Philips SM30 User Manual download pdf (Page 33)

31

12.2 Coupling Zone Relay Modules

When more than 1 Zone Relay Module is

used in a system, the inputs of the modules

may be linked together (ﬁg.12.2), so that the

same ampliﬁer(s) can feed up to 18

loudspeaker zones. This is done by making

short linking wires, ﬁtted with Mate-N-Lok

connector pins at each end. One end is

pushed into one of the centre row of

termination sockets in the ﬁrst ‘Input’ Mate-

N-Lok connector plug (I).

The other end is pushed into the

corresponding right row of termination

sockets in the second ‘Input’ Mate-N-Lok

connector plug (H), and if applicable also

connected to the third ‘input’ Mate-N-Lok

connector plug (G).

12.3 Multiple Ampliﬁer Conﬁgurations

In large systems, comprising many

loudspeakers, it may be necessary, because

the large amount of ampliﬁer power

required exceeds the power available, to use

extra power ampliﬁers. This can be done in

one of several different ways:

- Unlinked multiple modules.

Separate ampliﬁers may be used to feed each

Zone Relay Module. This enables each

ampliﬁer to be dedicated to 6 speciﬁc zones.

- Module input splitting

(ﬁg.12.3).

The Zone Relay Module provides the

possibility of connecting more ampliﬁers to

a single module, so that each ampliﬁer feeds

fewer loudspeaker zones. Three miniature

fuses, link the centre and left rows of sockets

of each of the Call, Music, and (common)

Ground sockets of the ampliﬁer input

connector (ﬁg.12.1).

If one of the fuses is removed, the ampliﬁer

connected to the corresponding (right)

socket will only feed sockets 1-4 of the LS

output connector.

Another ampliﬁer, connected to the

corresponding left socket, will then feed only

sockets 5 and 6 of the LS output connector.

Fig. 12.2 - Coupling zones

G

18

16

17

3

6

21

4

5

7

89

101112

I

3

2

1

4

LS GROUP

CALL

MUSIC

5

6

H

10

11

12

9

8

7

3

6

2

1

4

5

7

8

9

101112

14

13

15

3

6

21

4

5

78

9

101112

3

6

21

4

5

78

9

101112

3

6

2

1

4

5

7

8

9

101112

3

6

2

1

4

5

789

101112

GB/SM 30 user manual 5/26/98 10:18 AM Page 31

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