4
OT-4240/4480/4960
OUTPUT TRANSFORMER UNIT
Rear Panel
Rear Panel
1. AMP INPUT TERMINALS
These terminals are connected to the output of a low-impedance amplifier like the Inter-M OT-4240
(4
Ω
/60W), OT-4480 (4
Ω
/120W) or OT-4960 (4
Ω
/240W).
2. SPEAKER OUTPUT TERMINALS
These output terminals may be connected with high-impedance distributed speaker systems.
For 120VAC operation, the 70V output terminal is recommended. For 230VAC operation, the 100V or 70V
terminals may be used.
The chart below shows recommended impedances.
100V
70V
25V
OT-4240 / 120VAC
81.7
Ω
10.4
Ω
OT-4240 / 230VAC
166.7
Ω
81.7
Ω
OT-4480 / 120VAC
40.8
Ω
5.2
Ω
OT-4480 / 230VAC
83.3
Ω
40.8
Ω
OT-4960 / 120VAC
20.4
Ω
OT-4960 / 230VAC
41.6
Ω
20.4
Ω
