Toa BS-680FC - Manual (Page 3)

Step 3. Perform wiring.
3-1. Connect both the lead-in and lead-out cables to the terminal block attached to the cabinet.
[Applicable cable]
Step 4. Replace the baffle to the cabinet, then tighten 2 screws loosely attached on both sides of the cabinet.
3-2. Insert the fasten terminals fitted at the ends of the HOT, COM, and Earth (BS-680FC only) cables
from the input connector on the cabinet into the taps of the matching transformer on the speaker unit.
Connect the COM cable to the transformer's COM tap, the HOT cable to the desired transformer's
input tap, and the Earth cable (BS-680FC only) to the lug terminal at the transformer base. (Refer to
the figure below.)
The table below shows the relationship between impedance and input power.
Impedance 1.7 kΩ 3.3 kΩ 6.7 kΩ 13 kΩ
100 V line 6 W 3 W 1.5 W 0.8 W
70 V line 3 W 1.5 W 0.8 W 0.4 W
BS-680F Solid wire: ш0.8 – ш1.6 mm (AWG 20 – 14)
7-core twisted wire: 0.75 – 1.25 mm 2 (AWG 18 – 16)
BS-680FC Solid wire: ш1.0 – ш3.0 mm (AWG 18 – 9)
3.3kΩ
1.7kΩ
COM
6.7kΩ
13kΩ
3.3kΩ
1.7kΩ
COM
6.7kΩ
13kΩ
Cabinet
Input connector
Input connector
Thermal fuse
From the amplifier
To the next speaker
From the amplifier
Cabinet
Input connector To the next speaker
From the amplifier
From
the amplifier
To the next speaker
To the next speaker
COM
HOT
5 mm (0.2”)
COM
HOT
[Connection of the BS-680FC]
[Connection of the BS-680F]
COM (white)
HOT (black)
Matching transformer
(on the speaker unit)
Matching transformer
(on the speaker unit)
Input connector
HOT
COM
9 mm (0.35”)