Yamaha NS-SW210 - Инструкция по эксплуатации - Страница 8

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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.

Refer to the chart below if this unit does not function properly. If the problem you are experiencing is not listed below, or 
if the instructions given below do not help, disconnect the power cord and contact an authorized YAMAHA dealer or 
service center.

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

TROUBLESHOOTING

Problem

Cause

What to Do

Power is not supplied even though the 
POWER switch is set to the ON 
position.

The power plug is not securely 
connected. 

Connect it securely.

No sound.

The volume is set to minimum.

Raise the volume up.

Speaker cables are not connected 
securely.

Connect them securely.

Sound level is too low.

A source sound with little bass 
frequency content is being played.

Play a source sound with bass 
frequencies.

It is influenced by standing waves.

Reposition the subwoofer or break up 
parallel surfaces by placing bookshelves, 
etc., along the walls.