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Royer Labs mikrofon R-DB22

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Royer Labs
Professional Audio Products
dBooster2
dBooster2
dBooster2
dBooster2 dBooster2
Stereo in-line Microphone and DI (Direct Injection) Signal Booster
With the introduction of the original , low-output passive microphones could be boosted with up dBooster
to 20dB of clean signal boost and superior sound quality. The takes that concept to the next dBooster2
level.
The Royer model is a phantom powered two-channel in-line level booster/buer for passive low-R-DB22
output ribbon and dynamic microphones and incorporates a high-impedance Direct Injection input for
guitars and other Hi-Z sources.
An integrated combination input jack accommodates standard 3-Pin microphone XLR inputs and ¼-inch
high-impedance inputs. The dBooster2 is designed for professional applications and provides two levels
of clean boost in both the low-impedance microphone mode; 12dB or 20dB and the high-impedance mode;
0dB (unity) or 8dB, selectable by a front panel switch.
How to set up your dBooster2
NOTE: It is a good idea to make all of your connections before activating phantom power and turning up
your preamp level control!
One of the unique features of the is that each channel of this stereo unit is completely isolated dBooster2
from the other. They are completely independent. This minimizes the chance of ground loops developing
when used with stereophonic microphones or dierent independent channels of microphone preampliers
and interfaces.
The goes between any non-powered ribbon or dynamic mic, ¼ Hi-Z source and your preamp, dBooster2
DAW or audio interface. In the mic mode it will provide either 12dB or 20dB of signal boost for low-output
microphones. In the Hi-Z DI (direct injection) mode it will deliver unity gain (0-dB) or +8dB of gain. A
front panel switch establishes the gain setting.
When used for microphones, the microphone is connected to the INPUT of the via a standard dBooster2
3-conductor XLR microphone cable. In the DI mode the source is connected via a standard two-conductor
¼-inch guitar type cable. The
OUTPUT of the is dBooster2
connected to any preamplier, DAW
or interface that is enabled with
phantom power capability.
The is a mic-level device dBooster2
and not intended to drive line-level
inputs directly. After your
connections are made, apply
phantom-power, and slowly bring up
the preamp level to verify that the
microphone or DI input is passing
signal. To achieve the best
performance from your dBooster2
with minimal noise and distortion at
the preamp, use the lowest gain setting that will provide satisfactory results. The higher gain settings are
best for use with very low-output signal sources or low-gain preampliers.
Each application will vary based on the microphone, signal source and preamplier, so feel free to
experiment and familiarize yourself with the and its capabilities. If you have any questions dBooster2
regarding the use of this product you can always contact us by visiting our website: royerlabs.com
NOTE:
The will not work with phantom-powered condenser microphones because one of its features is dBooster2
to block phantom-power from being fed to the microphone. This is a safety feature designed to prevent
possible damage to ribbon microphones that are susceptible to damage as a result of being exposed to
phantom -power.
The combination input jack can be used with either a 3-Pin XLR connector or a ¼-inch guitar type
connector, but not both simultaneously. You can, however, use either channel in the “mic mode” and the
other “DI mode” simultaneously.
The is designed to work with stereophonic microphones without ground loops issues, channel 1 dBooster2
(left input) is connected to the chassis via Pin-1 of the XLR input, while channel 2 (right input) is connected
capacitively to Pin-1 of XLR connector. If you are using the dBooster2 as a monaural device (only one
channel), use channel 1 for best grounding performance in electrically noisy environments.
For microphones, Pin-2 is the in-phase signal and Pin-3 is the out-of-phase signal, with Pin-1 being
GROUND. In the Hi-Z mode the TIP is the signal HOT and the sleeve is signal GROUND.
Circuit Description
The is an electronically sophisticated device. For the microphone input mode, the dBooster2 dBooster2
design starts with a dierentially congured input stage consisting of multiple paralleled PNP
semiconductors for low noise performance. In the DI mode, a single-ended FET is congured for the input
buer. These semiconductor devices run in pure Class A for minimal distortion. The preamp uses a current
feedback mechanism and high-quality, thin-lm resistors to further keep noise and distortion low.
The output section utilizes a pair of operational ampliers that act as output buers and low impedance
line-drivers. The output stage enables the to drive diicult loads without sacricing gain or dBooster2
performance while maintaining excellent headroom. Circuit power is derived from a phantom-powered
source and is fully regulated and decoupled internally, providing clean voltage and current for optimum
circuit operation.
Warranty
The is covered by a one-year bumper to bumper warranty. This warranty covers parts and labor dBooster2
but does not cover damage as a result of misuse or abuse.
This product was designed and assembled in the U.S.A. from components and materials sourced globally.
Royer Labs
Burbank, CA
818.847.0121
royerlabs.com

Produktspecifikationer

Varumärke: Royer Labs
Kategori: mikrofon
Modell: R-DB22

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