3/4 (U)
NS-777/NS-555/NS-333/NS-C444
NEW PRODUCT BULLETIN
it the ideal choice for these
speakers. It can reproduce
frequencies up to 35kHz and is
powerful. The diffuser over the
tweeter helps improve frequency
response and directionality.
Bi-Wiring Connection Capability
(NS-777 and NS-555)
Bi-wiring means that instead of
connecting the speaker to the
amplifier or receiver with two cables
(plus and minus), you can use four
cables: two for the woofer(s) and two
for the tweeter. This decreases
modulation distortion for purer sound
quality.
Beautiful Yamaha Piano Finish
with Elegant Elliptical Form
As one of the world’s leading piano
manufacturers, Yamaha has a long
history of wood-working expertise.
The EF Series speaker cabinets
feature the same luxurious and
environmentally fliendly finish as our
fine grand
pianos.
requirements by
using a PMD
(Polymer-injected
Mica Diaphragm)
cone woofer. This
diaphragm is
composed of 30%
high quality white Indian Pearl Mica,
chosen for the significant
contribution it makes to sound
quality. In order to maximize its
distinctive qualities, absolutely no
coloring is added to the material.
We’ve also varied the cone
thickness, making it thicker in the
middle, which has been shown to
improve performance. The cone is
extremely light, yet also tough and
durable, with excellent response
speed.
High Quality Monster Cable
Extremely high quality wiring, from
the well-known Monster Cable
Products, is used internally in each
speaker to connect the woofer and
crossover network.
High Frequency Response Dome
Tweeter
The proven capabilities and
durability of this dome tweeter made
Shaping and Controlling the
Sound Field
Waveguide Horns differ from
conventional speaker horns in that
their waveguide features a horizontal
control angle of 135° and a vertical
control angle of 120°. This allows the
sound field to be shaped and
controlled for optimal spatial
expression in home theater
environments. The Waveguide Horn
also provides a much smoother
frequency response than ordinary
horns.
PMD Cone Woofer Makes These
Speakers Ideal for Home Theater
Sound
Home theater speakers must
combine high power capabilities with
excellent sensitivity and dynamic
range, while being designed to
prevent listening fatigue. The new EF
Series speakers meet these
Diaphragm Physical Characteristic
Density
Young’s Ratio
Absorbed Vibration
Acoustic Velocity
(g/cm
3
)
(x10 kg
4
/cm
2
)
Ratio (tan
δ
)
(m/sec)
PMD (Polymer-injected Mica
Diaphram)
Polypropylene Sheet
0.9
1.5
0.06
1,300
Pulp
0.46
1.6
0.03
1,870
1.15
8.0
0.05
2,620
PMD’s superior characteristics help ensure outstanding sound quality.
In order to effectively reproduce digital sound, speakers must have the following capabilities: wide dynamic
range, high efficiency, sensitive response, and high linearity suspension. The PMD used in the EF Series
Speakers plays an important role in providing these capabilities. Its strong points are listed in the chart. Density
affects the speed of signal transmission and shows the speakers’ excellent linearity. Young’s Ratio represents
strength, resulting in high efficiency and sensitive response. Absorbed Vibration Ratio is the value of internal
loss; the lower this value, the lower the signal loss, so it also contributes to high efficiency and sensitive
response. And finally, Acoustic Velocity represents the overall velocity of signal transmission, an important
element in reproducing digital sound. With all these properties, PMD is a material perfectly suited to achieving
the highest, most natural sound quality. The goal of digital sound composers is sound creation that permits the
reproduction of realistic sound, including dialogue and sound effects, and PMD helps make this possible.
Polymer-Injected
Mica Microscope
Photo
50
40
20
10
40
20 10
0
0
30
30
(6 kHz)
Front
Rear
Flat High-Frequency Directional
Characteristics of the Waveguide Horn
Conventional Radiation
Waveguide Horn Radiation (NS-777)
High frequency directional characteristics of an
installed Waveguide Horn speaker (red lines)
and ordinary (blue lines). The Waveguide Horn
speaker shows excellent balance in the front
direction, with the surround effect to the sides
and rear is not adversely affected by reflected
sounds.
