Royer Labs Dbooster by Millionhead in-Line Signal Booster

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 distribution or coloration. Designed for Professional Applications, The Dbooster Provides Two Levels of Clean Gain Boost; 12db and20dB, Selectable by A Front Panel Switch. The Dbooster Maintains Headroom and Gainregardless of Load. The Class a Input Circuitry Presents a High Source Impedance to the Microphone, Which Minimizes Loading (Damping). This Reduces Collection and Distortion W. By Utiilizing The 12/20DB Gain Switch, Optimum Balance Between Gain and Headroom Can Be Achieved for a Variety of uses.features12DB Gain Stagements Impedancelow Output Imped Case CeNstrucy Ow Noise Performanceultra-Low Distortionwide Frequency Bandwidthspecificationsgain: 12DB or 20DB Switchablefrequency Reponse : 20Hz-20kHz +/- .25dBInput Impedance : 3.6K-OhmOutput Impedance : (at 20dB setting) 300-OhmsCurrent draw : approximately 5mA at zero signal and 7.5mAat full outputInput and output connections : Balanced XLR: (Pin 1 Ground, Pin 2 Signalhot, Pin 3 Signal Cold) Power: 48-Volt Phantomdimensions: 3.62 "(92mm) L x 2.0" (51mm) W x 1.62 "(41.3mm) WWEIGHT: 6 Oz (170g) Self-noise: Reemerd to -48DB RE. 1V/PA, 20DB Setting <11DBA, 12DB Setting <15DBAHEADROOM: Referred to -48DB RE. 1V/PA and 4MV/PA, 20DB Setting: 127DB, 12DB Setting: 120DBSELF -Noise: Referred to -48DB RE. 1V/PA, 20DB Setting <11DBA, 12DB Setting <15DBathd+N:@ 20db Gain = .0015%, -25dbu Input Signal, 1.3VP -P Output Signal@ 12db Gain = .001%, -6DBU, 3.666VP -P output Signalim Distortion: @ 20DB Setting, <.002% @ 800MV Output, @ 12DB Setting, <.005% @ 2.6Volts Output