Royer Labs R-dB22 dBooster2 Class-A In-Line Microphone Signal Booster

Boost gain across two channels without adding noise with the Royer R-dB22 dBooster2, an in-line gain booster that works equally well for mics or guitars.

The Royer 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.


- 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 read more 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
- Recommended Applications:
- 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
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- Gain: switchable 12dB or 20dB in Mic mode, switchable 0dB or 8dB in DI mode
- THD+N:
- @ 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
- Self-Noise: referred to -48dB re. 1V/Pa
- 20dB setting < 11dBa,
- 12dB setting < 15dBa
- Headroom: 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) 1/4-inch unbalanced, tip signal HOT.
- Power: 48-Volt phantom
- Dimensions: 3.875" (98.425mm) L X 3.875" (98.435mm) W X 1.75" (44.45mm) H
- Weight: 10.2 oz (289g)
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 0.9 lbs
Shipping Dimensions: 7 x 6 x 4 in
Manufacturer Part Number (MPN): R-DB22

For support or warranty questions, please contact the manufacturer:
Phone: 818-847-0121


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