Proel ACDT90 User Manual
Page 11

CONSTANT VOLTAGE LINE
If you’re using a constant voltage line, connect either the 25V, 70, or
100V to the “+” side of the speaker system, and connect COM to “-“
side of the speaker (fig. 2 ref. 17).
• Speakers should have a transformer of the same voltage
developed by the amplifier.
• The speakers power sum should not exceed the amplifier
maximum output power.