Advanced yamaha active servo technology ii – Yamaha NS-SW700 User Manual

Page 18

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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.

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

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