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RedNet MP8R
Data Sheet
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User's Guide
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Focusrite Pro RedNet MP8R User's Guide

User Guide
ON
FFFA001146-04
www.focusrite.com
CONTENTS
About this User Guide .........................................................3
Box Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INTRODUCTION ................................................................4
Gain Compensated Split Outputs ................................................5
INSTALLATION GUIDE ...........................................................6
RedNet MP8R Connections and Features ........................................6
Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Physical Characteristics ......................................................10
Power Requirements.........................................................10
REDNET MP8R OPERATION .....................................................11
First Use and Firmware Updates ...............................................11
Digital Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pull Up and Pull Down Operation...............................................11
Front Panel Control Lockout...................................................11
Gain Compensated Outputs .......... . . . . . . . . ............. . . . . . . . .............11
OTHER REDNET SYSTEM COMPONENTS ..........................................12
USING REDNET CONTROL.......................................................12
ID (Identification) ............................................................13
Tools Menu .................................................................13
APPENDIX....................................................................14
Connector Pinouts...........................................................14
PERFORMANCE AND SPECIFICATIONS............................................15
Focusrite RedNet Warranty and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Registering Your Product ... ...... . ..... . ...... . ..... . ...... . ..... . ...... . ....17
Customer Support and Unit Servicing ...........................................17
Troubleshooting ... ................... .... .... .... .... .... .... .... .... .... ..17
2
About this User Guide
This User Guide applies only to the RedNet MP8R Mic Preamplifier. It provides information about installing a RedNet MP8R and how to connect it into your system.
A RedNet System User Guide is also available from the RedNet product pages of the Focusrite website. The Guide provides a detailed explanation of the RedNet system concept, that will help you achieve a thorough understanding of its capabilities. We recommend that all users, including those already experienced in digital audio networking, take the time to read through the System User Guide so that they are fully aware of all the possibilities that RedNet and its software have to offer.
Should either User Guide not provide the information you need, be sure to consult:
www.focusrite.com/rednet, which contains a comprehensive collection of common technical
support queries.
Box Contents
• RedNet MP8R unit
• 2 x IEC AC mains cables
• 2 x IEC mains cable retaining clips (See instructions on page 9)
• Safety information cut sheet
• RedNet Getting Started Guide
• Product registration card, provides links to: RedNet Control RedNet PCIe drivers (included with RedNet Control download) Audinate Dante Controller (installed with RedNet Control) Dante Virtual Soundcard (DVS) Token and download instructions
3
INTRODUCTION
Thank you for purchasing the Focusrite RedNet MP8R.
RedNet MP8R is an 8-channel remote-controlled microphone preamplifier and A/D for the Dante audio-over-IP network. Specifically tailored for the road, live-sound and broadcast environments, each unit features network and power redundancy, rugged construction with latching connectors, remote control and remote monitoring. In addition, a gain-compensated split output is available on every channel (see following page for further detail).
Eight remote-controlled Focusrite mic preamps and precision A/D conversion at up to 192kHz/24­bit with minimum latency.
Dual Ethernet connectors (primary and secondary) on the rear-panel allow maximum network reliability with seamless switchover to a standby network in the unlikely event of a network failure. These ports may also be used to daisy-chain additional units when operating in Switched mode.
Redundant power supplies (PSU A and B) with separate input sockets on the rear panel allow one supply to be connected to an uninterruptible source. Each PSU’s status can be monitored remotely over the network or from the front panel.
Audio input uses locking XLR3F connectors on the rear panel.
Rotary gain control with OLED level display for indication of gain settings and system information. A Select button plus 6-segment level meter is provided for each channel. Individual buttons for the selection of input impedance, 20dB Pad, 48V phantom power, high-pass filter and polarity inversion are included on the front panel.
Channels can be remotely controlled via the RedNet Control software package, Pro Tools and MIDI, or OCA (Open Control Architecture) with future firmware updates.
The RedNet MP8R front panel contains a set of LEDs to confirm network status, sample rate and clock sources as well as each mic amp’s input and gain settings.
4
Gain Compensated Split Outputs
The RedNet MP8R is able to provide two outputs from each mic channel: one direct and a second automatically gain-compensated to deliver a constant level. This arrangement allows one engineer (FOH, say) to control the analogue mic gain without affecting the signal level being received by a second engineer on the network.
Network
Interface
Gain Compensation Block Diagram
2.4kΩ
-20dB
Remote Control
+48V
Gain Control
Ø
Gain
DSP
Audio
Network
Mic Inputs
A-D
Ch 1–8
1 – 8
Ch 9–16
Analogue Mic Amp
Individual
Enables ch. 1–8
Global Oset
0/-3/-6dB
The output of the mic amp module feeds the A-D converter. Once in the digital domain, the signal is split into two streams. The first stream passes through unaffected to the corresponding Dante transmitter. The second stream passes through a DSP amplifier which automatically compensates for any changes made to the analogue audio level – either by the front panel controls or over the network. The unit will therefore appear as a 16-channel device on the Dante network, with channels 1-8 being the direct outputs from the preamps and channels 9-16 the compensated outputs.
Gain compensation can be enabled individually for each mic channel.
Headroom Allowance
If during a performance an analogue mic level was reduced by 3dB, the DSP gain for the corresponding
†
‘split’ channel would be increased by 3dB to maintain its overall signal level
. Note however, that this action would push the DSP section 3dB closer to its clipping point. To minimise the likelihood of the DSP ever reaching its clipping point an offset can be applied to allow for some reserve headroom.
The default headroom offset setting will be -6dB, but the user can select 0dB or -3dB from the tools menu under RedNet Control. The setting is applied to all channels 9–16.
†
The global range of the gain compensation available is currently limited to tracking ±12dB from the point at
which it was enabled.
5
INSTALLATION GUIDE
RedNet MP8R Connections and Features
Front Panel
ON
2
43
5
16 7 8
1. AC Power Switch
2. Power Indicators:
• PSU A – Illuminates when an AC input is applied and all DC outputs are present.
• PSU B – Illuminates when an AC input is applied and all DC outputs are present.
When both supplies are functioning and have AC inputs PSU A will be the default supply.
3. RedNet Network Status Indicators:
• PRIMARY – Illuminates when the device is connected to an active Ethernet network. Also illuminates to indicate network activity when operating in switched mode.
• SECONDARY – Illuminates when the device is connected to an active Ethernet network. Not used when operating in Switched mode.
• LOCKED – Illuminates when a valid sync signal is received from the network, or when the RedNet MP8R unit is Network Master.
4. RedNet Sample Rate Indicators
Five orange indicators: 44.1 kHz, 48 kHz, x2 (multiple of 44.1 or 48), x4 (multiple of 44.1 or 48) and sample rate PULL UP/DOWN. These Indicators illuminate individually or in combination to indicate the sample rate being used. For example: for a 96kHz Pull Up/Down setting, the 48kHz, x2 and Pull Up/Down indicators will illuminate.
5. Channel Select Switches and Signal Level LEDs
A Select switch plus six signal-level LEDs for each of the eight channels. Pressing a switch selects which channel is to be controlled – the OLED display will then indicate the current gain setting of that channel. Signal level LEDs illuminate at: -30dB, -18dB, -12dB (green),
-6dB, -3dB (orange) and 0dB/onset of clipping (red).
The Select switches can also be used to activate front panel control lockout; see page 11.
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