Royer Labs R-dB20 dBooster Class-A In-Line Microphone Signal Booster

Boost the level of any dynamic or ribbon mic without adding noise with the Royer R-dB20 dBooster, a Class-A in-line gain booster with a crystal-clear sound.

The Royer 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 professional 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 circuitry presents a high source impedance to the microphone, which minimizes loading (damping). This reduces coloration and distortion while at the same time improving headroom.

By utilizing the 12/20dB gain switch, optimum balance between gain and headroom can be achieved for a variety of uses.

The low-impedance output of the dBooster 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.

The dBooster has two gain settings, 12 dB and 20 dB, allowing you to dial in just the right amount of in-line gain for your different singers and instruments. The 20 dB setting gives loads of clean boost for recording soft instruments and singers, but when your singer is wailing or you use the dBooster on high volume instruments like electric guitar, switch it down to 12 dB to keep from overloading your preamp or digital interface.

The dBooster's Class A input stage delivers crystal clean gain with virtually no noise or self-distortion. read more

The dBooster's low-impedance output keeps things clean in the studio and also shines on live stages, driving long cable lengths and difficult loads like mic splitters and vintage-style preamps with no loss of gain, no increased distortion, and excellent headroom.

The dBooster gives excellent results with Royer R-121s, R-10s and stereo SF-12s. It also smokes on SM7s and other dynamic mics!


- 12dB and 20dB gain stages
- High input impedance
- 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
- 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
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- Gain: 12dB or 20dB switchable
- 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: 3.6 KOhm
- 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)
- Power: 48-Volt phantom
- Dimensions: 3.62" (92mm) L X 2.0" (51mm) W X 1.62" (41.3mm) W
- Weight: 6 oz (170g)
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 0.5 lbs
Shipping Dimensions: 5 x 3 x 2 in
Manufacturer Part Number (MPN): R-dB20

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


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