Yamaha NS-SW210 - Manual (Page 8)

4
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.
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.