YST-SW015 NEW PRODUCT BULLETIN

S u b w o o f e r

YST-SW015
The YST-SW015 is a compact subwoofer with surprising power, excellent bass dispersion characteristics, and the fine sound quality you expect from Yamaha. It incorporates two of the same technologies as Yamahas top-line subwoofers: Advanced YST and QD-Bass. It also offers a Bass Action Selection System, phase control, and other useful functions. Ideal for both home theater and audio systems, as a main or second subwoofer, the YST-SW015 provides excellent value. and excellent bass!
o The YST-SW015 is also offered with black, cherry and silver finishes in some areas.
Powerful, Multi-Directional Bass Output Adds Extra Impact and Realism to Movies and Music

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QD-Bass and Advanced YST Are Just Two of the Many Reasons Why This Subwoofer Is a Great Choice for Any Home Theater or Audio System.
Fits-anywhere design QD-Bass (Quatre Dispersion Bass) technology Advanced YST (Yamaha Active Servo Technology) BASS (Bass Action Selection System)
Why Do You Need a Subwoofer? Now that most audio and video are in digital formats, the demands on speaker systems are greater than ever. Home theater systems use high-performance DVD players that bring you the benefits of advanced sound processing formats like Dolby Digital and DTS Digital Surround for movies and DVDAudio and SACD for music. However, full enjoyment of these digital sources requires deep, clear bass response, because 6.1 and 5.1 channel systems dedicate one channel to the bass frequencies. This means you need a subwoofer, and the better quality it is, the better your movies and music will sound. Many people think, Subwoofers are big and heavy. I dont have the space for one. But not the YST-SW015. Its a compact little cube that will fit neatly in any small space. And thanks to its QD-Bass system, the bass sound radiates to all parts of the room no matter where it is located.

Subwoofer

o The YST-SW015 is also offered with cherry, black and silver finishes in some areas.

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Fits-anywhere Design The YST-SW015 is a compact cube about 30cm on a side, small enough to fit in spaces where normal subwoofers cant go. This eliminates one of the major problems people generally associate with subwoofers. Yet even with this small size, power and quality are not compromised, thanks to Yamaha QD-Bass and YST technologies. QD-Bass Technology Allows Free Placement 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 Technology QD-Bass reduces turbulence
caused by reflection from the legs. Changing the height of the square pyramid varies the acoustic load, permitting relatively simple 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. Advanced YST for Awesome Deep Bass Yamahas patented Advanced Active Servo Technology (Advanced YST) generates incredible bass from small speaker enclosures. Advanced YST is the ideal method of combining amplifiers and speakers for maximum performance. This systems advanced negative impedance converters intelligently adjust the negative impedance generation as the speaker moves, creating a hard, rigid cone that prevents deep resonant waves from leaking out of the speaker cone. This means the full power of the waves is forced out through the air port, resulting in clear, powerful bass. BASS Function The BASS (Bass Action Selection System) function lets you switch between Movie and Music modes, providing the optimum frequency response in each case.
Advanced YST Brings You Super Bass.
The effectiveness of Advanced YST (Yamaha Active Servo Technology) 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 movement of the speaker unit would become linear with respect to signal voltage. To achieve this, a special negativeimpedance 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 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 impedance variation. With these new circuits, Advanced Yamaha Active Servo Technology provides more stable performance and higher sound pressure levels than the former system, resulting in more natural and energetic bass reproduction.

High-Amplitude Bass Sound Port
Air Woofer (Helmholtz Resonator) Cabinet
Advanced NegativeImpedance Converter
Active Servo Processing Amplifier

Signals

Signals of Low Amplitude

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YST-SW015 Notable Features
QD-Bass (Quatre Dispersion Bass) technology Advanced YST (Yamaha Active Servo Technology) BASS (Bass Action Selection System) 16cm (6-1/2) multi-range driver with magnetic shielding High 70 W output power Low (30200 Hz) frequency response 2-way binding-post speaker terminals (banana-plug compatible) Auto Standby with sensitivity selector Phase control (normal or reverse) High cut filter switch Low (0.8W) standby power consumption
YST-SW015 Main Specifications
Output Power Input Sensitivity [INPUT (PJ)] Input Impedance [INPUT (PJ)] Frequency Response High Cut Filter Driver Standby Power Consumption Dimensions (W x H x D) Weight 70 W (5 ohms) 30 mV (100 Hz, 70 W/5 ohms, L+R) 12 k-ohms 30200 Hz 16cm (6-1/2) multi-range driver 0.8 W 280 x 325 x 320 mm 11 x 12-13/16 x 12-5/8 9.2 kg; 20.3 lbs.
For details please contact:
Dolby Digital and Double D are trademarks of Dolby Laboratories Corporation. DTS, ES and DTS Digital Surround are trademarks of Digital Theater Systems, Inc. Product designs and specifications are subject to change without notice.
Visit us at our website: http://www.yamaha.co.jp/

YAMAHA CORPORATION

P.O. Box 1, Hamamatsu, Japan

APB650U-YSTSW015@Y20

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