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Wiring diagrams – Toa BS-678BT User Manual

Page 3

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4. VOLUME ADJUSTMENT (BS-678T and BS-678BT)

Adjust the sound volume by rotating rotary switch on the speaker’s side panel.

Switch position

3

2

1

OFF

Sound volume

0 dB

– 6 dB – 12 dB

off

Note: Switch position is factory-preset to “ 3.”

O

FF

3

1

2

VOLUME CONTROL

8 Ω

13 kΩ

6.7 kΩ

3.3 kΩ

1.7 kΩ

0

COM (white)

Bridge

[ 2-wire system ]

HOT (black)

Matching
transformer

COM

Attenuator

HOT

(+)

R

(R)

(–)

SP

N

(N)

(C)

Input

connector

(R–C SHORT)

8 Ω

13 kΩ

6.7 kΩ

3.3 kΩ

1.7 kΩ

0

COM (white)

Bridge

COM

(COM)

(–)

HOT (black)

HOT

(HOT)

(+)

Matching
transformer

Input connector

COM

5. WIRING DIAGRAMS

5.1. BS-678 and BS-678B

5.2. BS-678T and BS-678BT

8 Ω

13 kΩ

6.7 kΩ

3.3 kΩ

1.7 kΩ

0

COM (white)

Bridge

[ 3-wire system ]

HOT (black)

Matching
transformer

COM

Attenuator

Normal

R

Common

Emergency

SP

N

(N)

(R)

(C)

Input connector

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