Electro-Voice ZLX-12 & ZLX-15P Power Supply Repair & Test - 647 watts RMS.

Electro-Voice ZLX 12 & ZLX-15P Power Supply Repair & Test. If you can get the max voltage +/-36 volts into the woofer, you are looking at 647 watts RMS. The repair scope shot shows +/- 30 volts peak to peak before it limits down to 20 volts PP. 30 volts PP times 2 = 60 volts PP. 60 x 0.707 = 42.42 42.42 x 42.42 = 1,799.4564 1,799.4564 into 4 ohms = 449.8641 RMS At full power, this 449 watts lasted just a few seconds before the chip cut the output down to 200 watts approx. There is no smoothing on the mains, so 240 volts not 320v. Oh, I drew the fet wrong too. The fet driver is is a UC3845B. After doing this video, I saw another blown ZLX-15P here on YouTube, it was the later board and had blown up. So later boards are as reliable as early boards.