Bedienungsanleitung Yamaha NS-SW300 Subwoofer

Bedienungsanleitung

1 En

In 1988, Yamaha brought to the marketplace speaker systems utilizing YST (Yamaha

Active Servo Technology) to give powerful, high quality bass reproduction. This technique

uses a direct connection between the amplifier and speaker, allowing accurate signal

transmission and precise speaker control.

As this technology uses speaker units controlled by the negative impedance drive of the

amplifier and resonance generated between the speaker cabinet volume and port, it creates

more resonant energy (the “air woofer” concept) than the standard bass reflex method. This

allows for bass reproduction from much smaller cabinets than was previously possible.

Yamaha’s newly developed Advanced YST II adds many refinements to Yamaha Active

Servo Technology, allowing better control of the forces driving the amplifier and speaker.

From the amplifier’s point of view, the speaker impedance changes depending on the sound

frequency. Yamaha developed a new circuit design combining negative-impedance and

constant-current drives, which provides a more stable performance and clear bass

reproduction, without any murkiness.

Today’s bass reflex speakers use a Helmholtz resonator to improve their bass reproduction.

However when reproducing bass that is in the frequency region of this Helmholtz

resonator, air moves violently in and out through the port between the interior and exterior

of the speaker, sometimes producing noise due to the turbulent air flow at the end of the

port.

The port and the cabinet resonate at a frequency that is determined by their dimensions and

shape. On the other hand, turbulence in the air flow at the end of the port contains a broad

range of frequency components that are not present in the input signal. This noise occurs

because the broad range of frequency components includes components that match the

resonant frequencies of the port and cabinet, causing strong resonance.

The Twisted Flare Port developed by Yamaha changes the way in which the port widens

toward its end, and also adds a “twist” to suppress airflow turbulence at each end of the port

and thus prevent noise from occurring.

This eliminates the “muddy sound” and “wind noise” that until now have been

characteristic of bass reflex speakers, allowing bass to be reproduced clearly.

ADVANCED YAMAHA ACTIVE SERVO TECHNOLOGY II

High-

amplitude

bass sound

Port

Cabinet

Advanced impedance

Converter

Active Servo

Processing

Amplifier

Signals of low amplitude

Air woofer

(Helmholtz resonator)

Signals

Twisted Flare Port

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