amplifier module the Phonitor 2 is expanded with three additional loudspeaker outputs, making it the perfect analog 120V monitor controller. It allows you to listen to three user-definable analog stereo signals with headphones or up to four stereo speaker pairs all with the best-possible quality. Plus, the comprehensive controller functions of the Phonitor 2 (LR phase reverse, LR Solo, Mono, Mute) are readily available for use with all connected playback systems.