Inspired by the famous song, Moonriver Audio is a combination of the vintage and the contemporary in audio reproduction.  Classic, timeless, user oriented design. Organic texture acquired within an open space, dynamic behavior unrestrained while preserving natural color, provisions made for modular upgrades and direct access to all functions.

PS Audio is an American company specializing in high-fidelity audio components (also known as high-end audio) equipment for audiophiles and the sound recording industry. It currently produces audio amplifiers, preamplifiers, power related products, digital-to-analog converters, streaming audio, music management software and cables.

Unison Research was founded in 1987 by a small group of audiophile enthusiasts led by Giovanni Maria Sacchetti, an accomplished pianist with a deep understanding and passion for music. In these early days Unison Research produced a variety of unique amplifiers, but the constant search for improvements in sound quality led them to focus on integrated designs. Their belief was that an integrated amplifier brought not just convenience, but also the potential for better sound quality by linking the pre- and power-amplifier stages inside one device, rather than using external cables.