Yamaha YST-RSW300 - Manual (Page 2)

• Dolby, Pro Logic and Double D are trademarks of Dolby Laboratories Corporation. • “DTS ” and “DTS Digital Surround ” are registered trademarks of DTS, Inc.
• CINEMA DSP is a trademark of Yamaha Corporation. • SILENT CINEMA is a trademark of Yamaha Corporation.• Product designs and specifications are subject to change without notice.
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.
Front-Firing Active Design
The subwoofer features a high
performance front-firing, active design. It
provides power and detailed, accurate
reproduction in a compact unit.
270W Dynamic Power
Capable of handling 270W of dynamic
power, this subwoofer ensures that you
hear all bass sounds, even the loudest
short bursts, with fast attack and total
clarity.
Linear Port
The Linear Port provides smooth bass
response during playback and minimizes
extraneous noise.
Large (25cm; 10”) Long-Stroke Cone
Driver with Magnetic Shielding
The powerful, long-stroke cone driver is
exceptionally large (25cm; 10”) for this
class of subwoofer. Magnetic shielding
means there is no distortion-causing
interference when used near a TV or
other monitor.
Other Notable Features
• 20–160Hz frequency response
• Auto standby with sensitivity selector
(High, Low and Off)
• Phase control (Normal or Reverse)
NEW PRODUCT BULLETIN
YST-RSW300
Front-Firing Active Subwoofer
impedance variation. With these new circuits,
Advanced YST II provides more stable
performance and higher sound pressure
levels than the former system, resulting in
more natural and energetic bass
reproduction. The effectiveness of Advanced YST II
(Yamaha Active Servo Technology II) is based
upon two principles: 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 cabinet. This
port is used instead of, and performs the
functions of, a conventional woofer. Low
amplitude signals inside the cabinet can, due
to the Helmholtz Resonance principle, be
output from this port as high amplitude waves
if the design is such that the size of the port
and the volume of the cabinet are in a certain
proportion. In addition, the wave amplitudes
inside the cabinet must be precise and of
sufficient power, in order to overcome the
“load” presented by the air within the cabinet.
This is accomplished by employing an
amplifier that is capable of supplying special
signals. If the electrical resistance of the
voice coil could be reduced to zero, the
Advanced YST II Brings You Super Bass.
High-Amplitude
Bass Sound
Cabinet
Air Woofer
(Helmholtz Resonator)
Advanced Negative-
Impedance Converter
Active
Servo
Processing
Amplifier
Port
movement of the speaker unit would
become linear with respect to signal
voltage. To achieve this, a special negative-
impedance output drive amplifier is used,
so the impedances cancel out and become
zero.
By employing negative-impedance
drive circuits, the amplifier is able to
generate precise, low-amplitude low
frequency waves with superior damping
characteristics. These waves are then
radiated from the cabinet opening as high
amplitude signals. This amplifier/speaker
combination is capable of reproducing an
extremely wide range of frequencies with
excellent sound quality and low distortion.
The Advanced YST II takes this
concept a stop further by adopting
Advanced Negative Impedance Converter
(ANIC) circuits. These circuits allow the
converter to dynamically vary in order to
select the optimum values for speaker
Signals of Low Amplitude
Signals
Advanced YST II produces rich bass sound,
and the addition of a Linear Port reduces
extraneous noise for even higher quality.
Effect of Linear Port
Advanced YST II for Awesome Deep
Bass
Yamaha's newly developed Advanced YST
II (Yamaha Active Servo Technology II)
combines negative-impedance and
constant-current principles to drive the
speaker cone with even
tighter control than
previously. Using
Advanced Negative Impedance Converter
(ANIC) circuits, this system dynamically
optimizes effective speaker impedance to
maintain excellent linearity. This means
more stable and accurate low range
response, not to mention higher sound
pressure levels, for more natural and
energetic bass reproduction.
PWM Digital Drive Amplifier
The YST-RSW300 delivers high power
outputs at deep bass levels, with excellent
stability and low power consumption,
thanks to by a highly efficient PWM Digital
Drive amplifier. The 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
The Subwoofer: a Vital Part of Your
System
DVDs and digital music sources hold a huge
amount of audio data, including a considerable
amount in the low frequency range. Multi-channel
sound formats dedicate an entire channel to the
low frequencies (the “.1” in 5.1-channel sound),
used to deliver the bass in music and explosions,
thunder and other low frequency sound effects in
movies. Ordinary speakers are not large and
robust enough to handle these frequencies,
especially for long periods. This is where the
subwoofer comes in. By outputting bass sounds
with high power and low distortion, it ensures
that you are not missing anything, and it also
makes the overall sound richer and properly
balanced. A subwoofer is thus a vital part of any
home theater or even music-focused system.
YST-RSW300 Connection Panel