Yamaha NS-SW500 Owner's Manual download pdf (Page 10)

7 En

The figures below show the optimum adjustment of each

control and the frequency characteristics when the

subwoofer is combined with a typical front speaker system.

■ When combined with 10 cm (4") or 13 cm (5")

acoustic suspension, 2-way system front

speakers

■ When combined with 20 cm (8") or 25 cm (10")

acoustic suspension, 2-way system front

speakers

* This diagram does not depict actual frequency

response characteristics.

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.

Subwoofer frequency characteristics

20 50 100 200 500Hz

HIGH CUT 40 Hz

HIGH CUT 90 Hz

HIGH CUT 140 Hz

20 50 100 200 500Hz

PHASE

Frequency response graph*

(70 Hz) (REV)

Front

speaker

20 50 100 200 500Hz

Frequency response graph*

PHASE

Front

speaker

(50 Hz) (REV)

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

1 2 ... 5 6 7 8 9 10 11 12

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Yamaha NS-SW500 Owner's Manual Page 10

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