The Klipsch ProMedia 2.1 THX speakers with subwoofer and volume control system are a high-quality portable speaker system designed for use with laptops, desktops, and other electronic devices. With a sleek black cube design and wire connectivity, this system includes two satellites, a subwoofer, and a volume control unit for customizable sound levels. The THX surround sound formats ensure an immersive audio experience, making it ideal for home entertainment or gaming setups. Compatible with various devices, this Klipsch speaker system delivers powerful and clear sound for a superior listening experience.Tested functions great, sub is VERY strong volume control knob is “touchy” ~ meaning when you adjust the sound dial you sometimes get some crackling ( common with older audio equipment )