Yamaha YST-SW225B

Powerful

Subwoofer with Advanced

Technology for Top-Class

Sound Quality.

Ideal Match for 225 Series

Speakers.

YST-SW225

Advanced YST II and QD-Base Subwoofer

䢇 QD-Bass (Quatre Dispersion Bass) Technology

䢇

Advanced YST II (Yamaha Active Servo

Technology II)

䢇 PWM Digital Drive High Efficiency Amplifier

䢇 Linear Port for Minimizing Extraneous Noise

䢇 150 W Dynamic Power

䢇 BASS (Bass Action Selector System)

䢇 20cm (8”) Multi-Range Driver with Magnetic

Shielding

䢇 28–200Hz Low Frequency Reproduction

䢇

Auto Standby with Sensitivity Selector

(HIGH, LOW and OFF)

䢇 Low (0.5W) Standby Power Consumption

P10014978W-YSTSW225@NPB_Birch

Main Specifications

Dynamic Power

Output Power

150 W

(5 ohms, 100Hz, 10% THD) 120 W

Frequency Response 28–200 Hz

High Cut Filter

(Continuously Variable) 40–140 Hz

Driver 20cm (8”) multi-range

Standby Power Consumption 0.5 W

Dimensions (W x H x D) 290 x 350 x 349 mm

11-7/16” x 13-3/4” x 13-3/4”

Weight 11.5 kg; 25.3 lbs.

YST-SW225

Subwoofer

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 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.

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.

New Linear Port

The Linear Port provides smooth bass response during palyback and minimizing extraneous noise.

PWM Digital Drive High Efficiency

Amplifier

The YST-SW225 delivers high power outputs at deep bass levels, with excellent stability and low power consumption, even with their compact cabinets. This is made possible by a highly efficient power amplifier.

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

Advanced YST II for Awesome Deep

Bass

Yamaha's newly developed Advanced

YST II (Yamaha Active

Servo Technology II) combines negativeimpedance and constant-current principles to drive the speaker cone with even tighter control than previously. Using

Advanced Negative Impedance

NS-225F

2-Way Acoustic

Suspension Tower

Speaker System

NS-M225

2-Way Acoustic Suspension

Speaker System

High-Amplitude

Bass Sound

Air Woofer

(Helmholtz Resonator)

Cabinet

Port

Advanced Negative-

Impedance Converter

Active

Servo

Processing

Amplifier

Signals

NS-C225

2-Way Acoustic

Suspension

Center Speaker

System

NEW PRODUCT BULLETIN 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.

BASS

The BASS (Bass Action Selector System) function lets you switch between Movie and Music modes, providing the optimum frequency response in each case.

Environmentally Friendly

Internal parts and circuit boards do not contain lead, which is often used in other subwoofer brands, and is harmful to the environment. Both models also have a low-power standby mode, in which power consumption is only 0.5W.

Other Notable Feafures

• 20cm (8”) Multi-Range Driver with

Magnetic Shielding

• 28–200Hz Low Frequency

Reproduction

• Auto Standby with Sensitivity Selector

(HIGH, LOW and OFF)

The YST-SW225 is designed to acoustically match the speakers in the 225 Series, and is recommended to be sold together with them.

Signals of Low Amplitude

• Product designs and specifications are subject to change without notice.