Bedienungsanleitung Yamaha MusicCast SUB100 - NS-NSW100 (Seite 7 von 22) (Englisch)

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FEATURES

7 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 substantially reduces 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

Twisted Flare Port

High-amplitude

heavy bass sound

Port

Cabinet

Advanced impedance

Converter

Active Servo

Processing

Amplifier

(Inaudible) signals of ultra-low amplitude

Air woofer

(Helmholtz resonator)

Signals

Bass sound

(audible sound

pressure radiated

from diaphragm)

Conventional Port

Air turbulence on both ends of the port creates noise

Air turbulence is

produced.

Turbulence is

diffused, air flow

becomes smooth.

Twisted Flare Port

FEATURES

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Yamaha MusicCast SUB100 - NS-NSW100 Seite 7

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