Manufacture: Advanced class “D” amplifier with very solid power supply. High quality DAC board (option). Functionality: Modern and multi-way. Many settings in menu, board with digital inputs as option. Parameters: With current! Double the power when changing load form 8ohm to 4ohm, low noise -85dB, very low distortion. Sound: Dynamic, involving, with beautiful, strong, contour bass, clean middle, and selective treble.