MOTU 1248 User Manual
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MOTU 1248 User Manual

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1248
™
8M
™
16A
™
MOTU AVB Switch
™
User Guide
1280 Massachusetts Avenue
Cambridge, MA 02138
Title Page
Business voice: (617) 576-2760
Business fax: (617) 576-3609
Web site: www.motu.com
Tech support: www.motu.com/support

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Summary of Contents for MOTU 1248

  • Page 1 1248 ™ ™ ™ MOTU AVB Switch ™ User Guide 1280 Massachusetts Avenue Cambridge, MA 02138 Title Page Business voice: (617) 576-2760 Business fax: (617) 576-3609 Web site: www.motu.com Tech support: www.motu.com/support...
  • Page 2 The MOTU product is equipped with a three-conductor cord and grounding type plug which has a grounding prong, approved by Underwriters' Laboratories and the Canadian Standards Association. This plug requires a mating three-conductor grounded type outlet as shown in Figure A below. If the outlet you are planning to use for the MOTU product is of the two prong type, DO NOT REMOVE OR ALTER THE GROUNDING PRONG IN ANY MANNER.

  • Page 3: Table Of Contents

    8M Front Panel 8M Rear Panel 16A Front Panel 16A Rear Panel MOTU AVB Switch MOTU Pro Audio Control Web App About Your MOTU AVB Audio Interface Packing List and System Requirements Software Installation Hardware Installation Part 2: Using your MOTU interface...
  • Page 4 Authorization Number on the outside of the box below the shipping address. That license agreement is a contract, and clicking “Accept” binds you and MOTU to This warranty does not apply if the equipment has been damaged by accident, all its terms and conditions.

  • Page 5: Part 1: Getting Started

    Part 1 Getting Started...

  • Page 7: Quick Start Guide

    Ethernet cable (sold separately). 6 Click Quick Setup and choose a preset. 4 Switch on your MOTU interface. 5 Open the MOTU Pro Audio Control web app by doing one of the following: Choose your interface from the MOTU ■...

  • Page 9: 1248 Front Panel

    (TRS) quarter-inch 14. Push ID to display network settings for the device, 4. GUITAR INPUTS with trim control. These are high- and-play” protocols. That means you can turn the 1248 inputs on the rear panel. including its IP address.

  • Page 10: 1248 Rear Panel

    (with the ring disconnected). Control volume These inputs are also equipped with the 1248’ s Precision ■ Another 1248 or any other MOTU AVB-equipped audio...

  • Page 11: 8M Front Panel

    8M Front Panel 1. HEADPHONE JACK with volume control. 4. OUTPUT METERS for the eight balanced TRS analog 8. The multi-purpose backlit LCD displays level meters for 11. Push TRIM to enter trim mode. In this mode, the LCD outputs. all inputs and outputs.

  • Page 12: 8M Rear Panel

    Output Setting section of ■ slave to the clock supplied by their digital I/O connection interface, such as the 1248, 8M, 16A, 24Ai, 24Ao, 112D, the Device Tab in the MOTU Pro Audio Control web app with the 8M.

  • Page 13: 16A Front Panel

    16A Front Panel 1. ANALOG INPUT METERS for the sixteen balanced (TRS) 4. The CLOCK section displays the current operating sample 6. Push SEL (select) to enter the LCD menu. Push the quarter-inch inputs. rate and clock mode (source) for the unit. ARROW buttons to scroll through menu options.

  • Page 14: 16A Rear Panel

    Another 16A or any other MOTU AVB-equipped audio Device Tab in the MOTU Pro Audio Control web app ■ slave to the clock supplied by their digital I/O connection interface, such as the 1248, 8M, 16A, 24Ai, 24Ao, 112D, software. with the 16A. Monitor 8, etc.

  • Page 15: Motu Avb Switch

    For local connections, patch cables can be used, but will reduce the maximum total cable run length. The MOTU AVB Switch provides deep functionality that goes beyond a standard Ethernet switch. No configuration is necessary. The switch configures itself and manages all device ■...

  • Page 17: Motu Pro Audio Control Web App

    CHAPTER OVERVIEW MAKE HARDWARE AND NETWORK CONNECTIONS MOTU Pro Audio Control is a web app that gives Connect your MOTU interface to your computer you complete control over your MOTU audio or laptop with a Thunderbolt or USB cable. Make interface.
  • Page 18 DEVICE TAB Windows only 1. If you have two or more MOTU AVB 9. Choose the desired sample rate. 14. Choose the clock source from the 18. (Windows only) Choose the Host interfaces, the Devices list lets you Make sure your host audio software Clock Mode menu.
  • Page 19 29. Click Reboot to restart the interface. conversion, even after it stops Default setting. 24. Your MOTU interface can resolve to receiving time code. Click Stop Jam 30. When the Computer Volume Controls SMPTE time code, also referred to as 27.
  • Page 20 5-6. Also, hardware inputs itself. In this example, each 1248 supply the main mix bus, monitor input. To mix multiple inputs to the and outputs are being routed to and...
  • Page 21 finite DSP resources. If you don’t 1248, 8M or 16A is connected to a the routing grid. You can also config- computer (item 9 on page 20). You...

  • Page 22: Mixing Tab

    MIXING TAB The Mixing tab gives you full access to the top lets you create, name, save 13. The Main Mix bus is the master fader 21. Solo and mute. On the Monitor bus, the 48-channel mixer, which provides a and manage entire mixer presets.

  • Page 23: Aux Mixing Tab

    4. Click the aux bus or group you wish 10. Solo and mute for the aux bus 14. Show and hide mix groups and the access to your MOTU AVB interface’s mix to view in the window. In this master fader. The mute buttons for reverb bus here.

  • Page 24: Mixer Input Channel Strips

    MIXER INPUT CHANNEL STRIPS To access a mixer input channel strip, go to 15. The thumbnail Compressor Graph the Mixing tab (page 22), reveal the side bar provides a graphic representation of the (item #3 on page 22), and show the input compressor, when enabled.

  • Page 25: Main Mix And Monitor Channel Strips

    MAIN MIX AND MONITOR CHANNEL STRIPS To access the Main Mix and Monitor 7. The four-band parametric EQ for the channel strips, go to the Mixing tab Main Mix bus operates the same as (page 22) and scroll the display to the described for input channels (items right, beyond the inputs and groups.

  • Page 26: Aux Bus Channel Strips

    AUX BUS CHANNEL STRIPS Aux busses can be used to create sub-mixes. An aux bus can be assigned to any output in the Routing grid (page 20). To access an Aux bus channel strip, go to the Mixing tab (page 22), reveal the side bar (item #3 on page 22), and then show the aux busses you want in the Mixer Outputs section (28).

  • Page 27: Group And Reverb Channel Strips

    GROUP AND REVERB CHANNEL STRIPS Group busses can be used to create a mix sub-group, 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.
  • Page 28 On Faders bus. friendly EQ controls. that section of channels. Output 4. If you accessed your MOTU interface busses are displayed on the far right. 24. Shows/hides channel strips (5) for through the MOTU Discovery app, 10.
  • Page 29 TOUCH CONSOLE CHANNEL SETTINGS Touch any channel setting (items 8, 9 5. The Sends tab (15) displays long- or 10 on page 28) to access the throw faders for all of the channel tab shown above. channel’s available sends, includ- ing aux sends, group sends, the 1.
  • Page 30 TOUCH CONSOLE CHANNEL STRIP 1. Tap to access the channel settings (item 13 on page 29). 2. Tap to access the multiband EQ settings (items 8 and 12 on page 29). 3. Tap to access the dynamics processing for the channel (item 14 on page 29).

  • Page 31: About Your Motu Avb Audio Interface

    About Your MOTU AVB Audio CHAPTER Interface The 1248, 8M, and 16A are hybrid Thunderbolt™/ 1248 66 simultaneous audio channels USB2 audio interfaces with 48-channel digital mixers and AVB Ethernet networking capability. Connection Input Output They can operate as audio interfaces for a...
  • Page 32 Other MOTU AVB interfaces Stage-B16 The 1248, 8M and 16A are part of a larger family of 28 simultaneous audio channels (two rack-space audio interfaces, summarized below, with enclosure) complementary I/O configurations. Connection Input Output 24Ai Mic inputs with individual preamps on XLR...
  • Page 33 AVB stands for the IEEE 802.1 Audio Video The 1248, 8M, and 16A interfaces let you stream up Bridging Ethernet standard for high-bandwidth, to 128 audio channels in and out, simultaneously, low-latency audio streaming over Ethernet. You...
  • Page 34 Mac and Windows that is sample rates (from 88.2 to 192 kHz). The word available as a free download for you as a 1248, 8M clock OUT port can alternately be used as a THRU or 16A owner. Visit motu.com/proaudio to obtain port for word clock daisy-chaining.

  • Page 35: Packing List And System Requirements

    CHAPTER System Requirements PACKING LIST PLEASE REGISTER TODAY! Your MOTU interface ships with the items listed Please register your MOTU interface today. There below. If any of these items are not present in the are two ways to register. box when you first open it, please immediately Visit www.motu.com/register...
  • Page 36 P A C K I N G L I S T A N D S Y S T E M R E Q U I R E M E N T S...

  • Page 37: Software Installation

    MOTU Discovery app ....... . 39 computer and your MOTU interface with a MOTU Pro Audio WebUI Setup for Windows .
  • Page 38 Mac (CoreAudio) and Windows (ASIO and Wave). Thunderbolt support for Mac and Windows Figure 3-1: Choosing the MOTU Pro Audio ASIO driver in Cubase. You can connect your MOTU interface to a WDM / Wave driver support Thunderbolt-equipped PC and access up to 128...
  • Page 39 Audio Control web app directly in your favorite Figure 3-2: Access the ‘Host Buffer Size’ and ‘Host Safety Offset’ web browser. settings in the web app Device tab for your MOTU interface. Be careful with very small buffer sizes, as they can AUDIODESK WORKSTATION SOFTWARE...
  • Page 40 S O F T W A R E I N S T A L L A T I O N...

  • Page 41: Hardware Installation

    Audio connections........51 A typical 1248 setup ....... . . 54 Use this setup if you want to use your MOTU A typical 8M setup .

  • Page 42: Usb Audio Interface Setup

    Use this setup if you want to use your MOTU device as an audio interface, and your computer doesn’t have Thunderbolt. Use this setup if you want to use the your MOTU Use a standard USB cable. ■ interface as an iOS audio interface.

  • Page 43: Avb Ethernet Audio Interface Setup

    SETUP FOR TWO INTERFACES As an alternative to Thunderbolt or USB, use this setup if you want to use the your MOTU interface as an AVB Ethernet audio interface for a recent- generation Mac (i.e. any Mac with a Thunderbolt port on it).

  • Page 44: Setup For Three To Five Interfaces

    Use the five AVB NETWORK ports on the switch ■ Use this setup if you want to connect three to five (not the Ethernet port). MOTU interfaces to your computer using a MOTU Network cable lengths can be long: 100 meters ■ AVB Switch™ (sold separately).

  • Page 45: Setup For A Multi-Switch Network

    C below are chained properly, but don’t employs multiple AVB switches. AVB Ethernet is an connect C back to A. Alternately, you could industry standard, so you can use MOTU AVB connect both Switches B and C to Switch A. Switches or 3rd-party AVB switches.

  • Page 46: Setup For Multiple Thunderbolt And Usb Interfaces

    43), multiple AVB audio interfaces can be pages 43-45, which allows you to route audio connected using a MOTU AVB Switch (or any 3rd- streams (hundreds at a time) directly among party AVB switch), and the Mac can see all of them interfaces with near-zero latency.

  • Page 47: Setup For Web App Control

    SETUP FOR WEB APP CONTROL Mixing and matching web app control scenarios The MOTU Pro Audio Control web app gives you The web app connection scenarios shown in the access to all settings, routing, mixing, and effects following sections are not exclusive from one processing in your audio interface, and each another.
  • Page 48 Figure 4-3: Web app control through a standard Ethernet hub or network (LAN). (Sold separately) Figure 4-5: Using the Ethernet port on the MOTU AVB Switch. H A R D W A R E I N S T A L L A T I O N...

  • Page 49: Setup For Avb Ethernet Audio Interface Operation

    Alternately, you can connect both the Mac and the interface to an AVB-compatible Ethernet switch. Mac virtual entity Web app setup Figure 4-7: Accessing the AVB settings for the Mac in the MOTU web To set up your MOTU device as an AVB Ethernet app. audio interface: 4 From the Configuration menu (Figure 4-7),...
  • Page 50 6 For Playback from the Mac, go to the Routing Figure 4-10: Routing Mac channels to physical outputs. tab for your MOTU interface (the 1248 in the 8 For Recording to the Mac, route desired physical example below), and connect the input streams to inputs on your MOTU interface to output streams.

  • Page 51: Audio Connections

    Clocking engage the mic input’s corresponding front-panel In the example in Figure 4-12, the 1248 is the clock phantom power button. master and the Mac is clocking to the 1248’s Output Stream 1. You can also reverse this...
  • Page 52 48V Dedicated main outs and monitor outs Like all I/O on the 1248, the main outputs and phantom power. (Phantom power is supplied to the monitor outputs operate as independent pairs XLR connector only.) Use these general guidelines (they don’t share signal with any other output...
  • Page 53 When connecting an optical device, make sure that its digital audio clock is phase-locked (in sync When the 1248 clock mode (item #14 on page 18) with) your MOTU interface, as explained in is set to S/PDIF, the 1248 resolves to the incoming “Synchronization”...

  • Page 54: A Typical 1248 Setup

    A TYPICAL 1248 SETUP recording, you can use the 1248’s on-board mixing Here is a typical 1248 studio setup. This rig can be to listen to what you are recording via the main operated without an external mixer. All mixing and outs, headphone outs, or any other output pair.

  • Page 55: A Typical 8M Setup

    A TYPICAL 8M SETUP on-board mixer to listen to what you are recording Here is a typical 8M studio setup. Like the 1248, via the headphone out or any output pair. You can this rig can be operated without an external mixer.

  • Page 56: A Typical 16A Setup

    16A back panel (send/return loop) Ethernet cable to another MOTU quarter-inch analog outs AVB device, a MOTU AVB Switch, or WiFi router, etc. Compressor, reverb or other outboard gear synths, samplers, effects units, etc. quarter-inch analog outs USB or Thunderbolt...

  • Page 57: Talkback

    ☛ TALKBACK You can route talkback to as many buses and/ Talkback allows an engineer in the control room to or groups as you wish. Route them to whatever temporarily dim all audio and talk to musicians physical outputs are needed for your particular during a recording session.

  • Page 58: Synchronization

    SYNCHRONIZATION Legend 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.

  • Page 59: Syncing S/Pdif Devices

    The 1248 S/PDIF input provides sample rate Device A conversion, which allows you to record any S/PDIF signal up to 96 kHz, even when the 1248 is resolved Device B to other clock sources besides S/PDIF. See “S/PDIF Figure 4-18: When transferring audio, two devices must have phase- with sample rate conversion”...

  • Page 60: Syncing Word Clock Devices

    (See below for Figure 4-20: Slaving another digital audio device to your MOTU device (a 1248 in this example) via word clock. For the 1248 clock how to specify the time code input.) This ensures...

  • Page 61: Syncing An Avb Network

    LTC from the interface to the computer. If all of 2 In the device list (item #1 on page 18), choose your computer channels are being used, you can the MOTU interface you wish to use as the clock add extra channels using the To computer setting in master.

  • Page 62: Syncing Multiple Avb Audio Interfaces Connected To A Mac

    MOTU AVB devices that don’t share the same master clock. Figure 4-23: Choosing a clock master. Resolving the master clock device to an external clock source The MOTU device you’ve specified as the AVB network clock master can itself be resolved to an external time base such as word clock or optical.
  • Page 63 Part 2 Using your MOTU interface...

  • Page 65: Presets

    Studio Output expander......68 Figure 5-1: Using your MOTU AVB device as an audio interface.

  • Page 66: Stand-Alone Mixer

    Audio inputs from stage, studio, etc. Audio inputs from stage, etc. Figure 5-3: Using your MOTU AVB device as an audio interface and Figure 5-2: Using your MOTU AVB device as a stand-alone mixer. This mixer, simultaneously. example demonstrates how you can control the mixer from several Wi-Fi devices.

  • Page 67: Live Recording With Monitor Mixing

    As another example, you could run an Ethernet Choose the Live recording with monitor mixing cable from the stage unit to a MOTU AVB Switch, preset when you are tracking in the studio. The with a host of other MOTU AVB interfaces and setup is pretty much the same as for the “Interface...

  • Page 68: Studio Output Expander

    This example the 1248 optical output to the optical input on shows 1248 interface inputs being routed to the other optical device, but you could also do the same thing for outputs, even simulta- another non-AVB MOTU audio interface, such as neously.

  • Page 69: The Front Panel Lcd

    In its default state when the unit is first powered on, inputs and outputs (except the phones). On the the LCD displays level meter activity for all 1248 and 8M, the LCD also provides horizontal physical audio inputs and outputs on the device. “long-throw” input metering when adjusting Inputs and outputs are labeled by channel number preamp gain.

  • Page 70: Push-Button Knobs

    When viewing a channel’s horizontal meter, push device, such as its name and connection mode its knob (on the 1248 or 8M) to “pin” the LCD’s (Thunderbolt, USB, or AVB). focus on the large meter view. The view is “pinned”...

  • Page 71: Network Menu

    They remain in effect even when the interface is not connected to a computer. This Settings menu allows you to use your MOTU device as a stand- The Settings menu provides access to basic alone mixer. You can make adjustments to any...
  • Page 72 T H E F R O N T P A N E L L C D...

  • Page 73: Preparation

    If you have devices connected to the optical ports, Choose the MOTU Pro Audio driver....74 see “Choosing a clock source for optical Reducing monitoring latency.

  • Page 74: Working With Host Audio Software

    Figure 7-1: Choosing the MOTU Pro Audio ASIO driver in Cubase. Monitoring through your MOTU interface If you don’t need to process a live input with plug-ins, the easiest way to avoid monitoring latency is to disable your DAW’s live monitoring...
  • Page 75 “speaks” to your computer in buffers, input to the mixer in your MOTU interface. This is rather than one sample at a time. The size of these done by opening the Mix In group in the Outputs...
  • Page 76 Figure 7-3: In Cubase or Nuendo, choose Devices menu > Device reduce monitoring latency, but significantly Setup. Select your interface (1248, 8M or 16A), then click the Control Panel button to access the window above and the Buffer Size setting.

  • Page 77: Working With The Routing Grid

    In the web app Routing tab (page 20), you can Configuration presets enable all input and output banks on your MOTU The presets menu (item #8 in the Devices tab on device that you wish to make available to your host page 18) provides many useful presets for various audio software.
  • Page 78 109. Figure 7-6: An example of routing computer channels (from host audio software) to physical outputs on a 1248. The two headphone outs are mirroring the main outs (channels 1-2 from the computer). In this example, 30 channels are being used for streaming from the host computer, but more can be added for streaming to the AVB network or the on-board 48-channel mixer in the 1248.
  • Page 79 Figure 7-7: An example of routing physical inputs on the 1248 to computer channels (for host audio software). In this example, S/PDIF input is on channels 23-24 going to the computer, and 24 channels total are being used for streaming to the host computer, but more can be added for other inputs from the mixer or AVB network, if any.

  • Page 80: Working With On-Board Mixing And Effects

    22. host software. If your host software requires that SYNCHRONIZATION you specify the port, you should see your MOTU You may encounter situations in which you need to interface SMPTE Sync port as an available option synchronize your audio software and your MOTU in the list.

  • Page 81: High Pass Filter

    Main Mix and Monitor channel strips ....25 The hardware mixer in your MOTU AVB interface Aux bus channel strips....... 26 provides several major advantages over mixing and Group and Reverb channel strips .

  • Page 82: Mixer Effects

    GATE Enabling EQ Each band has an enable/disable button All input channel strips provide a Gate module. (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. Enable/disable The gate silences the signal when the input signal’s level drops below the Threshold.

  • Page 83: Compressor

    sculpting. The four-band EQ has been designed to COMPRESSOR All mixer input channel strips provide a be flexible enough to cover a broad range of applications. By adjusting Gain and Bandwidth compressor module. 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...
  • Page 84 Gain reduction meter the signal to 2 dB above the Threshold. When the The Gain reduction meter (Figure 8-4) displays the input level goes above the threshold, the current amount of attenuation applied by the attenuation is added gradually to reduce distortion. compressor, before the makeup gain stage.

  • Page 85: Leveler

    Compressor graph Automatic gain control using light The Compressor graph below the Compressor The AGC circuit of the LA-2A uses a vintage opto- section (Figure 8-4) provides a thumbnail visual coupler known by its model number T4. The T4 indication of the current compressor settings for contains an electroluminescent-panel (ELP) and the input channel.

  • Page 86: Reverb

    It is precisely this self-adjusting behavior that REVERB Use the enable/disable button (Figure 8-7) to turn makes optical compressors the tool of choice for smoothing out vocals, bass guitar and full- the reverb processor on or off. Since reverb uses program mixes without destroying perceived considerable DSP resources, it is best to leave it off when you are not using it.
  • Page 87 first reflections return to the listener. Predelay is useful for adding clarity, as it delays these reflections, before the onset of full reverberation. For example, with pre-delay added to vocals, the reflections won’t start until after the initial sound of a word has been sung.
  • Page 88 M I X E R E F F E C T S...

  • Page 89: Motu Audio Tools

    Phase Analysis ........100 Figure 9-1: The MOTU Audio Tools window with the FFT and Spectrogram Analysis .

  • Page 90: Analysis Menu

    Left Input and Right Input menus (Figure 9-1). These menus display the To Computer FFT AND SPECTROGRAM DISPLAY channels configured in the MOTU Pro Audio The FFT analysis pane displays a real-time Fast Control web app. The number of channels shown is...
  • Page 91 Axes display View controls You can show and hide the FFT display and The Axes control (Figure 9-5) sets the opacity of spectrogram as desired using the View controls the grid displayed in the graph, from 100% (fully (Figure 9-5). visible) down to 0% (fully hidden).

  • Page 92: Oscilloscope

    OSCILLOSCOPE Vertical controls menu The Oscilloscope (Figure 9-9) graphs the amplitude of an audio signal over time. Figure 9-7: The Vertical controls. Amplitude is displayed on the y-axis and time is In Zoom/Offset mode, Zoom sets the display zoom displayed on the x-axis. A thick white vertical line from 1x to 100x, and Pos sets the center amplitude marks where time equals zero;...
  • Page 93 View menu Horizontal controls menu The View menu (Figure 9-10) lets you choose how to display the audio channel(s) being displayed. Figure 9-11: Horizontal controls. View menu settingWhat it displays Left Left channel only In Zoom/Offset mode, Zoom sets the display zoom Right Right channel only from 1/1000x to 10x, where the number represents...
  • Page 94 Type I recognition provides the most stable display right channel. One or both of these can be enabled of the waveform. It is the most resistant to change. simultaneously. If neither is enabled, the criteria Louder transients, such as those produced by a will not be found because the trigger is not looking snare drum, are not displayed inside of the at any audio signal.
  • Page 95 Trigger modes Trigger indicator re-arms the trigger. When the The Trigger menu (Figure 9-12) provides four Trigger mode is None, clicking on the Trigger modes: indicator has no effect. Measurement information Trigger mode What it does You can view detailed information about a None The Trigger is not active;...
  • Page 96 Building synthesizer patches snare hit, as you make adjustment the compressor, If you are building a synth patch on a synthesizer you can see the transient waveform change the next (or forming similar highly periodic audio time the Oscilloscope triggers. For compression, material), you can run the audio signal through the this can be particularly useful for balancing the Oscilloscope as you adjust its sound to check in real...

  • Page 97: X-Y Plot

    X-Y PLOT The higher the meter, the higher the correlation The X-Y Plot window (Figure 9-13) graphs the between the two channels. Below are a few amplitude of a stereo audio signal on a two- examples: dimensional grid. Situation Meter level X-Y Plot graph Mathematical relationship For each unit of time (i.e., each sample), the...
  • Page 98 View controls shown in white and then fades to gray. To adjust the The View controls (Figure 9-14) provide several scale of this color/brightness change, see “Decay” options for the X-Y Plot display. on page 99. Axes Pause button The Axes control (Figure 9-14) sets the opacity of the grid displayed in the graph, from 100% (fully visible) down to 0% (fully hidden).
  • Page 99 When warp is positive, they contract towards the origin (center of the grid). When warp is negative, they expand away from the origin. The further the warp value is from zero, the greater the effect. Figure 9-17: The Persistence controls. Using the X-Y Plot The X-Y Plot helps you “see”...

  • Page 100: Phase Analysis

    PHASE ANALYSIS View controls The View controls (Figure 9-20) provide several The Phase Analysis window (Figure 9-19) graphs options for the Phase Analysis display. frequency versus phase difference versus amplitude of a stereo signal on either rectangular or polar coordinates. Pause button In rectangular coordinates, the vertical axis represents frequency, and the horizontal axis...
  • Page 101 Line/Scatter Rectangular/Polar Choose either Line or Scatter from the menu in the Choose either Rectangular or Polar from the menu View section (Figure 9-20) to plot each data point in the View section (Figure 9-20) to control how as either a single pixel or as a continuous line that audio is plotted on the Phase Analysis grid.
  • Page 102 Max delta theta Horizontal and vertical controls The Horizontal and Vertical controls (Figure 9-24) Max delta theta (Figure 9-25) only affects Line let you scale each axis of the grid and offset its zero view (see “Line/Scatter” on page 101) and sets the point.
  • Page 103 Checking for phase issues in stereo tracks outside the critical frequency range of the You can use the Phase Analysis window to check instrument being recorded, you can avoid phase the overall polarity of a stereo mix. Figure 9-27 is problems among the mic signals.
  • Page 104 M O T U A U D I O T O O L S...

  • Page 105: About Avb

    The MOTU AVB Switch ......110...

  • Page 106: Networking

    Although the web app shares the network with AVB, AVB audio streams are never compromised Up to 256 channels of host I/O — MOTU AVB ■ because AVB streams over the network traffic. interfaces (depending on the model) can support Bridging to standard Ethernet —...
  • Page 107 Personal studio expansion Large studio facility Let’s say you have a 1248 mounted in a rack next to In a larger studio facility, you could build audio your computer. You could add an 8M interface and network neighborhoods similar to the studio...

  • Page 108: A Quick Guide To Networking

    Networks of three or more interfaces require an ■ AVB-compatible switch. You can use any standard AVB switch on the market. MOTU offers the five- port MOTU AVB Switch™ (sold separately). AVB audio can’t pass through more than seven ■...

  • Page 109: Setting Up A Motu Avb Interface For Networking

    If a host computer is connected to an interface (through Thunderbolt or USB), mapping network 1 In the MOTU Pro Audio Control web app, input and output streams is accomplished as choose the device (item #1 on page 18).

  • Page 110: Device Presets And Avb Stream Connections

    DEVICE PRESETS AND AVB STREAM CONNECTIONS When you save a preset for a MOTU device (item 8 on page 18), any AVB stream connections that it has established with other devices on the network are now included with the saved preset. When you...

  • Page 111: Part 3: Appendices

    Part 3 Appendices...

  • Page 113: Troubleshooting

    Troubleshooting APPENDIX Some or all of my MOTU interface inputs and The Routing tab (page 20) doesn’t display some of outputs are not available in my host audio the inputs or outputs on my interface. software. The Routing tab only displays input and output...
  • Page 114 MOTU solve your problem as quickly as possible: interface. If you encounter the same artifacts you The serial number of your MOTU device. This is may want try using another drive in your ■...

  • Page 115: Audio Specifications

    Audio Specifications APPENDIX 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.
  • Page 116 S/PDIF Includes Sample Rate Conversion (SRC) on input Connector Type 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...
  • Page 117 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...
  • Page 118 Word Clock In/Out/Thru Specification AES-11 2009 Annex B Jack Type 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...
  • Page 119 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...
  • Page 120 A P P E N D I X B : A U D I O S P E C I F I C A T I O N S...

  • Page 121: Mixer Schematics

    Mixer Schematics APPENDIX MONO INPUT CHANNEL...
  • Page 122 STEREO INPUT CHANNEL A P P E N D I X C : M I X E R S C H E M A T I C S...
  • Page 123 GROUP BUS A P P E N D I X C : M I X E R S C H E M A T I C S...
  • Page 124 MONITOR BUS A P P E N D I X C : M I X E R S C H E M A T I C S...

  • Page 125: Updating Firmware

    You are now ready to update: 2 Transfer the file to a computer with a network cable connection to your MOTU interface. Figure D-1: The firmware update banner appears across the Device tab when your web host has internet access and MOTU posts an update.
  • Page 126 Updating multiple interfaces on a network You can confirm the firmware version at the If you have two or more MOTU interfaces on a bottom of the Device tab (Figure D-5). network, you can update their firmware all at once.

  • Page 127: Osc Support

    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...
  • Page 128 A P P E N D I X E : O S C S U P P O R T...

  • Page 129: Index

    +4dB analog input Enable inputs Enable Jam Sync Balanced analog Enable outputs Become Clock Master 18, 61 -10dB analog input 18, 38 Buffer Size 1248 enabling expansion filter types front panel frequency 15, 43 CAT-5e/6 cables installing gain Check for Updates...
  • Page 130 Logic Pro/Express Compressor clock source 73, 74 Reaper sample rate 105-110 Networking Reason Lookahead 44, 45 installation Propellerhead Reason MOTU AVB Switch Reboot Input Source Nuendo 73, 74 Registration Setup clock source Release to MTC conversion sample rate Compressor 82, 84...
  • Page 131 Sample rate 33, 105 conversion Type II (Legacy) optical setting Samplers 54, 55, 56 connecting Unbalanced analog SC button Update From File 19, 126 Schematics Set password class compliance SMPTE installing drivers sync time code Soft Clip View Personal Mix 7, 17, 37 Software installer 52, 69...
  • Page 132 I N D E X...

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