Yamaha NS-P220 owner manual Advanced Yamaha Active Servo Technology for SW-P201

Page 16

ADVANCED YAMAHA ACTIVE SERVO TECHNOLOGY (for SW-P201)

The theory of Yamaha Active Servo Technology has been based upon two major factors, 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’s cabinet. This opening is used instead of, and performs the functions of, a woofer in a conventionally designed speaker system. Thus, signals of low amplitude within the cabinet can, according to the Helmholtz resonance theory, be outputted from this opening as waves of great amplitude if the size of the opening and the volume of the cabinet are in the correct proportion to satisfy a certain ratio.

In order to accomplish this, moreover, the amplitudes within the cabinet must be both precise and of sufficient power because these amplitudes must overcome the “load” presented by the air that exists within the cabinet.

Thus it is this problem that is resolved through the employment of a new design in which the amplifier supplies 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 accomplish this, a special negative-impedance output-drive amplifier for subtracting output impedance of the amplifier is used.

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. The system can, therefore, by employing the negative-impedance output drive amplifier and a speaker cabinet with the Helmholtz resonator, reproduce an extremely wide range of frequencies with amazing sound quality and less distortion.

The features described above, then, are combined to be the fundamental structure of the conventional Yamaha Active Servo Technology.

Our new Active Servo Technology — Advanced Yamaha Active Servo Technology — adopted Advanced Negative Impedance Converter (ANIC) circuits, which allows the conventional negative impedance converter to dynamically vary in order to select an optimum value for speaker impedance variation. With this new ANIC circuits, Advanced Yamaha Active Servo Technology can provide more stable performance and improved sound pressure compared with the conventional Yamaha Active Servo Technology, resulting in more natural and dynamic bass reproduction.

High-amplitude bass sound

 

 

Air woofer

Cabinet

 

(Helmholtz resonator)

Port

 

 

 

Advanced Negative-

 

 

impedance Converter

 

 

Active Servo

Signals

 

Processing

 

 

 

Amplifier

 

Signals of low amplitude

12

Page 15 Page 17
Image 16
Page 15 Page 17
Contents NS-P220 Safety Instructions We Want You Listening For a Lifetime FCC Information for US customers onlyUnpacking 15mFor Canadian Customers For U.K. and Europe models onlyComponents of the Package Subwoofer Rear L Main L CenterSubwoofer Main R Center Main L TV-set Rear R Rear L Mounting the main and center speakers To mount the speakers on the mounting brackets type aMounting the rear speakers Connections An example of basic connectionsPage Main/center/rear speakers How to ConnectSubwoofer INPUT1/OUTPUT terminals If your amplifier has two sets of speaker output terminals Controls and their functions Rear panelAdjusting the subwoofer before use Automatic power-switching functionAdvanced Yamaha Active Servo Technology for SW-P201 Problem Cause What to Do No sound Problem Cause What to Do Power is not supplied evenThough the Power switch is set Standby mode unexpectedlyNX-220P, NX-C220 WeightSW-P201 V742370-1
Top Page Image Contents