Yamaha SW-P270 Subwoofer with Active Servo Technology - Powered / Active

Give your sound system more body and impact with this compact powered / active sub by Yamaha.

In Excellent Condition. Dynamic Output Power: 100W (full specs below)

The SW-P270 is a subwoofer that features a built-in power amplifier. It utilizes Advanced YAMAHA Active Servo Technology to reproduce extremely high quality super-bass range sounds that add a rich, realistic dimension to your sound system.

YAMAHA Active Servo Technology
The theory behind YAMAHA Active Servo Technology is based on two 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 Helmholtz resonance theory, be output from this opening as waves of great amplitude if the size of the opening and the volume of the cabinet are in 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 in the cabinet. This problem is resolved by a 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, the system utilizes a special negative-impedance output-drive amplifier that subtracts the output impedance of the amplifier.

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 featuring a Helmholtz resonator, reproduce an extremely wide range of frequencies without standing sound quality and low distortion. The features described above combine to create the fundamental structure of conventional YAMAHA Active Servo Technology. Our new Active Servo Technology — Advanced YAMAHA Active Servo Technology — adopts Advanced Negative Impedance Converter (ANIC)circuits, which allow the conventional negative impedance converter to dynamically vary to select an optimum value for speaker impedance variation.With these new ANIC circuits, Advanced YAMAHA Active Servo Technology provides amore stable performance and improved sound pressure compared to conventional YAMAHA Active Servo Technology, resulting in more natural and dynamic bass reproduction

Specifications:

SW-P270

Type ... Advanced YAMAHA Active Servo Technology
Magnetically shielded type
Driver .........................16 cm (6-5/16") cone woofer
Output Power......... 50 W (100 Hz, 5ohms at THD=10%)at 50 W
Dynamic Power ....................................... 100 W, 5ohms
Input Impedance ... INPUT (1P RCA pin jack): 12 k
Frequency Response ................... 30 Hz – 200 Hz
Input Sensitivity ............ INPUT (1P RCA pin jack):100 mV (100 Hz, 5
Dimensions (W x H x D).............................. 200 mm x 365 mm x 370 mm(7-7/8" x 143-23/32" x 14-9/16")
Weight .......................................... 8.5 kg (18.7 lbs.)