CEntrance MixerFace R4 User manual

MixerFace™ and CEntrance™ are trademarks or registered
trademarks of CEntrance LLC, All rights reserved. Other trademarks
are property of their respective holders. Rev 8.3. 2018-08-02
MixerFace R4
Mobile Recording Interface
User Manual

MixerFace R4 User Manual
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Recording Studio, in Your Hand
These days, your smartphone or tablet is not
only your Digital Audio Workstation, but also
your means of sharing content with the world
online. MixerFace R4 takes advantage of this
environment by connecting your audio
sources with the digital ecosystem, making it
the ultimate mobile recording interface.
Modern location audio professionals demand
rechargeable batteries and field reliability.
Production crews, musicians, online
personalities, and field recording enthusiasts
alike share a need for a durable, portable
recording tool that delivers pristine audio
quality, available on-the-go, session after
session. MixerFace R4 is a modern,
sophisticated piece of recording equipment,
which allows you to create pro-level content
in any location.

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Table of Contents
FEATURES AT A GLANCE.........................3
TOP PANEL CONTROLS............................7
FRONT PANEL FEATURES......................16
BACK PANEL FEATURES........................18
TROUBLESHOOTING STEPS ..................26

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Features at a Glance
One of the most impressive features of
MixerFace R4 lies in its digital technology,
which connects the built-in pristine analog
preamplifiers to your phone and tablet’s
audio capturing app(s) for recording and
playback. While your phone or tablet
replaces the laptop, MixerFace R4 places the
entire production studio in the palm of your
hand.
Top Panel Adjustments
MixerFace lives up to its name—it’s part
audio mixer, part recording interface. The top
panel looks like a familiar music mixer,
offering an easy way to adjust signal and
monitoring levels. The controls are laid out
logically, making sure all audio adjustments
are right at your fingertips.

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Connectivity Options
Despite R4’s small footprint, its front and
back panels pack multiple connectors for
inputs and outputs. R4’s strength is in its
extensive connectivity options. There are a
total of four analog inputs and six analog
outputs, which allow routing your audio to
headphones, monitors, and line-level
devices. Digital input/output over micro USB
allows easy connections to computers,
tablets and smartphones.
Preamps and A/D Converters
Don’t let the small size fool you! MixerFace
R4 includes two boutique microphone
preamplifiers with custom Jasmine™
technology, which delivers clean, velvety-
smooth sound with the lowest noise and
distortion. It uses professional A/D and D/A
converters, which operate at sampling rates

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of up to 192kHz, and resolutions up to 24-bit,
meeting the most demanding needs of
today’s content producers.
Phantom Power
MixerFace R4 offers +48V phantom power on
channels 1 & 2, enabling you to use
professional condenser microphones. Unlike
other devices, it offers true +48V, which
means you can use it with any condenser
microphone in your mic locker. This feature
was previously found only in studio-level
products, but now MixerFace R4 makes it
available in a mobile package.
Signal Level LEDs
To ensure high-quality, distortion-free
recording, each channel features bright “SIG”
and “PK” LED indicators for monitoring
incoming signal strength. White LEDs

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indicate signal present (“SIG”) and Red LEDs
indicate overload or peak (“PK”).
• White LEDs turn on when the input
signal level is 40dB below clipping.
• Red LEDs turn on when the signal is
6dB below clipping.
• Once triggered, all LEDs remain on for
a little while to make sure you notice
them.

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Top Panel Controls
Top panel controls, as described below

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Channel Switches
All switches are active when the lever is
moved to the right. The levers are recessed
to prevent accidental adjustment. Use a thin,
sharp object, such as a paperclip, toothpick
or a pen tip to slide the lever to the right to
activate the feature.
Channel switches and the GAIN knob

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LINE / Hi-Z switch
These switches select between line input and
electric guitar (“Hi-Z”) input on the ¼” portion
of the Neutrik combo jack, per channel.
MixerFace R4 includes two professional,
electric guitar preamplifiers with high
impedance (“Hi-Z”) inputs. This means you
can connect MixerFace R4 directly to electric
guitar and bass to record anywhere.
Recording two different instruments or
signals is possible. For example, connect a
Microphone to Channel 1 and Guitar to
Channel 2, or record Guitar on one channel
and mono keyboard on the other. Each
channel works independently of the other,
offering diverse possibilities for recording.
Hi-Z switch operation is described below: