So I'm on site now. 26 speakers. No volume controls that I can find. Checked voltage and amperage on the 70 and the 25. Volume turned all the way down on the amp, 1 kHz test tone. 70: 24.8 v 1.18 amps for 29.3 watts. 25v: 10.5 volts .4 amps for 22 watts.
Still waiting for the amp to heat up to see if the problem occurs again.
