Dolby Laboratories 737 Manuale Utente

Model 737 Soundtrack Loudness Meter - Leq(m) 

Cat. No. 448B Input Adapter Board

3-2

Figure 3-1 Cat. No. 448B Interface Adapter

The DA10 or DA20 feeds six Dolby Digital channels; the Cat. No. 150 supplies two. 
Since the DA10/20 output is unbalanced, the positive tags should be used and the negative 
tags grounded. To ensure that the auxiliary two-track input is used in matrix mode, the 
MAT and OPT logic lines should be paralleled together and fed from the CP65 logic. 
Additionally, the SR logic line should be permanently grounded to disable the 3 dB 
attenuation on L, R of the six-track input to ensure sufficient gain. 

Figure 3-2 Installation of Cat. No. 448B

Before mounting the Cat. No. 448B, ensure the jumpers LK1-4 are in the upper 
(1&3) position.

Connect the Cat. No. 448B with the cinema processor using Table 3-2 and 
adhere to the pin conventions in Table 3-3 and Table 3-4.

Lt

Rt

GND

Lt

Rt

OPT MAT SR

+15 -15

0V

CAT150

TO DS4E

L+

L-

C+

C-

R+

R-

Ls+

Ls-

Rs+ Rs-

Sw+ Sw-

FROM DA20 / MON BUSS

C+

L+

L-

TO MODEL 737

Ls+

R+

C-

R-

Rs+

Ls-

Rs-

Sw+ Sw-

R1

R2

R4

R5

R6

R7

R9

R1
0

R1
1

R1
2

R1
3

R1
4

R3

R8

FROM

SIG

SW
2

J3

J2

J1

R22

SW
1

SW
4

SW
3

IC1

R26
R20
R27

R25
R19
R24
R15
R17

R16

R18

R21

IC2

R23

D1

C3

C2 C5

C4

C1

RV2

RV1

LEFT

RIGHT

LK
1

LK
2

LK
3

LK
4

Lt, Rt
2 & 3

Lt, Rt
1 & 3
(LK1-4)

(LK1-4)

CAT. NO. 448B

R28

R29

INTERFACE ADAPTOR FOR MODEL 737
A2A7463 REV A

D A 1 0 /2 0

C a t.  N o.  4 4 8 B

C P 6 5

x2 (L t/R t - o pt)

x6 (u nbalanced)

M od e l  7 3 7