User Manual
Table Of Contents
- Title Page
- Quick Start Guide
- 1248 Front Panel
- 1248 Rear Panel
- 8M Front Panel
- 8M Rear Panel
- 16A Rear Panel
- 16A Front Panel
- MOTU AVB Switch
- MOTU AVB Control Web App
- Overview
- It’s not on your hard drive
- Use your favorite web browser
- Control from multiple devices
- Run the installer, get the app
- Make hardware and network connections
- Launching the web app
- Device tab
- Device tab (continued)
- Routing tab
- Mixing tab
- Aux Mixing tab
- Mixer input channel strips
- Main Mix and Monitor channel strips
- Aux bus channel strips
- Group and Reverb channel strips
- 1 About Your MOTU AVB Audio Interface
- State-of-the-art A/D and D/A conversion
- Complementary I/O configurations
- 1248
- 8M
- 16A
- Network I/O
- Universal connectivity
- On-board DSP with mixing and effects
- 32-bit floating point processing
- Modeled vintage effects processing
- AVB system expansion and audio networking
- Matrix routing and multing
- 256 channels of network audio I/O for your host computer
- Web app control
- Stand-alone mixing with wireless control
- ADAT digital I/O
- S/PDIF digital I/O with SRC
- Word clock
- Comprehensive metering
- Headphone outputs
- Precision Digital Trim™
- Rack mount or desktop operation
- AudioDesk
- 2 Packing List and System Requirements
- 3 Software Installation
- 4 Hardware Installation
- Overview
- Rack installation and heat
- Thunderbolt audio interface setup
- USB audio interface setup
- Setup for two interfaces
- Setup for three to five interfaces
- Setup for a multi-switch network
- Setup for multiple Thunderbolt and USB interfaces
- Setup for web app control
- Audio connections
- A typical 1248 setup
- A typical 8M setup
- A typical 16A setup
- Synchronization
- Syncing S/PDIF devices
- Syncing word clock devices
- Syncing an AVB network
- 5 Presets
- 6 The Front Panel LCD
- 7 Working with Host Audio Software
- Overview
- Preparation
- Run the web app
- Sample rate
- Clock Mode
- Enabling and disabling input/output banks
- Specifying the number of computer channels
- Making inputs and outputs available to your host software
- Configuration presets
- Naming computer input and output channels
- Streaming computer audio to and from the onboard mixer
- Working with AVB network streams
- Mirroring computer channels to multiple outputs
- Combining multiple inputs to one output
- Routing grid tutorials
- Choosing the MOTU Audio driver
- Reducing monitoring latency
- Working with on-board mixing and effects
- Synchronization
- 8 Mixer Effects
- 9 Networking
- A Troubleshooting
- B Audio Specifications
- C Mixer Schematics
- D Updating Firmware
- E OSC Support
- Index
HARDWARE INSTALLATION
47
SYNCHRONIZATION
If you connect devices digitally to your MOTU
device, or if you need to synchronize your MOTU
device with an outside time reference such as word
clock, you must pay careful attention to the
synchronization connections and clock source
issues discussed in the next few sections.
Do you need to sync?
If you will be using only your MOTU device’s
analog inputs and outputs (and none of its digital
I/O), and you don’t need to resolve your system to
external word clock, you don’t need to make any
sync connections. You can skip this section.
Situations that require synchronization
There are two general cases in which you will need
to resolve you MOTU device with other devices:
■ Synchronizing with other digital audio devices
so that their digital audio clocks are phase-locked
(as shown in Figure 4-9)
■ Resolving your MOTU device to an external
clock source
■ Networking multiple MOTU AVB interfaces
together
Synchronization is critical for clean digital I/O
Synchronization is critical in any audio system, but
it is especially important when you are transferring
audio between digital audio devices. Your success
in using the digital I/O features on your MOTU
device depends almost entirely on proper synchro-
nization. The following sections guide you through
several recommended scenarios.
Be sure to choose a digital audio clock master
When you transfer digital audio between two
devices, their audio clocks must be in phase with
one another — or phase-locked. Otherwise, you’ll
hear clicks, pops, and distortion in the audio — or
perhaps no audio at all.
Figure 4-9: When transferring audio, two devices must have phase-
locked audio clocks to prevent clicks, pops or other artifacts.
There are two ways to achieve phase lock: slave one
device to the other, or slave both devices to a third
master clock. If you have three or more digital
audio devices, you need to slave them all to a single
master audio clock.
Figure 4-10: To keep the your MOTU interface phased-locked with
other digital audio devices connected to it, choose a clock master.
Also remember that audio phase lock can be
achieved independently of timecode (location).
For example, one device can be the timecode
master while another is the audio clock master. But
only one device can be the audio clock master. If
you set things up with this rule in mind, you’ll have
trouble-free audio transfers with your MOTU
hardware.
Not phase-locked Phase-locked
Device A
Device B
Master
Slave
Master
Slave Slave