Royer R-DB20 dBooster - Inline Microphone Signal Booster (Needs Phantom Power)The Royer model R DB20 is a phantom powered ribbon and dynamic microphone signal booster and impedance buffer. It increases the level of passive low output ribbon and dynamic microphones with a minimum of distortion or coloration. Designed for profes sional applications, the dBooster provides two levels of clean gain boost; 12dB and 20dB, selectable by a front panel switch. The dBooster maintains headroom and gain regardless of load. The Class A input