Soundboard amplifiers were sold by The High Cliff Company in Elgin, Illinois from around 1998 onwards The Soundboard Amplifier uses a driver system to transfer string vibrations to a real spruce soundboard, in an attempt to produce the same acoustic sound as a guitar. . Soundboard Amps were made in the U.S.A. Designed by master luthier Bruce Petros, each cabinet was hand assembled. High Cliff also sold Fingerboard Oil, Miracle Finish Restorer and Instrument Polish

Source: Soundboard amplifiers website (archived 2000)