Royer Labs R-DB22 - dBooster2 - In-Line Signal Booster & DI

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Royer Labs R-DB22 - dBooster2 - In-Line Signal Booster & DI


Royer Labs R-DB22 - dBooster2 - In-Line Signal Booster & DI

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

Technical Specifications


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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