(Description from instruction manual) - "The RX20 Exciter/Imager/Hush II is a professional pschoacoustic processor which enables the user to add brightness, clarity, definition and intelligibility to audio signals. The inclusion of Rocktron's Hush II noise reduction insures that the. RX20 is the quietest psychoacoustic enhancement device available. The RX20 provides greater user control than other exciter type devices, with outstanding performance features. The RX20 has countless applications for studio, live use, home, broadcast, telecommunications, tape duplication, and more."

This unit has been in a smoke free, air conditioned recording studio since purchasing it new in 1990 and is available with the original instruction manual .