ITC T-106 ceiling speaker designed for a 100V constant-voltage PA (public address) system.
Key parts labeled:
100V Line Transformer – mounted on the back of the speaker. It allows the speaker to be connected to a 100V distributed audio system.
Transformer Primary (100V input):
Red = 100V+
Black = COM (common)
Speaker/Transformer Secondary Wiring – connects the transformer to the speaker driver.
Power Tap Selection – determines how much power the speaker draws from the 100V line:
6W
3W
1.5W
COM
Lower wattage = lower volume and higher impedance.
Transformer Control Wires – additional wires that may connect to an amplifier or control system depending on the installation.
Spring Clips (3x) – used to secure the speaker into a ceiling tile or ceiling cutout.
Product Label – shows model information and the power tap table.