Versatile Power Amplifier with Built-in PA Processing Yamaha’s PX8 dual-channel Class D power amplifier gives you more than great-sounding amplification. It packs powerful built-in processing that would normally require an external PA management processing. We’re talking onboard equalization for fine-tuning outputs, crossovers for integrating subs and fills, delays for correcting phase issues in large rigs, and a speaker-saving limiter. Factor in stellar sound quality, easy control via the LCD display, and its ultra-light weight, and it’s clear the Yamaha PX8 stands out among power amps in its class.