YSS906 데이터 시트보기 (PDF) - Yamaha Corporation

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YSS906

ASR2P Analog Surround

Yamaha Corporation 

YSS906

REFERENTIAL INFORMATION FOR CREATING SOUNDS

1. Wide Surround effect

The characteristic of Wide Surround is determined by two types of capacitors, C1 and C2 (standard capacitors of

0.022 mF and 0.018 mF) that decide the response of the filter and a resistor (fixed or variable) that decides the

amount of crosstalk. An equivalent circuit of “Wide Surround” function is as shown below.

FOL

Filter

FCL

C2

Fixed resistor

Pre-set

WL

resistor

Z =17 k

Variable resistor

10k

1/2VDD

The resistance determines the attenuation in amplitude of the signal outputted from FOL before it is inputted to

WL. Smaller resistance make the effect of Wide Surround higher. The resistance of “0(zero)” makes the amount

of the crosstalk equal to the one obtained at maximum value of the variable resistor. The amount of the crosstalk

can be determined based on the specific taste of the customer. However, higher crosstalk makes the amplitude of

the out-phase component larger, thus the crosstalk higher than a certain level may make the sound unpleasant. It

is recommended to set the crosstalk level in the range from -3 dB to -10 dB with respect to its maximum value.

Two types of capacitors, C1 and C2 (see above diagram) determine the cutoff frequency of the filter. The cutoff

frequency is decreased by reducing the capacitance while maintaining the ratio C1/C2 nearly constant. Higher

cutoff frequency of the filter makes the sound brighter. Recommended combinations of the capacitors, C1 and

C2 are as follows.

1. 0.022 mF and 0.018 mF (standard)

2. 0.018 mF and 0.015 mF

3. 0.015 mF and 0.012 mF

4. 0.012 mF and 0.010 mF

5. 0.010 mF and 8200 pF

6. 8200 pF and 6800 pF

7. 6800 pF and 5600 pF (lower limit)

Wide surround

effects

Frequency

13 5 7

capacitance combination number

Use any of the above combinations so that a favorite tone is obtained.

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