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MixerFace R4R
Service Manual
42 pgs1.39 Mb1

CEntrance MixerFace R4, MixerFace R4R Service Manual

MixerFace R4 / R4R
Mobile Recording Interface
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 9.2. 2019-10-27
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
RECORDER FUNCTIONS .........................26
TROUBLESHOOTING STEPS ..................39
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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, velvety­smooth 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:
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• Slide the lever to the left to engage the “Line” position. Hi-Z input is disconnected and input gain is reduced to accommodate line-level sources on the ¼” jacks.
• Slide the lever to the right to engage the “Hi-Z” feature per channel. Ideal for connecting electric guitar and bass.
Low Cut Switch (HPF)
To simplify recording in noisy environments and reduce wind or mic handling noise in outdoor recordings, low cut switches are available on each input channel. By design, the low frequency rumble is cut early – right at the input jack, long before the mic preamp has a chance to overload and ruin your take. The switches are labeled HPF, short for
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“High Pass Filter”, which is a more appropriate name, if you want to get technical about it. The 6dB/octave cut is below 130Hz.
GAIN Control
MixerFace preamplifiers have a wide gain adjustment range of over 55dB. This covers a variety of applications – from on-the-mic narration, to recording nature sounds from a distance, using X-Y stereo microphones. The two gain controls let you adjust the levels of the individual input channels for minimum noise and distortion. A common guideline when adjusting input levels is to let the red “peak” LED blink occasionally, but not stay illuminated all the time. The white “signal present” LED is useful to check signal level during quieter packages.
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Signal Peak & Present LEDs
The White LED labeled “SIG” illuminates to indicate “signal present”. This happens when the audio level at the input of the A/D converter reaches -40dB. The white LED stays illuminated until the signal drops below the -40dB threshold.
The Red LED labeled “PK” illuminates to indicate “signal peak”. This happens when the audio level at the input of the A/D converter reaches -6dB. The red LED stays illuminated until the signal drops below the – 6dB threshold.
As these bright, sunlight-visible lights blink with the audio, they attract attention, offering a simple way to see signal levels at a glance, and make gain adjustments as necessary.
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