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$ 199 .00
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Royer Labs dBooster

Phantom-powered ribbon and dynamic microphone signal booster and impedance buffer

Product Description

The Royer R-DB20 dBooster 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; 12 dB and 20 dB, 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 12/20 dB 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.


  • 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


  • 12 dB and 20 dB 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


  • Gain: 12 dB or 20 dB switchable
  • THD+N: @ 20 dB Gain = .0015%, -25 dBu input signal,
  • 1.3Vp-p output signal; @ 12 dB Gain = .001%, -6Bu input signal,
  • 3.66Vp-p output signal
  • IM Distortion: @ 20 dB setting, <.002% @ 800 mV output,; @ 12 dB setting, <.005% @ 2.6 volts output
  • Self-noise: referred to -48 dB re 1V/pa, 20 dB setting <11 dBa, 12 dB setting <15 dBa
  • Headroom: referred to -48dB re 1V/pa and 4mV/pa, 20 dB setting: 127 dB, 12 dB setting: 120 dB
  • Frequency response: 20 Hz - 20 kHz ±0.25 dB
  • Input Impedance: 3.6K-Ohm
  • Output Impedance: (at 20 dB setting) 300 Ohms
  • Current draw: approximately 5 mA at zero signal and 7.5 mA 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” (92 mm) L X 2.0” (51 mm) W X 1.62” (41.3 mm) W
  • Weight: 6 oz (170 g)

Product Specifications

Condition New

Product Reviews

4.8 out of 5 stars.
Review Count (4)

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Royer Labs dBooster is an important tool to cleanly & efficiently boost signal, especially from Royer ribbons or the SM7b.

By SuperGravity F on June 27, 2023

Does exactly what it says it does; big improvement doing tape sync w/ the SM7b, haven't used it yet for music or with ribbons but I'll bet it's great!

By Brian J on May 29, 2021

Works great with my r84 ribbon.. having the selectable gain is a bonus since I don’t usually need 20db boost.. I haven’t compared other types but I’m happy with the sound.

By Michael B on May 9, 2021

Great with the Royer R-10 I purchased, great combo!

By Brad S on April 21, 2021

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Matthew R.
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Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
Phil T.
The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
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