Royer dBooster2 Two-channel In-line Signal Booster

Two-channel In-Line Signal Booster with DI’s



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SKU: ROYRDB22 Categories: , Tag Brand:


The Royer model R-DB22 dBooster2 features two channels of dBooster ribbon & dynamic microphone signal boosting and impedance buffering technology. Each channel also doubles as a high-impedance DI.

When used as a signal booster, both channels of the dBooster2 increase the level of passive low-output ribbon and dynamic microphones with a minimum of distortion or coloration. Designed for professional applications, each dBooster2 channel offers two levels of clean gain boost: 12dB or 20dB, selectable by a front panel switch.

The dBooster2’s Class A input presents a high source impedance to microphones, minimizing loading (damping) and improving headroom. By utilizing the 12/20dB gain switch, optimum balance between gain and headroom can be achieved for a variety of uses.

The dBooster2’s low-impedance output is an increased microphone-level signal that can drive a digital interface directly or a standard microphone preamplifier. It also minimizes signal loss on long cable runs.

When used as a DI for unbalanced guitar level sources, the dBooster2 provides either 0dB or 8dB of gain, selectable from the front panel switch. The single ended high-impedance (230K-Ohm) DI input maintains headroom and gain regardless of load, with minimal distortion or coloration.


  • Miking any low-volume sound source (acoustic instruments, vocals, etc.)
  • Recording direct to a DAW interface
  • Use on long cable runs to retain sound quality
  • DI for direct electric guitar, electric bass, and other instruments


  • 12dB and 20dB gain stages in Mic mode
  • 0dB or 8dB gain in Hi-Z guitar input mode
  • High input impedance
  • Balanced Low output impedance
  • Rugged case construction
  • Ultra-low noise performance
  • Ultra-low distortion
  • Wide frequency bandwidth


  • Safe for use on all ribbon mics
  • Increases headroom at the preamp
  • Provides true electrical isolation
  • Protects ribbon mics from phantom-power
  • Minimizes mic loading
  • Capable of driving difficult loads, such as mic splitters and vintage style preamps, without increased distortion or loss of gain



  • switchable 12dB or 20dB in Mic mode,
  • switchable 0dB or 8dB in DI mode


  • @ 20dB Gain = .0015%, -25dBu input signal, 1.3Vp-p output signal
  • @ 12dB Gain = .001%, -6dBu input signal, 3.66Vp-p output signal

IM Distortion:

  • @ 20dB setting, < .002% @ 800mV output,
  • @ 12dB setting, < .005% @ 2.6volts output


  • referred to -48dB re. 1V/Pa , 20dB setting < 11dBa, 12dB setting < 15dBa


  • referred to -48dB re. 1V/Pa and 4mV/Pa, 20dB setting: 127dB, 12dB setting: 120dB

Frequency Response:

  • 20Hz-20kHz +/- .25dB

Input Impedance:

  • 3.6K-Ohm in Mic mode, 270K-Ohm in DI mode

Output Impedance:

  • (at 20dB setting) 300-Ohms

Current draw:

  • approximately 5mA at zero signal and 7.5mA at full output

Input and output connections:

  • Balanced XLR: (Pin 1 Ground, Pin 2 Signal Hot, Pin 3 Signal Cold), HI-Z (DI) ¼-inch unbalanced, tip signal HOT.


  • 48-Volt phantom


  • 3.875” (98.425mm) L X 3.875” (98.435mm) W X 1.75” (44.45mm) H


  • 10.2 oz (289g)


The dBooster2 is covered by a one-year warranty. This warranty covers parts and labor but does not cover damage as a result of misuse or abuse.

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