Ashly NX4004 nX Multi-Mode Amplifiers feature energy-efficient Class-D switching amplifier technology combined with a switch mode power supply. All feature Selectable Outputs on each channel so you can connect to virtually any speaker: low impedance (2, 4, and 8-ohm), or constant voltage (70V or 100V). Offered in 2- and 4 Channels, nX is available in two and four-channel models with 3000, 1500, 800, 400, 150 and 75 Watts per channel.