PX5 Power Amplifiers The versatile PX series power amplifiers lineup combines intelligent processing with high output power to meet the requirements of a vast range of sound reinforcement environments. 500W x 2 at 8Ω / 800W x 2 at 4Ω. 2x 500W at 8Ω 2x 800W at 4Ω Newly developed Class-D amplifier engine with a custom LSI Flexible onboard PEQ, crossover, filters, delay, and limiter functions Yamaha Speaker presets Utlities for safe and secure operation