248 8M 16A MOTU AVB Switch User Guide Title Page 1280 Massachusetts Avenue Cambridge, MA 02138 Business voice: (617) 576-2760 Business fax: (617) 576-3609 Web site: www.motu.com Tech support: www.motu.
SAFETY PRECAUTIONS AND ELECTRICAL REQUIREMENTS FOR THE 1248, 8M, 16A, and MOTU AVB SWITCH (“PRODUCT”) CAUTION! READ THIS SAFETY GUIDE BEFORE YOU BEGIN INSTALLATION OR OPERATION. FAILURE TO COMPLY WITH SAFETY INSTRUCTIONS COULD RESULT IN BODILY INJURY OR EQUIPMENT DAMAGE. HAZARDOUS VOLAGES: CONTACT MAY CAUSE ELECTRIC SHOCK OR BURN. TURN OFF UNIT BEFORE SERVICING. WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR OTHER MOISTURE.
Contents Part 1: Getting Started 7 Quick Start Guide 9 1248 Front Panel 10 1248 Rear Panel 11 8M Front Panel 12 8M Rear Panel 13 16A Front Panel 14 16A Rear Panel 15 MOTU AVB Switch 17 MOTU AVB Control Web App 27 About Your MOTU AVB Audio Interface 31 Packing List and System Requirements 33 Software Installation 35 Hardware Installation Part 2: Using your MOTU interface 53 Presets 57 The Front Panel LCD 61 Working with Host Audio Software 69 Mixer Effects 75 Networking Pa
About the Mark of the Unicorn License Agreement and Limited Warranty on Software TO PERSONS WHO PURCHASE OR USE THIS PRODUCT: carefully read all the terms and conditions of the “click-wrap” license agreement presented to you when you install the software. Using the software or this documentation indicates your acceptance of the terms and conditions of that license agreement. Mark of the Unicorn, Inc. (“MOTU”) owns both this program and its documentation.
Part 1 Getting Started
Quick CHAPTER Start Guide Thank you for purchasing a MOTU AVB interface! Follow these easy steps to get started quickly. 1 Download and run the MOTU AVB Installer: ■ For advanced network options, and device discovery from any modern browser, see chapter 9, “Networking” (page 75). 6 Choose a preset from the Quick Setup. http://www.motu.com/avb 2 (Optional) For quick access to your MOTU interface from your iPad or iPhone, download the MOTU AVB Discovery app from the Apple App Store.
5 4. GUITAR INPUTS with volume control. These are highimpedance guitar inputs that provide authentic guitar amp volume response and feel. 2. MONITOR OUT volume control. 8. S/PDIF DIGITAL METERS (stereo input and output). 7. ANALOG OUTPUT METERS for the eight balanced (TRS) quarter-inch outputs, main outs, and monitor outs. 6. ANALOG INPUT METERS for the four mic inputs, two guitar inputs, and eight balanced (TRS) quarter-inch inputs on the rear panel. 4 3. PHONE OUTPUTS with volume control.
2 11 7. The 1248’s eight analog outputs are balanced (TRS) quarter-inch connectors that can also accept an unbalanced plug (with the ring disconnected).The output trim can be adjusted from the Output Setting section of the Device Tab in the MOTU AVB Control web app software. 4. These jacks provide stereo, 24-bit S/PDIF digital input and output at all supported sample rates (up to 96 kHz). The input provides sample rate conversion, as explained in “S/PDIF with sample rate conversion” on page 43. 7 6.
3. INPUT METERS for the eight mic inputs. If the 8M’s V-Limit™ feature is engaged for a mic input, and V-Limit kicks in, you’ll see a compression meter extend downwards from the top right of the meter, as shown on channels 1 and 6 in the illustration above. For more information, see “8M mic/guitar input meters with V-Limit™ compressor” on page 57. Also see “Soft Clip™” on page 42. 2. MIC INPUT preamp gain, switchable 48V phantom power, and optional -20 dB pad for each mic input.
1 7 3 6 3. These ADAT optical “lightpipe” jacks provide 16 channels of 24-bit ADAT optical digital I/O at 1x sample rates (44.1 or 48 kHz) and 8 channels at 2x sample rates (88.2 or 96 kHz). They are disabled at higher sample rates. The IN and OUT ports on the right provide channels 1-8 (or 1-4), and the left-hand ports provide channels 9-16 (or 5-8). 2. BNC word clock jacks.
3. ADAT OPTICAL input and output metering. At 1x sample rates (44.1 or 48 kHz), there are sixteen channels of input and output. At 2x (88.2 or 96 kHz), there are eight channels. 5. POWER SWITCH: Thunderbolt, AVB, and USB are “plugand-play” protocols.That means you can turn the 16A off and back on without restarting your computer. 2. ANALOG OUTPUT METERS for the sixteen balanced (TRS) quarter-inch outputs. 1 4.
1 7 3 6 3. These ADAT optical “lightpipe” jacks provide 16 channels of 24-bit ADAT optical digital I/O at 1x sample rates (44.1 or 48 kHz) and 8 channels at 2x sample rates (88.2 or 96 kHz). They are disabled at higher sample rates. The IN and OUT ports on the right provide channels 1-8 (or 1-4), and the left-hand ports provide channels 9-16 (or 5-8). 2. BNC word clock jacks.
1 4 2 3 Another MOTU AVB Switch (to extend the network) A 3rd-party AVB switch An Ethernet device, Wi-Fi router or Ethernet network A third-party AVB device ■ ■ ■ ■ The switch establishes and maintains extremely accurate timing and synchronization among all connected devices. The switch negotiates audio routing throughout the network and guarantees that audio integrity is maintained, regardless of external (non AVB) network traffic. The switch consolidates audio, synchronization, and control together.
MOTU AVB Control Web App CHAPTER OVERVIEW MOTU AVB Control is a web app that gives you complete control over your MOTU audio interface. If you have several MOTU AVB interfaces networked together, such as the 1248 and 8M, you can control them all. If you are working with a large-scale network of many MOTU AVB interfaces, you can access and control any device on the network. MAKE HARDWARE AND NETWORK CONNECTIONS Connect your MOTU interface to your computer or laptop with a Thunderbolt or USB cable.
DEVICE TAB 6 7 8 9 10 5 4 3 2 11 12 13 14 1 15 16 18 17 1. If you have two or more MOTU AVB interfaces, the Device list lets you choose the one you are currently controlling with the web app. 2. The Aux Mixing tab lets you view each Aux bus in the mixer, one at a time. 8. Choose the desired sample rate. 3. The Mixing tab gives you access to the mixing and DSP in the interface. 9. The Quick Setup button prompts factory presets used to configure your interface for a specific application.
DEVICE TAB (CONTINUED) 20 21 19 25 22 24 23 Scroll down to view these additional Device tab settings. 19. In the Input/Output Banks sections, you can disable any banks that you are not using. Doing so hides them from the routing matrix and mixer to simplify operation. Doing so also helps conserve DSP resources. 20. AVB is IEEE’s Audio Video Bridging Ethernet standard for highbandwidth, low-latency audio streaming over Ethernet.
ROUTING TAB 4 5 6 7 8 9 10 3 11 2 12 1 13 14 20 15 19 18 17 16 The Routing Tab lets you route inputs to outputs. Outputs are listed by row on the left; inputs are listed in columns across the top. Simply click in the grid to make a single connection. Click and drag to make multiple connections in one gesture. To route a single input to multiple outputs, make multiple connections vertically in the same column below the input.
MIXING TAB 3 4 5 6 7 8 9 10 11 12 13 14 15 16 2 17 1 30 18 29 28 19 20 27 21 26 22 23 24 25 The Mixing tab gives you full access to the 48-channel mixer in your MOTU AVB interface, which provides a main mix bus, monitor bus, three group busses, seven aux busses, and a dedicated reverb bus. Use the Device tab to configure how many inputs you wish to work with (up to 48). Use the Routing tab (page 20) to route channels to the mixer inputs.
AUX MIXING TAB 3 4 5 6 7 8 9 10 2 1 11 12 16 15 14 13 The Aux Mixing tab provides quick access to your MOTU AVB interface’s mix busses (aux busses, groups and reverb bus), viewed one at a time. Choose a bus in the Aux Mix Target section and then use the faders to directly mix the send levels from all mixer inputs, groups, and the reverb bus. 1. Shows and hides the Mixer Setup sidebar (3), which lets you show and hide channels. 2.
MIXER INPUT CHANNEL STRIPS 1 2 6 25 4 5 To access a mixer input channel strip, go to the mixer tab (page 21), reveal the side bar (item #3 on page 21), and then show the input channel you want in the Mixer Inputs section (29). 26 7 3 2 8 To show and hide sections of the channel strip, such as EQ or the compressor, use the Controls section of the side bar (item #3 in the mixer tab on page 21). 9 1. Click the input channel name to change it. Delete the current name to restore the default name.
MAIN MIX AND MONITOR CHANNEL STRIPS 1 2 3 3 14 4 5 6 4 7 To access the Main Mix and Monitor channel strips, go to the mixer tab (page 21) and scroll the display to the right, beyond the inputs and groups. To show and hide sections of the channel strip, such as EQ or the Leveler, use the Controls section of the side bar (item #3 in the mixer tab on page 21). 8 1. By default, the Monitor bus serves as a solo bus.
AUX BUS CHANNEL STRIPS 1 10 2 3 Aux busses can be used to create sub-mixes. An aux bus can be assigned to any output in the Routing grid (page 20). 4 9 To access an Aux bus channel strip, go to the mixer tab (page 21), reveal the side bar (item #3 on page 21), and then show the aux busses you want in the Mixer Outputs section (26). To show and hide the four-band EQ section of the channel strip, use the Controls section of the side bar (item #3 in the mixer tab on page 21). 1. A stereo aux bus. 2.
GROUP AND REVERB CHANNEL STRIPS 1 9 2 3 Group busses can be used to create a mix subgroup, which is a set of inputs you wish to control together as a group. Groups differ from aux busses in that they have aux sends, a reverb send, as well as a main mix send. In addition, group busses are equipped with the Leveler. 4 The Reverb bus is a special group bus that provides a reverb processor. If you disable the reverb, the reverb bus functions as a (fourth) regular group bus.
CHAPTER 1 About Your MOTU AVB Audio Interface The 1248, 8M, and 16A are hybrid Thunderbolt™/ USB2 audio interfaces with 48-channel digital mixers and AVB Ethernet networking capability. They can operate as audio interfaces for a computer, as stand-alone digital mixers, as gateways to an expanded studio system, as components of an extended AVB audio network, or as capable hybrid devices performing all of these roles simultaneously.
Universal connectivity The 1248, 16A, and 8M can connect to a computer with Thunderbolt or high-speed USB 2.0 (which is compatible with USB 3.0). They are USB audio class-compliant, which means that they are iPad compatible (with a camera connection kit) and do not require driver installation for USB connection to a computer. Industry standard audio drivers for both Thunderbolt and USB operation provide universal compatibility with any audio software.
WiFi network. Multiple devices can be used simultaneously to access any audio interface settings on the network. Stand-alone mixing with wireless control If you connect your MOTU interface to an Apple Airport or other WiFi router with a standard Ethernet cable, you can control its powerful mixing and DSP effects from your smart phone or tablet, without a computer — great for live sound mixing from your iPad, tablet, or other wireless device.
ABOUT YOUR MOTU AVB AUDIO INTERFACE
CHAPTER 2 Packing List and System Requirements PACKING LIST PLEASE REGISTER TODAY! Your MOTU interface ships with the items listed below. If any of these items are not present in the box when you first open it, please immediately contact your dealer or MOTU. Please register your MOTU interface today. There are two ways to register. ■ One audio interface ■ One USB cable ■ One power cord ■ One manual ■ Product registration card SYSTEM REQUIREMENTS ■ A 1 GHz Intel-based Mac.
PACKING LIST AND SYSTEM REQUIREMENTS
CHAPTER 3 Software Installation OVERVIEW USB 2.0 class-compliant operation. . . . . . . . . . . . . . . . . . . Software installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Core Audio drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MOTU AVB Discovery app . . . . . . . . . . . . . . . . . . . . . . . . . . . AudioDesk workstation software . . . . . . . . . . . . . . . . . . . . 33 33 34 34 34 USB 2.
RUN THE MOTU AUDIO INSTALLER AUDIODESK WORKSTATION SOFTWARE To download the latest MOTU AVB installer, visit www.motu.com/avb. Follow the directions that the installer gives you. AudioDesk is an advanced workstation software package that lets you record, edit, mix, process, bounce and master multi-track digital audio recording projects. Advanced features include realtime effects processing, recording, and much more.
CHAPTER 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 . . . . . . . . . . . . . . . . . . . .
USB AUDIO INTERFACE SETUP SETUP FOR TWO INTERFACES OR Use this setup if you want to use your MOTU device as an audio interface, and your computer doesn’t have Thunderbolt. ■ Use a standard USB cable. ■ Connect to any USB port (USB2.0 or 3.0). ■ See “USB2.0 class-compliant operation” on page 33. No driver installation is necessary, (unless you want to use the Web app). ■ Use this setup if you want to connect two MOTU interfaces to your computer.
SETUP FOR THREE TO FIVE INTERFACES Use this setup if you want to connect three to five MOTU interfaces to your computer using a MOTU AVB Switch™ (sold separately). ■ The connection to the computer should be Thunderbolt, to support a large number of audio streams to and from the networked interfaces. A single Thunderbolt connection supports 128 channels in and out, simultaneously.
SETUP FOR A MULTI-SWITCH NETWORK Use this setup if you want to connect more than five MOTU interfaces to an extended network that employs multiple AVB switches. AVB Ethernet is an industry standard, so you can use MOTU AVB Switches or 3rd-party AVB switches. ■ You can daisy-chain switches in serial fashion, but don’t create loops. For example, switches A, B, and C below are chained properly, but don’t connect C back to A. Alternately, you could connect both Switches B and C to Switch A.
SETUP FOR MULTIPLE THUNDERBOLT AND USB INTERFACES It is possible to connect multiple MOTU interfaces directly to your host computer through multiple Thunderbolt and USB ports, as discussed in the following sections. However, there are several disadvantages to doing it this way: The audio interfaces will not be clocked to one another and may be susceptible to drift, unless you use external word clock connections.
SETUP FOR WEB APP CONTROL The MOTU AVB Control web app gives you access to all settings, routing, mixing, and effects processing in your audio interface, and each interface on the AVB network, if applicable. For more info, see “MOTU AVB Control Web App” on page 17. Mixing and matching web app control scenarios The web app connection scenarios shown in the following sections are not exclusive from one another.
Ethernet cable A simple Ethernet cable connection can be used for web app control, even without a USB or Thunderbolt connection to your computer. For example, if you are using your MOTU device as a mixer or audio router, you could control the on-board routing, mixing and effects from the web app through a standard Ethernet connection. WiFi When using standard WiFi as shown, you can control your MOTU interface from multiple WiFi devices simultaneously.
AUDIO CONNECTIONS Here are a few things to keep in mind as you are making audio connections to your MOTU interface. Mic inputs with preamps Connect a microphone using a standard mic cable. ☛ Do not connect a +4 dBu (line level) signal to the mic inputs without using the -20dB Pad. It is recommended you connect line level signals to the quarter-inch inputs instead.
TRS quarter-inch analog trims All quarter-inch analog inputs and outputs can be trimmed. This allows them to support a variety of standards, including EBU-R68, SMPTE RP-155, +4dBu, -10dBV, 2vRMS, 1vRMS. Quarter-inch analog inputs are equipped with high-quality, digitally controlled analog trim that provides a 22dB range (+2dBu to +24dBu) in 1dB steps. Outputs can be trimmed at the digital stage, before the DAC. Range is 16 dB. Trim controls are most easily accessed in the web app.
A TYPICAL 1248 SETUP recording, you can use the 1248’s on-board mixing to listen to what you are recording via the main outs, headphone outs, or any other output pair. You can control all mixing and effects processing from your laptop, tablet, or smart phone. Here is a typical 1248 studio setup. This rig can be operated without an external mixer. All mixing and effects processing can be done in the 1248 itself, on the computer with audio software, or both.
A TYPICAL 8M SETUP Here is a typical 8M studio setup. Like the 1248, this rig can be operated without an external mixer. All mixing and effects processing can be done in the 8M itself, on the computer with audio software, or both. During recording, you can use the 8M’s on-board mixer to listen to what you are recording via the headphone out or any output pair. You can control all mixing and effects processing from your laptop, tablet or smart phone.
A TYPICAL 16A SETUP Here is a typical 16A studio setup, although the 16A is certainly flexible and supports many operational configurations not shown here. This diagram is meant to give you just a few ideas of what is possible. The 16A can be used as an audio interface, mixer, effects processor, or even as a patch bay. You can control all mixing, effects processing, and routing from your laptop, tablet or smart phone. 5.1 or 7.
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.
SYNCING S/PDIF DEVICES The 1248 provides RCA (coax) S/PDIF digital input and output. Your 1248 and the other S/PDIF device will sync to each other by way of the S/PDIF connection itself. One device is the master, and the other device is the slave. Syncing the 1248 to its S/PDIF input When you transfer audio from the S/PDIF device into the 1248, choose S/PDIF as the clock source (item #13 on page 18) to resolve the 1248 to its S/PDIF input.
SYNCING AN AVB NETWORK The AVB protocol provides sophisticated and accurate timing, synchronization, and clocking features for AVB device networks of any size as shown on pages 37-38, including: ■ Low latency ■ Network-wide time base ■ Better-than-sample-accurate phase lock across all connected devices ■ Timing accuracy down to the nanosecond Choosing a master clock The Web app provides an easy way to choose one device as the master clock for your whole MOTU AVB network.
HARDWARE INSTALLATION
Part 2 Using your MOTU interface
CHAPTER 5 Presets OVERVIEW AUDIO INTERFACE Because of its advanced, extensive feature set, your MOTU AVB interface can be used for many different purposes. This chapter discusses common use cases and their corresponding device presets, to help you use the hardware for your needs. Choose the Audio Interface preset to use your MOTU AVB device as a standard USB or Thunderbolt audio interface.
STAND-ALONE MIXER INTERFACE + MIXER Choose the Stand-alone mixer preset to use your MOTU AVB device as a mixer. Doing so routes all physical inputs to the mixer with the mixer main out and monitor out going to two hardware output pairs. Choose the Interface + Mixer preset to use your MOTU AVB device as both an audio interface and mixer, simultaneously. Doing so routes all physical inputs and outputs to and from the computer, connected through USB or Thunderbolt.
LIVE RECORDING WITH MONITOR MIXING Choose the Live recording with monitor mixing preset when you are tracking in the studio. The setup is pretty much the same as for the “Interface + mixer” preset discussed in the previous section, shown in Figure 5-3 on page 54. All physical inputs on the interface are routed to both the computer (for recording) and the Main Mix and Monitor busses in the mixer (for near-zero latency monitoring).
STUDIO OUTPUT EXPANDER Use the Studio Output Expander preset when you already have a main system set up, but you want to add additional outputs. This preset routes AVB network streams to all physical outputs on the expansion MOTU AVB interface. You must choose which network streams are used in the AVB Stream Connections section of the Device tab of the expansion MOTU AVB interface.
CHAPTER 6 The Front Panel LCD OVERVIEW LEVEL METERS The front panel LCD displays level meters for all inputs and outputs (except the phones). On the 1248 and 8M, the LCD also provides horizontal “long-throw” input metering when adjusting preamp gain. In its default state when the unit is first powered on, the LCD displays level meter activity for all physical audio inputs and outputs on the device. Inputs and outputs are labeled by channel number or left/right stereo configuration, if applicable.
PUSH-BUTTON KNOBS On the 1248 and 8M, the knobs (Figure 6-2) are push-button digital rotary encoders. Push the knob for the function labeled in blue. to show the horizontal meter until the active channel’s knob is pushed again. Switch directly to another channel’s horizontal meter by pushing or turning its knob. Push the selected channel’s knob again to unpin.
Network menu The Network menu displays the following network-related information: Setting Explanation Serial/UID Unique AVB network identifier that can be used for troubleshooting. IP address The unique network address for the unit. Type this address into your web browser to access the unit’s settings in the MOTU AVB Control web app. AVB Indicates whether AVB networking is currently enabled or disabled. For example, AVB could be disabled because a non-AVB switch is being used.
THE FRONT PANEL LCD
CHAPTER 7 Working with Host Audio Software OVERVIEW RUN THE WEB APP Your MOTU interface provides multi-channel audio input and output for Core Audio compatible audio applications, including MOTU’s Digital Performer and AudioDesk, Apple’s Logic Pro and GarageBand, and other third-party software applications such as Ableton Live, Avid Pro Tools, Cockos Reaper, Propellerhead Reason and Record, Steinberg Cubase and Nuendo, PreSonus Studio One, Bitwig, and others.
Specifying the number of computer channels In the web app Device tab (page 19), in the Computer Setup section, specify the number of computer channels for streaming audio to and from your host audio software. You might want enough channels to cover the following: Physical inputs you want to record on your computer. ■ ■ The physical outputs you want to send audio playback to.
Configuration presets The presets menu (item #7 in the Devices tab on page 18) provides many useful presets for various host routing scenarios. These presets are a convenient shortcut for the routing grid setups discussed in the next few sections. Naming computer input and output channels Click on any computer input or output name in the routing grid (Figure 7-1) to change its name. These names appear in your host audio software (if supported).
Conversely, you can stream audio from the computer into the mixer. Channels coming from the computer are represented across the top of the routing grid as inputs. To route a computer channel to the mixer, click the grid at the intersection of the computer channel column and the desired mix input row. Now, that computer channel will be routed to the mixer input.
Live Open the Preferences window and click the Audio tab. Choose Core Audio from the Driver Type menu. Choose 1248 (or other MOTU interface model) from the Input Audio Device and Output Audio Device menus. To enable or disable input or output channels, click the Input Config or Output Config buttons. Reason and Record Open the Preferences window, choose Audio preferences from the menu and choose 1248 (or other MOTU interface model) from the Audio Output menu.
In either case (routing directly in the grid or routing through the mixer), be sure to maintain the input’s connection to the computer as well, so the input signal can be recorded in your host software. In other words, you’ll want to make sure there are two tiles enabled in the input’s column in the grid: one tile for the connection to the computer and another tile for your monitoring output (or a mixer input, if you are using the mixer to apply effects).
Figure 7-6: When adjusting the buffer size to reduce monitoring latency, watch the ‘processor’ meter in Digital Performer or AudioDesk’s Performance Monitor. If you hear distortion, or if the Performance meter is peaking, try raising the buffer size. Figure 7-5: In Logic Pro, go to the Audio Driver preferences to access the Buffer Size option shown above.
WORKING WITH ON-BOARD MIXING AND EFFECTS Your MOTU interface provides powerful mixing, EQ, compression and reverb, which can operate hand-in-hand with your host’s mixing environment. For example, your MOTU interface can serve as a monitor mixer, routing channels to musicians, or it can serve as an integrated extension of your host’s mixing environment. You can even save a particular mixing configuration as a preset for future recall. For details, see “Mixing tab” on page 21.
CHAPTER 8 Mixer Effects OVERVIEW Leveler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 This chapter provides further information about the effects processors available in the DSP mixer in your MOTU AVB interface. For basic mixer operation, see: The Leveler™, an accurate model of the legendary LA-2A optical compressor, which provides vintage, musical automatic gain control Reverb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GATE All input channel strips provide a Gate module. Enabling EQ Each band has an enable/disable button (Figure 8-2), allowing you to enable as few or as many bands as needed for the channel strip. Figure 8-1: The Gate module. The gate silences the signal when the input signal’s level drops below the Threshold. Enable/disable The rate at which the gate responds, (opens to let signal through) is determined by the Attack parameter.
be flexible enough to cover a broad range of applications. By adjusting Gain and Bandwidth together, you can emulate the smooth and musical character of classic analog EQ circuits, in which the Gain/Bandwidth dependency was dictated by the actual circuit design and electrical components used. Low and high shelf filters The Low and High bands offer a shelf option that is similar to those found in most conventional parametric EQs. COMPRESSOR All mixer input channel strips provide a compressor module.
LEVELER The Leveler™ (Figure 8-4) provides an accurate model of the legendary Teletronix™ LA-2A® optical compressor, known for its unique and highly sought-after Automatic Gain Control (AGC) characteristics. Figure 8-4The Leveler module. The Leveler is available on the Main Mix bus and all Group busses, including the Reverb bus. A model of an optical compressor An optical leveling amplifier works by shining a light on a photoresistor.
Enabling or disabling the Leveler The Leveler models the LA-2A so closely, it also models the time it takes for an actual LA-2A to “warm up” after it is turned on. Therefore, when you enable the Leveler, give it a moment to “settle” before you begin processing signals with it. Gain Reduction Gain Reduction (Figure 8-4) sets the strength of the signal sent to the AGC model. Makeup Gain Makeup gain (Figure 8-4) amplifies the output signal to make up for gain reduction.
setting represents the bottom frequency of the Mid band. The Ratio determines the length for each band specified in a percentage of the low frequency reverb time. DSP USAGE The DSP Usage meter (item #26 on page 23) shows how much of the available DSP processing power is currently being used by the mixer for the mix and for effects processing. If there aren’t enough DSP resources for all effects to be enabled on a channel, effects are disabled for that channel and all subsequent channels.
CHAPTER 9 Networking OVERVIEW The Audio Video Bridging (AVB) network port on your MOTU interface opens up a world of possibilities for creating expanded, customized audio network systems. About AVB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MOTU’s AVB implementation . . . . . . . . . . . . . . . . . . . . . . . . Networking examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A quick guide to networking . . . . . . . . . . . . . . . . . . . . .
■ AVB is already shipping on current Macs — Apple has already implemented initial support for AVB on all current shipping Macs. MOTU is working closely with Apple to realize the full potential of AVB Ethernet class-compliant connectivity and scalable networking for all current-generation Macs. MOTU’S AVB IMPLEMENTATION MOTU engineering has faithfully implemented the IEEE 802.1 AVB standard for the MOTU AVB products.
computer system. Despite the distance, the two interfaces operate as a seamless system, controlled from your computer or iPad. Studio installation A studio installation of three to five interfaces can be handled with a single MOTU AVB Switch. See “Setup for three to five interfaces” on page 37. Networking is ideal for studio installation because you can position interfaces at strategic locations. Running cables becomes much simpler and more cost effective.
A QUICK GUIDE TO NETWORKING MOTU AVB networking has been designed to be powerful, yet straightforward to set up and use. Here are a few things that are useful to know. Networking basics ■ Before proceeding below, review the networking connection diagrams on pages 36-38. ■ When making network connections, use shielded CAT-5e or CAT-6 cables (a higher grade cable). ■ Network cable lengths can be long: 100 meters with standard copper wire cables; much longer with fiber-optic network cables.
■ A computer can be connected to the network through its Ethernet port, but only for the purposes of running the web app on the computer for command and control over the network. You cannot stream audio through the computer’s Ethernet port. At this time, MOTU is working closely with Apple on direct AVB support using the network connectors. ■ All computers and interfaces on the network have full access to each other. ■ MOTU employs a 1 Gbit AVB implementation in its rack interfaces and the MOTU AVB Switch.
BRIDGING TO ETHERNET The Ethernet port on the MOTU AVB Switch allows you to connect standard network devices, such as: ■ A WiFi router ■ An Ethernet hub or switch connected to a local home, studio, or office network ■ Any other standard networking device THE MOTU AVB SWITCH The heart of a MOTU AVB network is the MOTU AVB Switch (sold separately). For a brief overview of the switch and its features, see “MOTU AVB Switch” on page 15.
Part 3 Appendices
APPENDIX A Troubleshooting Some or all of my MOTU interface inputs and outputs are not available in my host audio software. Make sure that the inputs and outputs are enabled in the Device tab (“Device tab” on page 18) and routed to and from the computer in the Routing tab (“Routing tab” on page 20). For details, see “Making inputs and outputs available to your host software” on page 62. I have absolutely no audio input or output happening to or from my interface.
I hear clicks and pops under word clock sync. Many problems result from incorrect word clocking. It is essential that all digital devices in the system be word locked. Consult “Synchronization” on page 47 for detailed information on how to word clock your gear. Whenever there is any unexpected noise or distortion, suspect incorrect word lock. Clicks and pops due to hard drive problems...
APPENDIX B Audio Specifications 1248 Line Out Connector Type 1/4” Female, TRS Balanced, tip hot Output Impedance 100 ohm Per leg Dynamic Range 123 dB A-weighted THD+N -110 dB (0.0003%) -1 dBFS, Unweighted, 1 kHz Frequency Response +0, -0.1 dB, 20 Hz/20 kHz Ref.
S/PDIF Includes Sample Rate Conversion (SRC) on input Connector Type RCA Termination 75 ohm I/O Lock Range 44.1k/48k, +/- 0.5% 1x, 2x Input Voltage Range 0.2 Vpp/1Vpp With termination Output Drive 0.5.0 Vpp With termination DC coupled THD+N In (SRC) -122 dB Unweighted, With SRC Specification IEC-958/60968-3 Phones Connector Type 1/4” Female, TRS Stereo Tip Left, Ring Right Dynamic Range 108 dB A-Weighted THD+N -100 dB Unweighted Frequency Response +0 -0.
8M Line Out Connector Type 1/4” Female, TRS Balanced, Tip hot Output Impedance 100 ohm Per leg Dynamic Range 123 dB A-weighted THD+N -110 dB (0.0003%) -1 dBFS, Unweighted, 1 kHz Frequency Response +0 -0.1 dB, 20 Hz/20 kHz Ref. 1 kHz Max Level Out +20 dBu Trim Range 24 dB in 1 dB steps -4 dBu to +20 dBu Combo-style, XLR / TRS Pin 2 hot, tip hot MIC in Connector Type XLR Impedance load 3 k ohm, 4.
Word Clock In/Out/Thru Specification AES-11 2009 Annex B Jack Type BNC Termination 75 ohm (in/out) THRU is unterminated Lock Range 44.1 kHz / 48 kHz, +- 0.5% x1/x2/x4 Input 1 vpp to 3 v p-p (with termination) AC coupled Output 5.0 vpp, (2.5 v p-p terminated) DC coupled Jitter Complies with AES3-4-2009 < 0.
16A Line Out Connector Type 1/4” Female, TRS Balanced, Tip hot Output Impedance 100 ohm Per leg Dynamic Range 123 dB A-weighted THD+N -110 dB (0.0003%) -1 dBFS, Unweighted, 1 kHz Frequency Response +0 -0.1 dB, 20 Hz/20 kHz Ref.
APPENDIX B: AUDIO SPECIFICATIONS
APPENDIX C Mixer Schematics MONO INPUT CHANNEL 91
STEREO INPUT CHANNEL + 92 APPENDIX C: MIXER SCHEMATICS
GROUP BUS + 93 APPENDIX C: MIXER SCHEMATICS
MONITOR BUS + 94 APPENDIX C: MIXER SCHEMATICS
APPENDIX D Updating Firmware MOTU periodically posts firmware updates for your MOTU AVB interface. These updates may include bug fixes, enhancements, and new features. Updates are posted on MOTU’s servers. If your computer or Wi-Fi device has access to the internet, the MOTU AVB Control app notifies you as soon as an update is made available. Otherwise, you can check motu.com/avb periodically for the latest firmware update.
Updating off-line, without internet access If your MOTU AVB interface (and the computer it is connected to) has no internet access, you can download a firmware update file from another computer that does have internet, and then use the file to update your MOTU interface, as follows: 1 Download the firmware file. 2 Transfer the file to a computer with a network cable connection to your MOTU interface. 3 Launch the MOTU AVB Control web app on the computer, as usual. 4 Go to the Device tab.
APPENDIX E OSC Support Open Sound Control (OSC) is a protocol for communication among computers and other multimedia devices that is optimized for modern networking technology. MOTU AVB audio interfaces support OSC, which provides remote control of all device settings and mixer controls from any OSC-enabled controller. For further details about remote control through OSC, along with complete documentation for the MOTU AVB OSC API, visit: http://www.motu.
APPENDIX E: OSC SUPPORT
Index +4dB analog input 42 -10dB analog input 42 1248 expansion 36 front panel 9 installing 35 rear panel 10 summary of features 27 16A expansion 36 front panel 13 installing 35 rear panel 14 summary of features 27 24-bit optical 10, 12, 14 8M expansion 36 front panel 11 installing 35 rear panel 12 Soft Clip 42 summary of features 27 V-Limit 42, 57 A Ableton Live 61 ADAT optical 10, 12, 14 connecting 43 SMUX Type 59 Analog inputs/outputs 10, 12, 14, 43 making connections to 42 Apple GarageBand 64 ASIO moni
7, 55 Logic Pro/Express 61 clock source 61 sample rate 61 Lookahead 57 M Mac OS X 61 input and output names 63 Makeup gain 73 Mic inputs 42 preamp gain/pad/48V 9 Mic/guitar inputs 42 connecting 44, 45, 46 Soft Clip 42 V-Limit 42, 57 Mixer accessing 21 aux bus 25 effects 69 group bus 26 input channel strip 23 main mix channel strip 24 Monitor channel strip 24 overview 21 Reverb bus 26 schematics 91 Setup 19 stand-alone operation 69 Mixing tab 21 Monitor output volume control 9 MOTU AudioDesk 64 AVB Switch 1