The OT-4240/4480/4960 transformers the 4 ohm output of the QD-4240/4480/4960 to a 70V or 100V level for use with high impedance speakers.
Expansion line out for OT-4240/4480/4960
4 independent channels allow for 4 mono or 2 separate stereo zones.

OT-4240
OT-4480
OT-4960
Rated Output
70V(81.7ohm) 100V(166.7ohm)
70V(40.8ohm) 100V(83.3ohm)
70V(20.4ohm) 100V(41.6ohm)
Input
4ohm/60W
4ohm/120W
4ohm/240W
Frequency Response (+1,-3dB)
20Hz~20kHz
20Hz~20kHz
20Hz~20kHz
Weight
21lbs.
9.5kg
30lbs.
13.6kg
53lbs.
24kg
Dimensions
19(W) x 3.5(H) x 12.2(D) inches

482(W) x 88(H) x 310(D) mm
19(W) x 5.25(H) x 12.2(D) inches

482(W) x 132(H) x 310(D) mm

 

Owners Manual, Spec Sheet, Block Diagram, Drawing, and Large Scale Photo can be found here.