Yamaha Speaker System Advanced Yst And Qd Bass Subwoofers Users Manual SW800/320 Cat.(U/C)

Advanced YST and QD-Bass Subwoofers to the manual 5d45a85a-0cb8-476a-8289-96023920dddb

2014-12-13

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The Dramatically Different

Subwoofers
YST-SW800/YST-SW320

Advanced YST and QD-Bass Subwoofers.
High Power and Superb Bass Clarity.

The Latest Advance in the
Audio Reproduction Excell
Yamaha has a tradition of excellence in creating fine
sound that goes back more than a century to when
we made our first reed organs. Today, we combine
extensive expertise in both sound production (musical
instruments) and reproduction (audio and acoustics),
making us uniquely capable of creating innovative
products to enrich people’s lives.
As the world’s leading musical instrument
manufacturer, we use our acoustic craftsmanship to
develop a wide range of superior products. Our wideranging capabilities, including woodworking and
metallurgical expertise, are put to good use in the
creation of audio speakers.
Having established our preeminence in the
audio field with legendary products like the NS-1000M
monitor speakers, we are now further expanding
home entertainment possibilities with an exciting new
range of products, of which the YST-SW800 and
YST-SW320 Subwoofers are outstanding examples.

The Dramatically D

Yamaha Tradition of
ence.
Subwoofers for the
Digital Era
Now that audio and video have largely
moved to digital formats, the demands on
speaker systems are greater than ever.
The latest home theater systems, in
particular, not only use high-performance
DVD players, but also exploit the merits of
advanced sound processing formats like
Dolby Digital and DTS Digital Surround.
Full audio enjoyment of these digital
sources requires deep, clear bass
response. This is especially true with 5.1
(6.1)-channel sound, because the sixth
channel is dedicated to the bass
frequencies. That means you not only
need a subwoofer, but a subwoofer
capable of handling extremely low
frequencies and high power levels, as well
as accurately reproducing the high quality
digital sound. Your best choice? The
YST-SW800 and YST-SW320 Subwoofers.

YST-SW800

YST-SW320

fferent Subwoofers

Innovative Design and Technology
Impressive Subwoofer Performance.
25mm (1") MDF Cabinet

Advanced YST

The beautifully finished cabinet uses
ultra-thick (25mm; 1") medium
density fiberboard for minimum
resonance.

A unique system in which the speaker
and amplifier work together to cancel out
impedance so the speaker unit has a
perfectly linear motion.

Extra-Long Stroke
Drivers
Extra-long stroke, pure
spruce multi-range
drivers provide
outstanding power with
low distortion.

QD-Bass
Technology
QD-Bass (Quatre
Dispersion Bass)
technology uses downfiring drivers with square,
pyramid-shaped reflective
plates to radiate the
sound efficiently in four
horizontal directions.

The YST-SW800 and YST-SW320 use
Yamaha’s Advanced YST, as well as brand
new technologies such as QD-Bass to
deliver exceptionally crisp, clean, powerful
bass. They have extremely efficient, highpower amplifiers built in, and use extralong stroke, drivers that provide
outstanding power with low distortion. The
YST-SW800 also introduces new power
supply technology and a driver featuring a
Dual-Bias system with a 100mm (4")
diameter voice coil for the ultimate in power
and performance. But whichever Yamaha
subwoofer you choose, you’ll get dynamic
bass that will bring out the full potential of
your digital music and movie sources.

High Power
Amplifier
The YST-SW800
amplifier is
extremely efficient
and features an
entirely new type of
power supply with
superior load
characteristics,
minimal noise,
higher efficiency
and greater stability.

QD-Bass Technology

QD-Bass Technology
QD-Bass (Quatre Dispersion Bass)
technology uses down-firing drivers with
square, pyramid-shaped reflective plates to
radiate the sound efficiently in four
horizontal directions. The reflective plates
(not used in competitors’ down-firing
subwoofers) negate any effects caused by
the floor surface and reduce resonance
between sound waves reflected from the
floor and the unit. Also, most other systems
use circular cones, but by radiating in four
directions to avoid the legs of the cabinet,
QD-Bass reduces turbulence caused by
reflection from the legs. Changing the
height of the square pyramid varies the
acoustic load, permitting relatively simple

Results in Truly
Extra-Long Stroke Driver Construction
High-Strength
25cm (10") Spruce Cone

high-cut adjustment and improved
bandpass properties.
The QD-Bass system provides
extraordinary power and smooth frequency
response from an extremely compact unit. It
also allows greater freedom of placement,
since the sound radiates with equal
effectiveness in all directions.

Dust Cap

Long Excursion Surround

High-Linearity
Suspension with
Double Spiders

Top Plate
100mm (3/8") ⭋
Voice Coil

Dual-Bias
Magnet System

Heavy-Duty
Aluminum
Diecast Frame

High-Efficiency Power Amplifier
and Power Supply
The YST-SW800 and YST-SW320 deliver
high power outputs at deep bass levels,
with excellent stability and low power
consumption, even with their compact
cabinets. This is made possible by highly
efficient power amplifier technology and, in
the YST-SW800, a new power supply.
The power amplifier achieves superior
conversion efficiency by supplying
maximum power (minimizing power loss)
from the power transistors according to the
output level. It delivers stable power output
with high efficiency while minimizing power
consumption and heat production. It does
not require an output filter coil, resulting in
extremely low noise and distortion. High
speed transient response is also excellent.
The YST-SW800 also uses a new power
supply that features superior load
characteristics, minimal noise, higher
efficiency and greater stability. Switching
power supplies, commonly used in audio
and other consumer products, are small
and efficient, but suffer from noise
problems, requiring additional components
to solve. This power supply, however, holds
the voltage and current levels to zero while

Yoke
Ferrite Magnets

YST-SW800 Rear Panel

the device turns on and off. This reduces
noise to 1/30 of conventional switching
power supplies. Power loss during
switching is also reduced, enabling an
incredibly high power conversion
efficiency. Other advantages of this power
supply include superb stability against
power load fluctuations, large capacity,
low impedance and silent operation.

Extra-Long Stroke,
Pure Spruce Dual-Bias Drivers
These new drivers provide outstanding
power with low distortion and are superior
to conventional drivers for a number of
reasons. Due to the use of a vertically
aligned, dual magnetic circuit structure
with 100mm (4") diameter voice coils, they

are able to handle extremely high input
power in a compact unit, with low radial
distortion. Additionally, the vertically
symmetrical gap magnetic flux density
distribution reduces secondary
(asymmetrical) distortion.
Double spider construction also aids in
handling high bass inputs without cone
deformation. And the strong diecast frame
firmly anchors the entire body including the
magnetic circuit, guaranteeing a structure
that will not fail under powerful forces.

Advanced YST
Advanced Yamaha Active Servo
Technology (Advanced YST) is a unique
system in which the speaker and amplifier
work together to cancel out impedance so
the speaker unit has a perfectly linear
motion. Advanced YST helps to ensure the
highest levels of sound pressure and
overall performance.

Space-Saving Voice Coil (Voice Coil: 100mm (4") )
Dual-Bias System

Conventional System

Voice Coil
100mm (4")
N

Voice Coil
100mm (4")
N

N

S

S

S

N

N

N

S

S

S

Main Magnet

Slim

Efficient Power Amplifier and Power Supply

Main Magnet

Shielding Magnet

Wide

YST-SW800 Extra-Long Stroke

Five Ways to Enjoy the Power and
of Yamaha Bass.

YST-SW800

YST-SW320

Digital Pro Series Subwoofer

Digital Pro Series Subwoofer

This subwoofer is the best that Yamaha
has to offer. New design, new
technology, and a new dimension of
power bass performance. Featuring
QD-Bass technology and Advanced YST,
it also introduces a new Dual-Bias driver
and a new power supply. Experience
bass down to 18Hz with up to 1,000W
of power: awesome!

Another powerful demonstration of the
advantages of QD-Bass technology. The
YST-SW320 disperses 250W of pure bass
power in four directions from its downfiring drivers. The 25cm (10”) driver has
an extra-long stroke design for greater
stability and durability. Advanced YST
adds to the outstanding performance.

Subwoofers
Advanced Yamaha Active Servo Technology
QD-Bass (Quatre Dispersion Bass) Technology
High-Efficiency Power Amplifier
High-Efficiency Power Supply
Drivers

Magnetic Shielding
High Cut Filter (Continuously Variable Control)
Phase Control (Normal or Reverse)
Auto Standby
BASS (Bass Action Selector System)
Two Input Connections (Speaker or Line Level)
2-Way Binding-Post Speaker Terminals
Output Power
Frequency Response
Dimensions (W x H x D)
Weight

YST-SW800
Yes (Advanced YST)
Yes
Yes
Yes
25cm (10") multi-range,
extra-long stroke design
with dual-bias system
Yes
40–140 Hz
Yes
Yes
Yes
Yes
Yes
1,000 W
18–160 Hz (–10 dB)
390 x 482 x 420 mm
15-3/8" x 19" x 16-9/16"
24 kg; 52.9 lbs.

YST-SW320
Yes (Advanced YST)
Yes
Yes

YST-SW160
Yes (Advanced YST)

YST-SW90
Yes (Advanced YST)

YST-SW45
Yes (Advanced YST)

25cm (10") multi-range,
extra-long stroke design

Dual 20cm (8") multi-range

20cm (8") multi-range

20cm (8") multi-range

Yes
40–140 Hz
Yes
Yes
Yes
Yes
Yes
250 W
20–160 Hz (–10 dB)
340 x 432 x 370 mm
13-3/8" x 17" x 14-9/16"
17 kg; 37.5 lbs.

Yes
40–140 Hz
Yes
Yes
Yes
Yes
Yes
150 W
20–160 Hz (–10 dB)
235 x 602 x 463 mm
9-1/4" x 23-11/16" x 18-1/4"
20 kg; 44.9 lbs.

Yes
50–150 Hz
Yes
Yes

Yes
50–150 Hz

Yes
Yes
100 W
23–170 Hz (–10 dB)
235 x 485 x 409 mm
9-1/4" x 19-1/8" x 16-1/8"
14 kg; 30.9 lbs.

Yes
Yes
70 W
30–200 Hz (–10 dB)
235 x 365 x 318 mm
9-1/4" x 14-3/8" x 12-1/2"
9 kg; 19.8 lbs.

Yes

Precision

YST-SW160

YST-SW90

YST-SW45

Digital Home Theater Subwoofer

Digital Home Theater Subwoofer

Digital Home Theater Subwoofer

With dual 20cm (8") drivers,
Advanced YST and a 150W high
power amplifier, this subwoofer is
capable of delivering a powerful
punch. There’s a BASS (Bass Action
Selection System) mode for automatic
adjustment of frequency response,
Phase Control, Auto Standby and a
High Cut Filter.

An all-discrete 100W high power
amplifier and the highly efficient
Advanced YST system give this
subwoofer exceptional performance
capabilities. A Continuously Variable
High Cut Filter ensures best matching
with room conditions and other
speakers. Plus Auto Standby and more
in a slim design.

Using the Advanced YST system to
deliver deep bass with 70 watts of
power from a compact body, the
YST-SW45 provides tremendous
value. It also offers useful features like
Continuously Variable High Cut Filter,
Auto Standby and Two-Way Input. A
great choice for anyone considering a
dual subwoofer system.

Advanced Yamaha Active Servo Technology
(Advanced YST) combines the excellent
imaging and point source characteristics of
small speakers with the superb bass response
of large ones. The key to its success is a
Helmholtz resonator—a small port in the
speaker cabinet. The cabinet volume and port
size are scaled to an exact ratio, which causes
small amplitude input signals to be magnified
without distortion. And because zero speaker
impedance results in the best reproduction of

deep bass tones, the Advanced YST system
includes a negative output impedance
amplifier. By precisely matching it to the
Helmholtz system, the combined ampspeaker impedance become zero. This
enables the compact cabinet to reproduce
bass frequencies with close to perfectly flat
response. You’re assured of getting the
highest levels of sound pressure and overall
performance.

To fully optimize bass performance in a highend system, two subwoofers are
recommended.
(dB)
90
80
70

Conventional speaker
Speaker + YST Subwoofer
Increased bass reproduction capability
20

50

100

20,000

(Hz )

YAMAHA CORPORATION
P.O. Box 1, Hamamatsu, Japan

"d-cinema" is the slogan of Yamaha A/V products and technology, reflecting our focus on digital technology and our leadership in
creating and refining digital home theater.

For details please contact:

Visit us at our website: http://www.yamaha.co.jp/

A-1087UEN

10009D Printed in Japan



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