Three classic EQ sounds direct from their vintage amp circuits...add Blackface, High wattage Tweed and British "stack" EQ to your current amplifier rig! This EQ sounds magical with simple amplifiers that have only a volume, or Volume and a single tone control. The Barb E.Q is a high headroom classic EQ that adds no overdrive to your signal yet imparts the famous "sound prints" of classic amplifiers. The Barber Barb E.Q. uses a high voltage internal supply, makes 9 volts into 24 volts for superior headroom.