The 907xl is a high-performance power amplifier for line-level stereo audio signals. It accepts a balanced stereo audio signal on a terminal block connector and an unbalanced stereo signal on RCA connectors. It delivers 40 watts per channel into an 8Ω load.- Controls - 1 volume control knob for each input & mute button.- Gain Control DIP-Switches.- High Efficiency - Class D operation.- Mute and On Indicator LEDs.- Compact MultiTOOLS® - Up to 4 units can be rack mounted side−by−side in a 1U rack space with the optional RK−1 universal rack adapter.