Power professional PA speakers with the ultra-efficient Ashly EcoTour 500.4, a 4-channel power amplifier that delivers up to 500W of power per channel (1000W bridged). The unit incorporates Ashly's proprietary ultra-efficient D-MAX amplifier technology for the cleanest and most reliable performance with lower power draw. The 500.4 can power a variety of speaker types including Lo-Z (2, 4, and 8 ohms) to Hi-Z (70 or 100V).