non-skid pads will prevent the speakers
from sliding.

When placing the speakers on a

3

Positioning the center speaker

Positioning the subwoofer

(NX-C270)

Place the center speaker precisely between the
front speakers, facing directly forward. You can
place the center speaker on top of a TV (if the top
of the TV is flat), on the floor beneath the TV, or in
an entertainment center. Be sure to place the
speaker in a stable location.

When placing the speaker on top of a TV rack, etc.,
to prevent the speaker from falling, attach the
provided fasteners at two points on the bottom of
the speaker and on top of the TV, as illustrated
below.

Peel off
the
seal.

(SW-P270)

It is recommended to place it on the outside of
either the right or the left front speaker. (See fig. A.)
The placement shown in fig. B is also possible,
however, if the subwoofer system is placed directly
facing the wall, the bass effect may lessen because
the sound from it and the sound reflected by the wall
may cancel out each other. To prevent this from
happening, face the subwoofer system at an angle as

A.

in fig.

Note:

There may be a case that you cannot obtain enough
super-bass sounds from the subwoofer when
listening in the center of the room. This is because
"standing waves" have been developed between
two parallel walls and they cancel the bass sounds.
In such a case, face the subwoofer obliquely to the
wall. It also may be necessary to break up the
parallel surfaces by placing bookshelves etc. along
the walls.

AB

Cautions:

• Do not place the center speaker on a TV that has a top

surface area smaller than the speaker bottom.
Otherwise, the speaker may fall and cause injury.

• Do not place the center speaker on a TV that has a

slanted or inclined top.

• Do not touch the adhesive surface of a fastener after

you peel off the seal, as this will weaken the adhesive
strength of the fastener.

• Thoroughly wipe to clean the surface where the

fastener is to be applied. Note that adhesive strength
will be weakened if the surface is dirty, oily or wet.
Weakened adhesive may cause the center speaker to
fall.

4

: Subwoofer : Front speaker

Non-skid pads:

pads at the four corners of the bottom of the
subwoofer to prevent the subwoofer from sliding
due to vibration or minor impact.

Place the included non-skid

Mounting the front and surround speakers

You can place the front and surround speakers (and
surround back speaker in an NS-P276 system) on a
shelf or rack, set them on the floor, or mount them
on a wall or speaker stand.

Installing the speakers on commercially
available speaker stands:

You can mount the front, surround, and surround
back speakers on a speaker stand. When you
installing the speaker on commercially available
speaker stand, you need to attach a bracket to the
bottom of the speaker using a screw.

To mount the speakers on a wall:

Affix screws to a firm wall or wall support as

1.

shown below. (Use tapping screws 3.5 to 4mm
in diameter.)

Wall/ wall

support

70 mm

Minimum

20 mm

2.

Suspend the speaker by mounting the holes in

Holes

10 mm

the speaker’s rear panels on the protruding
screws.

Rear view

70 mm

60 mm (2-3/8”)

Bracket (AAX34790)
(option)

M4 screw (AAX12390)
(option)

Insert only M4
screws through
the outside holes.

70 mm

Note: Make sure that the
screws are securely affixed in
the narrow part of the holes.

Cautions

• Each front or surround speaker weighs 0.8 kg

(1.8 lbs.). Do not mount the speakers on thin plywood
or on a wall made of soft surface material. Otherwise,
the screws may pull out of the surface and the speak­ers may fall, possibly damaging the speakers or caus­ing personal injury.

• Do not affix the speakers to a wall using nails, adhe-

sives, or unstable hardware. Long term use and vibra­tion may cause the speakers to fall.

•To avoid accidents resulting from tripping over loose

speaker cables, affix the cables to the wall.

• Mount the speakers in a wall location that will be

unlikely to result in injury to an individual’s head.

:

5

Connections

Caution: Plug the power cables for the subwoofer and other audio/video components into an AC
outlet only after you complete all other connections.

Basic connection example

Note: The rear panel
of various amplifiers
may differ in
appearance.

Amplifier

Front speakers

Right

Left

Surround speakers

Right

Left

6

Subwoofer

To AC outlet

Center speaker

Surround back speaker

(in NS-P276 systems)

Connecting speaker cables

Keep the speaker cables as short as possible. Do
not bundle or roll up excess cable. If the
connections are faulty, you will hear no sound
from the speakers.

Before connecting the cables:

Remove a small amount (about 10 mm) of
insulation coating from the end of each speaker
cable.

Good

One side of the included speaker cable is marked
with a broken white line; the other side is unlined.
Connect the (+) terminal on the speaker to the (+)
terminal on the amplifier using the cable side
marked with the broken white line. Connect the (–)
terminals on both components using the unlined
side of the speaker cable.

Not Good

Connections:

• Connect the front, center and surround speakers (and
surround back speaker for the NS-P276) to the
speaker output terminals on your amplifier using the
included speaker cables.
– The included speaker cables have labels marked

FRONT L, FRONT R, CENTER, REAR L, REAR
R (and REAR C for NS-P276). Connect each
speaker cable to the corresponding speaker as
illustrated in the figure on page 6.

– Connect each speaker making sure not to reverse

the polarity (+, –). If the speaker is connected with
reversed polarity, the sound will be unnatural and
lack bass.

–For the front and surround speakers only, connect

one speaker to the left (marked L) terminals on
your amplifier, and the other speaker to the right
(marked R) terminals.

• Connect the subwoofer to the line output (pin jack)
terminal(s) on the amplifier.
–To connect to a YAMAHA DSP amplifier (or AV

receiver), connect the SUBWOOFER (or LOW
PASS, etc.) terminal on the rear of the DSP
amplifier (or AV receiver) to the INPUT terminal
on the subwoofer.

Inserting the cables:

Press and hold the terminal tab, as shown in the

1.

figure below.

2.

Insert the bare wire core.
Release your finger from the tab to allow it to

3.

lock securely on the bare wire core.

4.

Test the security of the connection by pulling
gently on the cable at the terminal.

Black: negative (–)

1

3

Note:

Do not let uninsulated bare wires touch each
other as this could damage the speaker or the
amplifier.

Red: positive (+)

Note: Do not insert
the insulation coating
into the hole. The

2

sound may not be
produced.

Connecting components and the subwoofer to AC power

After you complete all speaker and subwoofer
connections, plug the amplifier, other audio/video
components, and the subwoofer into an AC outlet
of appropriate voltage. Make sure the subwoofer’s

VOLUME

adjust the speaker balance as described on page 8.

control is set to 0 before proceeding to

7

Using the subwoofer (SW-P270)

1

Pre-adjusting the subwoofer

Rear panel

2

VOLUME

3

INPUT

4

Power indicator

1

Lights up in GREEN when the
(4) is turned ON; turns off when the
switch is turned

2

VOLUME control

Adjusts the volume level. Turn the control
clockwise to increase the volume, and
counterclockwise to decrease the volume.

OFF

ON

POWER

OFF

POWER switch

.

POWER

volume

Before you use the subwoofer, first adjust the
volume balance between the subwoofer and the
front speakers by following the procedure below.

1.Set the VOLUME control to minimum (0).

2.Turn on the power to all other components.

3.Press the POWER switch to the ON position.

The power indicator on the rear panel lights up
in green.

4.Play a source that contains low-frequency

sounds. Adjust the amplifier’s volume control to
the desired listening level.

5.Rotate the VOLUME control gradually to adjust

the volume balance between the subwoofer and
the other speakers. In most cases, set the control
to a level at which you hear slightly more bass
than when the subwoofer is not used.

6.Adjust the volume of the entire sound system

using the amplifier’s volume control.

• If you replace the front speakers (NX-E270) with
other speakers, you must again balance the subwoofer
and surround speaker volume.

•For more information on adjusting the
control, refer to “Frequency characteristics” on
page 11.

VOLUME

INPUT terminal

3

Input terminal for line level signals from the
amplifier.

POWER switch

4

Press this switch to the ON position to turn on
the power to the subwoofer. When the power of
the subwoofer is on, the power indicator (1) on
the rear panel lights up green. Press this switch
again to set it to the
power of the subwoofer.

OFF

position to turn off the

8

Advanced YAMAHA Active Servo Technology (on the SW-P270)

The theory behind YAMAHA Active Servo
Technology is based on two factors: the Helmholtz
resonator and negative-impedance drive. Active
Servo Processing speakers reproduce the bass
frequencies through an “air woofer,” which is a
port or opening in the speaker’s cabinet.
This opening is used instead of, and performs the
functions of, a woofer in a conventionally designed
speaker system.

Thus, signals of low amplitude within the cabinet
can, according to Helmholtz resonance theory, be
output from this opening as waves of great
amplitude if the size of the opening and the volume
of the cabinet are in proportion to satisfy a certain
ratio. In order to accomplish this, moreover, the
amplitudes within the cabinet must be both precise
and of sufficient power because these amplitudes
must overcome the “load” presented by the air in
the cabinet.

This problem is resolved by a design in which the
amplifier supplies special signals. If the electrical
resistance of the voice coil could be reduced to
zero, the movement of the speaker unit would
become linear with respect to signal voltage. To
accomplish this, the system utilizes a special
negative-impedance output-drive amplifier that
subtracts the output impedance of the amplifier.

By employing negative-impedance drive circuits,
the amplifier is able to generate precise, low­amplitude, low frequency waves with superior
damping characteristics.
These waves are then radiated from the cabinet
opening as high-amplitude signals. The system
can, therefore, by employing the negative­impedance output drive amplifier and a speaker
cabinet featuring a Helmholtz resonator, reproduce
an extremely wide range of frequencies with
outstanding sound quality and low distortion.
The features described above combine to create the
fundamental structure of conventional YAMAHA
Active Servo Technology.

Our new Active Servo Technology — Advanced
YA MAHA Active Servo Technology — adopts
Advanced Negative Impedance Converter (ANIC)
circuits, which allow the conventional negative
impedance converter to dynamically vary to select
an optimum value for speaker impedance variation.
With these new ANIC circuits, Advanced
YA MAHA Active Servo Technology provides a
more stable performance and improved sound
pressure compared to conventional YAMAHA
Active Servo Technology, resulting in more natural
and dynamic bass reproduction.

High-amplitude
bass sound

Cabinet

Port

Advanced Negative
impedance Converter

Signals of low amplitude

Air woofer
(Helmholtz resonator)

Active Servo
Processing
Amplifier

Signals

9

Troubleshooting

Refer to the chart below if the unit does not function properly. If the problem you are experiencing is not
listed, or if the instructions fail to help you resolve the problem, disconnect the power cord and contact your
authorized YAMAHA dealer or service center.

Problem Cause What to Do

No sound.

Sound level is too low.

For the Subwoofer (SW-P270) only

Problem Cause What to Do

Power is not supplied even though the
POWER switch is set to the ON position.

No sound.

Sound level is too low.

Speaker cables are not connected
securely.

Speaker cables are not connected
correctly.

The power plug is not securely
connected.

The VOLUME control is set to 0. Turn the VOLUME control to the

The subwoofer cable is not connected
securely.

You are playing a sound source that
includes inadequate bass frequencies.

The sound level has been diminished
by standing waves.

Connect the speaker cables securely.

Connect the speaker cables correctly:
L (left) to L, R (right) to R, “+” to
“+” and “–” to “–”.

Turn the power switch OFF, then
connect the power plug securely.

right (clockwise).
Connect the subwoofer cable

securely.
Play a sound source that includes

more bass frequencies.
Reposition the subwoofer, or break

up the parallel wall surface by
placing bookshelves or other large
objects along the wall.

10

Specifications

V

Frequency characteristics

The following graph displays the frequency
characteristics of the SW-P270 subwoofer.

100 dB

90

80

70

60

50

40

20 50 100 200 500 Hz

NX-E270/NX-C270

Type .........Full-range acoustic-suspension speaker

system, Magnetically shielded type

Driver

<NX-E270> .....................8 cm (8-5/32”) woofer +

1.9 cm (3/4”) balanced-dome tweeter

<NX-C270>

Nominal Input Power..................................... 30 W

Maximum Input Power

<NX-E270> ................................................. 80 W

<NX-C270> ................................................100 W

Impedance........................................................ 6 Ω

Frequency Response

<NX-E270> ................ 100 Hz – 25 kHz (–10 dB)

<NX-C270> .................130 Hz – 20 kHz (–10 dB)

Sensitivity

<NX-E270> ................................. 85 dB/2.83 Vm

<NX-C270> .................................. 85 dB/2.83 Vm

Dimensions (W x H x D)

<NX-E270> ........... 105 mm x 151 mm x 113 mm

<NX-C270> ..............300 mm x 72 mm x 113 mm

..............................5 cm (2") full-range

cone speaker x 2

(4-1/8” x 5-15/16” x 4-7/16”)

(11-13/16” x 2-27/32” x 4-7/16”)

The following graph displays the frequency
characteristics of the SW-P270 subwoofer
combined with NX-E270 speakers.

100 dB

90

80

OLUME

70

60

50

40

20 50 100 200 500 Hz

SW-P270

NX-E270

SW-P270

Type

... Advanced

Driver .........................16 cm (6-5/16") cone woofer

Output Power......... 50 W (100 Hz, 5 Ω at THD=10%)

Dynamic Power

Input Impedance

Frequency Response ...................30 Hz – 200 Hz

Input Sensitivity............ INPUT (1P RCA

Power Supply

[U.S.A. and Canada models] ......AC 120 V, 60 Hz

[Australia model].........................AC 240 V, 50 Hz

[U.K. and Europe models]...........AC 230 V, 50 Hz

[China, Korea, Asia and General models]

........................ AC 110-120/220-240 V, 50/60 Hz

Dimensions (W x H x D)

.............................. 200 mm x 365 mm x 370 mm

Weight.......................................... 8.5 kg (18.7 lbs.)

Specifications are subject to change without notice.

YAMAHA

Active Servo Technology

Magnetically shielded type

....................................... 100 W, 5 Ω

... INPUT (1P RCA pin jack): 12 kΩ

pin jack

100 mV (100 Hz, 5 Ω at 50 W)

(7-7/8” x 143-23/32” x 14-9/16”)

):

Weight

<NX-E270> ................................................ 0.8 kg

<NX-C270> ................................................ 0.9 kg

11

YAMAHA ELECTRONICS CORPORATION, USA
YAMAHA CANADA MUSIC LTD.
YAMAHA ELECTRONIK EUROPA G.m.b.H.
YAMAHA ELECTRONIQUE FRANCE S.A.
YAMAHA ELECTRONICS (UK) LTD.
YAMAHA SCANDINAVIA A.B.
YAMAHA MUSIC AUSTRALIA PTY, LTD.

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