New! Dunlop's quieter, smaller re-design of the Rockman Ace lineĆImproved headphones, circuitry, and gating action lets you hear your instrument's dynamic range and clarity to inspire you to "pick up your guitar and play." These high-quality, low-priced headphone amps offer built-in compression, volume control, and auxiliary stereo input/output. The Bass Ace offers selectable treble boost and mid boost to add to your sound. Runs on 9V battery or optional ECB05 power adapter.