Yamaha Audio NS-55 User Manual

NS-55 NS-45

HOME CINEMA MAIN SPEAKER

Thank you for selecting this Yamaha speaker system.

PRECAUTIONS

Read these precautions carefully before using your speakers.

● Any time you notice distortion, reduce the volume of your
amplifier. Never allow your amplifier to be driven into “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
never to exceed the speakers’ maximum input.

● Do not attempt to clean the cabinets with chemical solvents as
this might damage the finish. Use a dry, soft cloth.

● To prevent the cabinets from warping or discoloring, do not
place the speakers where it will be exposed to direct sunlight
or excessive humidity.

CONNECTION TO YOUR AMPLIFIER

BEFORE MAKING CONNECTIONS, MAKE SURE THAT THE
AMPLIFIER IS SWITCHED OFF.

■ CONNECTIONS

● Connect the screw-type input terminals at the rear of the
speakers to the speaker output terminals of your amplifier with
the provided speaker cords.

● One side of the speaker cord is red and the other side is black.
Connect the (+) terminals on both the amplifier and the
speakers using this red side. Connect the (–) terminals on both
components using the black side of the cord.

● Connect one speaker to the left (marked L) terminals of your
amplifier, and another speaker to the right (marked R)
terminals, making sure not to reverse the polarity (+, –). If one
speaker is connected with reversed polarity, the sound will be
unnatural and lack bass.

● 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.

● Do not place the speakers on the same shelf or rack as the
turntable. The vibration of the speakers might cause the
feedback.

● Secure placement or installation is the owner’s
responsibility.
YAMAHA shall not be liable for any accident caused by
improper placement or installation of the speakers.

Loosen

Tighten

Black(–)

Red (+)

Red line

Procedures:

➀ Loosen the terminal knob.
➁ Insert the bare wire end properly into the terminal hole.

[Remove approx. 10 mm (3/8”) insulation from the speaker
cord.]

➂ Tighten the knob.
➃ Test the security of the connection by pulling lightly the cord

at the terminal.

* Banana Plug connections

are also possible. First
tighten the terminal knobs,
and then insert the
Banana Plug connector
into the corresponding
terminal hole.

Speaker (R)

Red line

Black line

Note
Do not let the bare speaker wires touch each other as this
could damage the speakers or the amplifier, or both of

Speaker output
terminals of the
amplifier

Amplifier

Speaker (L)

them.

PLACING THE SPEAKERS

SPECIFICATIONS

● Place the speakers on a sturdy vibration-free surface. If you
cannot obtain good bass quality when the speakers are placed
directly on the floor, insert a block etc. between the speakers
and the floor.

● Better stereo images will be obtained when the speakers are
slightly angled in towards the listeners.

Note
Bacause these speakers are not a magnetically shielded
type, there may be some influence on a TV picture
depending on the type of TV or the placement of the
speakers. In such a case, place the speakers apart from the
TV.

<NS-55>

Type...................... 3-way 4-speaker bass-refrex speaker system

Speaker Unit..............................................20 cm cone woofer x 2

10 cm cone mid-range

3 cm dome tweeter

Nominal Impedance...........................................................6 ohms

Frequency Response.............................40 Hz – 20 kHz (–10 dB)

Nominal Input Power..............................................................70W

Maximum Input Power .........................................................250W

Sensitivity.....................................................................90 dB/W·m

Dimensions (WxHxD)....................................264 x 886 x 316 mm

......................................................(10-3/8” x 34-7/8” x 12-7/16”)

Weight.......................................................13.6 kg (29 lbs. 15 oz.)

Accessories..............................................Speaker cable (4m) x 1

<NS-45>

Type.......................2-way 3-speaker bass-reflex speaker system

Speaker Unit..............................................16 cm cone woofer x 2

3 cm dome tweeter

Nominal Impedance...........................................................6 ohms

Frequency Response.............................43 Hz – 20 kHz (–10 dB)

Nominal Input Power..............................................................60W

Maximum Input Power .........................................................220W

Sensitivity.....................................................................90 dB/W·m

Dimensions (WxHxD)....................................230 x 780 x 275 mm

................................................(9-1/16” x 30-11/16” x 10-13/16”)

Weight.......................................................10.8 kg (23 lbs. 13 oz.)

Accessories..............................................Speaker cable (4m) x 1

* Specifications subject to change without notice due to product

improvements.

* Care should be taken not to exceed the input power values

noted above.

REMOVING THE FRONT COVER

The front cover is fixed to the cabinet at six points, and can be
removed if desired. To remove the cover, hold both sides and
slowly pull straight away from the speaker. To reattach, line up
the six pegs on the inside surface of the cover with the six
corresponding holes on the speaker and push gently.

NS-55 NS-45

Note
When the cover is removed, take care not to touch the
speaker units with your hands or to exert excessive force
with tools.

V276650