with AC205 transformer box has a rating of 25 volts. What does this mean and what amplifier should be used?
Commercial sound amplifiers including the Peavey, TOA, EV, and Bogan brands have transformer isolated speaker output taps including common terminal, 8 ohm tap, 25 volt tap, 70 volt tap, 100 volt tap (Europe). The AC205 was designed to connect to the low voltage 25 volt/common tap only, of amplifiers rated from 37.5 watts up to 300 watts (depending on how many speakers are to be connected in parallel to these terminals). Allow at least 37.5 watts of power consumption for each AC205 and LL916 connected to the 25 volt & common terminals. Following are some examples of multiple LL916/AC205 boxes connected in parallel to the 25 volt speaker terminals, and the required amplifier power/impedance: 1/37.5W/16 ohms; 2/75W/8 ohms; 4/150W/4 ohms; 8/300W/2 ohms. In every case cited previously, the AC205 steps the 25 volt line down to 20 volts on each speaker cable. This is well under the 30 volt rms international legal limit.