Panasonic SUA900D is a stereo control-power amplifier that combines a control amplifier and a power amplifier into one convenient unit. It features a variety of inputs and outputs, making it compatible with a wide range of audio components. The SUA900D also includes a number of features that enhance the sound quality of your music, such as tone controls, a balance control, and a muting function. Additionally, the SUA900D has a built-in headphone jack, allowing you to enjoy your music privately.