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

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.

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

FEATURES

• 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

BENEFITS
• 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

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) ¼-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)

WARRANTY
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.