Dolby Laboratories CP65 manual Desired

5-36

B-Chain Alignment Procedures

e. Surround Equalization Alignment (Cat. No. 441)

Step

Action

Indication

No.

6

Cat. No.

441

dB

signal

+10

present

tp

D I P

Subwoofer

on

cut

+5

auto

freq

Dolby

off

Q

n-sync

opt gain

surr

mag/dig

gain

gain

0

treble

Surround

cut

mid

freq

Q

–5

Left

bass

tp

treble

–10

cut

Surround

.05

.1

.2

.4

.8

1.6

3.15

6.3

12.5

kHz

mid

freq

Q

Right

bass

gain

gnd

signal

present

7

Cat. No.

441

dB

signal

+10

present

tp

Subwoofer

on

cut

+5

auto

freq

off

Q

Dolby

n-sync

opt gain

surr

mag/dig

gain

gain

0

treble

Surround

cut

mid

freq

–5

Left

Q

bass

tp

–10

treble

Surround

cut

.05

.1

.2

.4

.8

1.6

3.15

6.3

12.5

kHz

mid

freq

Q

Right

bass

gain

gnd

signal

present

8

Cat. No.

441

signal

dB

present

tp

+10

Subwoofer

on

cut

auto

freq

+5

off

Q

DESIRED

n-sync

opt gain

Dolby

RESPONSE

surr

mag/dig

gain

gain

treble

0

Surround

cut

mid

freq

Q

–5

Left

bass

tp

–10

treble

cut

.05

.1

.2

.4

.8

1.6

3.15

6.3

12.5

kHz

Surround

mid

freq

Q

Right

bass

gain

gnd

signal

present

9

REPEAT

6 → 8

5-37

B-Chain Alignment Procedures

e.Surround Equalization Alignment (Cat. No. 441) Notes

Turn the freq control so that the notch is located over the peak noted in the previous step.

Adjust the Cut and Q controls for the flattest response in this part of the spectrum.

Adjust the treble control on the Cat. No. 441 card for the best approximation to the desired response shown.

The treble and mid equalizer controls interact. Repeat the adjustments until no further adjustment is required and you have attained the optimum frequency response.