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Yamaha NS-P240 Owner's Manual

NS-P246

Made by: Yamaha
Type: Owner's Manual
Category: Speaker System
Pages: 16
Size: 0.45 MB

 

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i

NS-P240
NS-P246

(NS-P240/NS-P246: NX-S120 + NX-C120 + SW-P240)

NS-P240
HOME CINEMA 5.1CH SPEAKER SYSTEM

NS-P246
HOME CINEMA 6.1CH SPEAKER SYSTEM

OWNER’S MANUAL

NS-P240
NS-P246

(NS-P240 / NS-P246:  NX-S120 + NX-C120 + SW-P240)

HOME CINEMA 5.1CH SPEAKER PACKAGE
HOME CINEMA 6.1CH SPEAKER PACKAGE

OWNER’S MANUAL

NSP240,246̲U.book Page i Wednesday, October 22, 2003 3:29 PM

 


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i

 

IMPORTANT SAFETY INSTRUCTIONS

 

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.

 

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.

 

15

 

Be sure to allow a space of at least 20 cm above, 
behind and on both sides of SW-P240.

 

16

 

Do not place the following objects on SW-P240:
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.

 

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.

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.

NSP240,246̲U.book Page i Wednesday, October 22, 2003 3:29 PM

 


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ii

 

We Want You Listening for a Lifetime

 

Yamaha and the Electronic Industries Association’s Con-
sumer Electronics Group want you to get the most enjoy-
ment 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.

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.

 

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: 

 

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 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.

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 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.

NSP240,246̲U.book Page ii Wednesday, October 22, 2003 3:29 PM

 


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iii

 

Precautions

 

To assure the finest performance, please read this 
manual carefully. Keep it in a safe place for future 
reference.

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.

To prevent the enclosure from warping or discoloring, 
do not expose the speakers to direct sunlight or exces-
sive humidity.

Avoid installing the speakers where foreign objects 
may fall onto them and/or where they may be 
exposed to liquid dripping or splashing.

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

• Other components, as they might damage or dis-

color 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 speak-
ers.

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.

Placing the speakers on the same shelf or rack as the 
turntable can result in feedback.

Secure placement or installation is the owner’s respon-
sibility. Yamaha is not liable for accidents caused by 
improper placement or installation of speakers.

If you note distortion, reduce the volume control on 
your amplifier. Do not drive your amplifier to the 
point of “clipping.” Otherwise, the speakers may be 
damaged.

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’ max-
imum input.

Do not clean the speakers with chemical solvents as 
this might damage the finish. Use a clean, dry cloth.

Do not attempt to modify or fix the speakers. Contact 
qualified Yamaha service personnel when service is 
needed. Do not open the cabinet under any circum-
stances.

Please read the “Troubleshooting” section regarding 
common operating errors before concluding that the 
speakers are faulty.

 

For the SW-P240

 

Do not operate this unit upside down. It may over-
heat, possibly causing damage.

Do not use excessive force on switches, controls or 
connection wires. When moving this unit, first dis-
connect the power plug and the wires connected to 
other equipment. Never pull the wires themselves.

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 dam-

age. Furthermore, do not position the unit with the 
rear panel facing down on the floor or other surfaces.

When using a humidifier, be sure to avoid condensa-
tion inside this unit by allowing enough space around 
the unit and avoiding excess humidification. Conden-
sation might cause fire, damage to the unit, or electric 
shock.

Do not cover the rear panel of this unit with a news-
paper, 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.

Do not plug this unit into a wall outlet until all con-
nections are complete.

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, dam-
age to the unit, or personal injury. Yamaha is not 
responsible for damage resulting from use of this unit 
with a voltage other than specified.

To prevent damage from lightning, disconnect the AC 
power plug during electric storms.

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.

This unit may be damaged if certain sounds are con-
tinuously output at high volume level. For example, if 
20Hz–50Hz sine waves from a test disc or bass 
sounds from an electronic instrument, etc. are contin-
uously output, or if a turntable stylus touches the sur-
face of a disc, reduce the volume level to prevent the 
unit from being damaged.

If you hear distorted noise (i.e., unnatural, intermit-
tent “rapping” or “hammering” sounds) from this 
unit, reduce the volume level. Extremely loud movie 
soundtrack low frequency, bass-heavy sounds, or sim-
ilarly loud popular music passages can damage the 
speaker system.

Vibration generated by super-bass frequencies may 
distort images on a TV. In this case, move the unit 
away from the TV set.

When disconnecting the power cord from the wall 
outlet, grasp the plug; do not pull the cord.

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.

Do not place much pressure against the subwoofer 
net. It may break the net or the unit may fall, resulting 
in injury.

Do not place anything fragile beside the subwoofer. 
The air pressure produced by the subwoofer may 
break the objects and cause malfunction or injury.

 

WARNING

 

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

NSP240,246̲U.book Page iii Wednesday, October 22, 2003 3:29 PM

 


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1

 

Table of contents

 

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

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

 

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

 

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

 

Positioning the front and surround speakers (NX-S120) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Positioning the center speaker (NX-C120) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Positioning the subwoofer (SW-P240)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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-P240) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

 

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

 

Advanced Yamaha Active Servo Technology (on the SW-P240) . . . . . . . . . 9

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

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

 

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

NSP240,246̲U.book Page 1 Wednesday, October 22, 2003 3:29 PM

 


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2

 

Introduction

 

Thank you for choosing a Yamaha NS-P240 or NS-P246 Home Cinema 5.1/6.1 Channel Speaker System. 
Each of these systems include the following speakers:

 

• NX-S120

 

The NX-S120 are full-range acoustic-suspension speakers. Each system includes two (2) front and two 
(2) surround speakers. In addition, the NS-P246 system includes an additional NX-S120 that serves as a 
surround back speaker.

 

• NX-C120

 

The NX-C120 is a full-range acoustic-suspension center speaker.

 

• SW-P240

 

The SW-P240 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 Yamaha 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-P246)

Center speaker

Subwoofer

NX-S120

X 4 <NS-P240>
X 5 <NS-P246> 

NX-C120

SW-P240

Speaker cables

Subwoofer cable

Fasteners
(for NX-C120)

Non-skid pads 
(for NX-S120)

Non-skid pads 
(for SW-P240)

X 2

[4m]

<NS-P240> 

<NS-P246> 

X 2 <NS-P240> 
X 3 <NS-P246> 

[15m] 

X 3

Mounting brackets

X 4 <NS-P240> 
X 5 <NS-P246> 

Screws for mounting 
brackets

X 4 <NS-P240> 
X 5 <NS-P246> 

NSP240,246̲U.book Page 2 Wednesday, October 22, 2003 3:29 PM

 


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3

 

Setting up the speakers

 

Before you connect the speakers, place each 
speaker in its respective location. Speaker position-
ing is very important as it affects the overall sound 
quality of the system. Place the speakers in loca-
tions 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 “Position-
ing the subwoofer (SW-P240)” 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.

 

Positioning the front and surround 

 

speakers (NX-S120)

 

Front speakers: 

 

Place the two front speakers on 

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

 

Surround speakers: 

 

Place the left and right 

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

 

Surround back speaker (for NS-P246 sys-
tems only): 

 

Position the surround back 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 infor-
mation, see “Mounting the front and surround 
speakers” on page 5.)

 

Non-skid pads: 

 

When placing the speakers on a 

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.

Center

Front R

Subwoofer

TV-set

Front L

Surround back
(for NS-P246)

Surround R

Surround L

Non-skid pad

NSP240,246̲U.book Page 3 Wednesday, October 22, 2003 3:29 PM

 


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4

 

Positioning the center speaker 

 

(NX-C120)

 

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, to pre-
vent 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.

 

Cautions:

 

Do not place the center speaker on a TV that has a top 
surface area smaller than the speaker bottom. Other-
wise, 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 fas-
tener is to be applied. Note that adhesive strength will 
be weakened if the surface is dirty, oily or wet. Weak-
ened adhesive may cause the center speaker to fall.

 

Positioning the subwoofer 

 

(SW-P240)

 

Although the placement of the subwoofer is not as 
critical as that of the other speakers, it is best to 
place the subwoofer outside either the right or left 
front speaker. (See Figure 

 

A

 

.)

The placement shown in Figure 

 

B

 

 is also accept-

able. However, in some cases, if you listen from 
the center of the room, the super-bass range from 
the subwoofer may sound weak. This is due to 
“standing waves” that can develop between paral-
lel walls that effectively diminish or cancel the 
bass sound. In this event, face the subwoofer 
obliquely to the wall. It also may help to break up 
the parallel surface by placing bookshelves or 
other large objects along the wall.

 

Non-skid pads:

 

 Place the included non-skid 

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

Big screen

Fastener

Peel off the 
seal.

A

B

: Subwoofer

: Front speaker

NSP240,246̲U.book Page 4 Wednesday, October 22, 2003 3:29 PM

 


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5

 

Mounting the front and surround 

 

speakers 

 

You can place the front and surround speakers (and 
surround back speaker in an NS-P246 system) on a 
shelf or rack, set them on the floor, or mount them 
on a wall or speaker stand.

 

To mount the speakers on a wall:

1.

 

Affix screws to a firm wall or wall support as 
shown below. (Use tapping screws 3.5 to 4mm 
in diameter.)

 

2.

 

Suspend the speaker by mounting the holes in 
the speaker’s back panels on the protruding 
screws.

 

Cautions:

 

Each front or surround speaker weighs 0.9 kg 
(2.0 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 speak-
ers may fall, possibly damaging the speakers or caus-
ing personal injury.

Do not affix the speakers to a wall using nails, adhe-
sives, or unstable hardware. Long term use and vibra-
tion 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.

 

To attach to a bracket:

1.

 

Attach a bracket (part number AAX34790) to 
the bottom of the speaker using a screw (part 
number AAX12390) such that the convex part 
of the bracket fits over the groove in the bottom 
of the speaker, as shown below.

 

2.

 

Mount the speaker on the speaker stand by affix-
ing a pair of screws through the outside bracket 
holes.

 

To mount the speakers on a speaker 
stand:

 

You can mount the front, surround, and surround 
back speakers on a speaker stand, such as the 
optional Yamaha SPS-80. (For more information, 
refer to the instruction manual for the SPS-80.)

 

Note:

 

 The SPS-80 may be unavailable in certain 

regions.

Holes

10 mm

Minimum 

20 mm

70 mm

70 mm

Wall/ wall

support

Note: 

Make sure that the 

screws are securely affixed in 
the narrow part of the holes.

70 mm

Insert only M4 screws 
through the outside holes.

Mounting 
bracket 
(AAX34790)

Screw 
(AAX12390)

60 mm

Yamaha SPS-80

speaker stand

(optional)

NSP240,246̲U.book Page 5 Wednesday, October 22, 2003 3:29 PM

 


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6

 

Connections

 

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

 

Basic connection example

To AC outlet

Center speaker

Surround back speaker 

(in NS-P246 systems)

Subwoofer

Amplifier

Front speakers

Surround speakers

Right

Right

Left

Left

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

NSP240,246̲U.book Page 6 Wednesday, October 22, 2003 3:29 PM

 


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7

 

Connecting speaker cables

 

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

 

Before connecting the cables:

 

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

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.

 

Inserting the cables:

1.

 

Press and hold the terminal tab, as shown in the 
figure below.

 

2.

 

Insert the stripped wire core.

 

3.

 

Release your finger from the tab to allow it to 
lock securely on the cable’s wire core.

 

4.

 

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

 

Note:

 

 Do not let uninsulated speaker wires touch 

each other as this could damage the speaker or the 
amplifier.

 

Connections:

 

Connect the front, center and surround speakers (and 
surround back speaker for the NS-P246) 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-P246). Connect each 
speaker cable to the corresponding speaker as illus-
trated 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 ampli-
fier (or AV receiver) to the INPUT terminal on the 
subwoofer.

 

Connecting components and the 

 

subwoofer to AC power

 

After you complete all speaker and subwoofer con-
nections, plug the amplifier, other audio/video 
components, and the subwoofer into an AC outlet 
of appropriate voltage. Make sure the subwoofer’s 
VOLUME control is set to 0 before proceeding to 
adjust the speaker balance as described on page 8.

Red: positive (+)

Black: negative (–)

Red: positive (+)

Black: negative (–)

White broken line

NSP240,246̲U.book Page 7 Wednesday, October 22, 2003 3:29 PM

 


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8

 

Using the subwoofer (SW-P240)

 

1

 

Power indicator

 

Lights up GREEN when the 

 

POWER 

 

switch 

(

 

4

 

) is turned ON; turns off when the 

 

POWER 

 

switch is turned OFF.

 

2

 

VOLUME control

 

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

 

3

 

INPUT terminal

 

Input terminal for line level signals from the 
amplifier.

 

4

 

POWER switch

 

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 OFF position to turn off the 
power of the subwoofer.

 

Pre-adjusting the subwoofer vol-

 

ume 

 

Before you use the subwoofer, first adjust the vol-
ume 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 
green.

 

4.

 

Play a source that contains low-frequency 
sounds. Adjust the amplifier’s volume control to 
the desired listening level.

 

5.

 

Increase the volume gradually to adjust the vol-
ume balance between the subwoofer and the 
front 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-S120) with 
other speakers, you must again balance the subwoofer 
and surround speaker volume.

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

110V-120V

VOLTAGE

SELECTOR

220V-240V

OFF

POWER

ON

VOLUME

INPUT

OFF

POWER

ON

4

VOLUME

2

1

3

INPUT

Rear panel

NSP240,246̲U.book Page 8 Wednesday, October 22, 2003 3:29 PM

 


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9

 

Advanced Yamaha Active Servo Technology (on the SW-P240)

 

The theory behind Yamaha Active Servo Technol-
ogy is based on two factors: the Helmholtz resona-
tor and negative-impedance drive. Active Servo 
Processing speakers reproduce the bass frequen-
cies 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 ampli-
tude 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 nega-
tive-impedance output-drive amplifier that sub-
tracts the output impedance of the amplifier.

By employing negative-impedance drive circuits, 
the amplifier is able to generate precise, low-ampli-
tude, 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 negative-imped-
ance output drive amplifier and a speaker cabinet 
featuring a Helmholtz resonator, reproduce an 
extremely wide range of frequencies with out-
standing 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 
Yamaha 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 Yamaha 
Active Servo Technology provides a more stable 
performance and improved sound pressure com-
pared to conventional Yamaha Active Servo Tech-
nology, resulting in more natural and dynamic bass 
reproduction.

High-amplitude 
bass sound

Cabinet

Port

Air woofer 
(Helmholtz resonator)

Advanced Negative 
impedance Converter

Active Servo
Processing
Amplifier

Signals of low amplitude

Signals

NSP240,246̲U.book Page 9 Wednesday, October 22, 2003 3:29 PM

 


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10

 

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.

 

For the Subwoofer (SW-P240) only

 

Problem

Cause

What to Do

 

No sound.

 

Speaker cables are not connected 
securely.

Connect the speaker cables securely.

 

Sound level is too low.

 

Speaker cables are not connected 
correctly.

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

 

Problem

Cause

What to Do

 

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

 

The power plug is not securely 
connected.

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

 

No sound.

 

The VOLUME control is set to 0.

Turn the VOLUME control to the 
right (clockwise).

Speaker cables are not connected 
securely.

Connect the speaker cables securely.

 

Sound level is too low.

 

Speaker cables are not connected 
correctly.

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

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

Play a sound source that includes 
more bass frequencies.

The sound level has been diminished 
by standing waves.

Reposition the subwoofer, or break 
up the parallel wall surface by 
placing bookshelves or other large 
objects along the wall.

NSP240,246̲U.book Page 10 Wednesday, October 22, 2003 3:29 PM

 


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11

 

Specifications

 

Frequency characteristics

 

The following graph displays the frequency char-
acteristics of the SW-P240 subwoofer. 

The following graph displays the frequency char-
acteristics of the SW-P240 subwoofer combined 
with NX-S120 speakers.

 

NX-S120/NX-C120

 

Type

 

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

system 
Magnetically shielded type

 

Driver

 

............5 cm (2") full-range cone speaker x 2

 

Nominal Input Power

 

..................................... 30 W

 

Maximum Input Power

 

................................. 100 W

 

Impedance

 

.........................................................6 

 

 

Frequency Response

 

... 100 Hz – 25 kHz (–10 dB)

 

Sensitivity

 

...................................... 86 dB/2.83 Vm

 

Dimensions (W x H x D)

 

<NX-S120> ............. 72 mm x 170 mm x 108 mm

(2-15/16" x 6-11/16" x 4-1/4")

<NX-C120> ..............300 mm x 72 mm x 105 mm

(11-13/16" x 2-15/16" x 4-1/8")

 

Weight

 

<NX-S120> .....................................0.9 kg (2 lbs.)

<NX-C120> ............................1.1 kg (2 lbs. 7 oz.)

 

SW-P240

 

Type

 

....... Advanced Yamaha Active Servo Tech-

nology 
Magnetically shielded type

 

Driver

 

.............................. 16 cm (6.5") cone woofer

 

Output Power

 

......... 50 W (100 Hz, 5 

 

 

 at THD=10%)

 

Dynamic Power

 

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

 

 

Input Impedance

 

......INPUT (1P RCA pin jack): 12 k

 

 

Input Sensitivity

 

............ INPUT (1P RCA pin jack): 

30 mV (100 Hz, 5 

 

 

 at 50 W)

 

Power Supply

 

............................... AC 120 V, 60 Hz

 

Dimensions (W x H x D)

 

...............................200 mm x 365 mm x 390 mm

(7-7/8" x 14-3/8" x 15-3/8")

 

Weight

 

.....................................8.4 kg (18 lbs. 8 oz.)

 

Specifications are subject to change without notice.

20

50

100

200

500 Hz

40

50

60

70

80

90

100 dB

20

50

100

200

500 Hz

40

50

60

70

80

90

100 dB

SW-P240

NX-S120

VOLUME

NSP240,246̲U.book Page 11 Wednesday, October 22, 2003 3:29 PM

 


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2003

All rights reserved.

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NSP240,246̲U.book Page 12 Wednesday, October 22, 2003 3:29 PM