This mixer is designed to run all night into brutally low impedances and sound clean even when driven hard. Mackie starts with a massive toroid transformer and 2 unusually large storage capacitors with 720 joules of energy storage capacity. In fact, the PPM power supply is so robust that it can run on as little as 80 volts at the end of a long, skinny extension cord during a brown-out. Then they add their Fast Recovery circuitry that reduces latching distortion so PPM Series mixers sound good even when driven well into clipping. Also included is an SCR crowbar circuit for speaker protection.
