Resonator mandolin

A resonator mandolin or "resophonic mandolin" is a mandolin whose sound is produced by one or more metal cones (resonators) instead of the customary wooden soundboard (mandolin top/face). These instruments are sometimes referred to as "Dobro mandolins," after pioneering instruments designed and produced by the Dopyera Brothers, which evolved into a brand name. The trademark "Dobro" is currently the property of the Gibson Guitar Corporation. When Gibson acquired the trademark in 1993, they announced that they would defend their right to its exclusive use.

The resonator mandolin was developed in parallel with the resonator guitar. The resonator guitar was originally designed to be louder than conventional acoustic guitars. A resonator mandolin is generally somewhat louder than a standard wooden mandolin, and has a different tone quality and distinctive appearance.