M-Audio Duo User Manual

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
What’s in the Box? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Quick Start Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Duo Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Minimum System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Front Panel: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Back Panel: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Bottom of Unit: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Basic Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Hardware & Software Installation on the PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Windows XP Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Windows 2000 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Windows ME Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Hardware & Software Installation on the Mac . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Hooking up your USB Audio Duo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Using the Input and Output Level Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Using the Mic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Setting the Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Phantom Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Using the Pad Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Standalone Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Duo Operation on the PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
The USB Audio Configuration Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
The Duo and the Windows Sound System . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
The Duo, MME, and Your Music Program . . . . . . . . . . . . . . . . . . . . . . . . . . .16
ASIO/EASI Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
ASIO/EASI Control Panel and Operating Modes on the PC . . . . . . . . . . . . . .17
Advanced Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Duo Operation on the Macintosh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
The Macintosh Sound Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
ASIO Operation on the Macintosh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
ASIO Control Panel and Operating Modes on the Mac . . . . . . . . . . . . . . . . . .21
Optimizing Your System for USB Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Troubleshooting: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Before You Call Midiman/M-Audio Technical Support . . . . . . . . . . . . . . . . . .25
Limited Lifetime Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
AUDIO
TM
DUO
TM
Users Manuual

M-Audio Duo Specifications

General

Type	Audio Interface
Channels	2
Outputs	2 x 1/4" TRS
MIDI I/O	No
Phantom Power	Yes
Headphone Output	1 x 1/4" TRS
Frequency Response	20 Hz - 20 kHz
Inputs	2 x XLR-1/4" combo
Signal-to-Noise Ratio	100dB

Summary

Introduction to the Duo

What's in the Box?

Lists the items included in the Duo package.

Quick Start Guide

Outlines the initial steps for setting up and using the Duo.

Duo Features and Specifications

Performance Specifications

Details the technical performance metrics of the Duo, such as dynamic range and THD+N.

Minimum System Requirements

Specifies the necessary hardware and software configurations for PC and Mac.

Front Panel Controls Overview

Input Level and Pad Switches

Explains the function of the line level input switch and pad switches on the front panel.

Gain and Indicator LEDs

Describes the gain controls and the signal/clip indicator LEDs for each input.

Standalone and Monitoring Controls

Details the standalone mode switch, headphone output jack, and headphone level control.

Power and Phantom Power Controls

Covers the main power switch and the phantom power switch with their respective LEDs.

Back Panel Connections

Power and USB Ports

Identifies the power input jack and the USB connector for system connection.

Digital and Analog Outputs

Describes the S/PDIF output, line outputs, and the line level output switch.

Analog Inputs

Explains the line inputs and microphone inputs on the back panel.

Bottom Unit DIP Switches

Sample Rate Configuration

Details how to set the sample rate using DIP switches when the unit is in standalone mode.

Basic Theory of Operation

PC Hardware & Software Installation

Windows XP Installation

Step-by-step guide for installing Duo drivers and software on Windows XP.

Windows 2000 Installation

Step-by-step guide for installing Duo drivers and software on Windows 2000.

Windows ME Installation

Step-by-step guide for installing Duo drivers and software on Windows ME.

Windows 98 SE Installation

Step-by-step guide for installing Duo drivers and software on Windows 98 SE.

Mac Hardware & Software Installation

Installing Duo Drivers on Macintosh

Instructions for installing the Duo's ASIO driver and related components on a Mac.

Hooking Up Your USB Audio Duo

Connecting Audio Devices

Guidance on connecting microphones, line-level instruments, and monitoring systems to the Duo.

Input and Output Level Switches

Explains how to adjust the line level for inputs and outputs for compatibility.

Using the Mic Inputs

Setting the Gain

Phantom Power

Using the Pad Switch

Standalone Mode Operation

Duo Operation on the PC

USB Audio Configuration Manager

How to use the control panel to select ASIO/EASI or MME drivers for PC operation.

Duo and Windows Sound System

Configuring the Duo to work with the Windows Sound System for general audio playback.

Duo, MME, and Your Music Program

Using the Duo with music software that supports MME drivers.

ASIO/EASI Operation

ASIO/EASI Control Panel PC

Accessing and configuring the Duo's ASIO/EASI driver settings on a PC.

ASIO Control Panel Settings

Details available channel sets, bitwidth, and sample rates in the ASIO control panel.

ASIO Control Panel Sample Rates

Explains how channel selection and bit depth affect available sample rates, including 96kHz.

Duo Operation on the Macintosh

Macintosh Sound Manager

Configuring the Duo to use the Mac's built-in Sound Manager for audio.

Advanced Tab Settings

Adjusting advanced settings like thread priority and optimizing for slower systems.

ASIO Operation on the Macintosh

ASIO Control Panel Mac

Mac ASIO Settings and Bandwidth

Explains how channel selection and bit depth affect bandwidth and sample rate on Mac.

Optimizing Your System for USB Audio

System Optimization Tips

Provides advice on improving audio performance by optimizing system settings and hardware.

Troubleshooting Common Issues

No Sound or Error Messages

Addresses common problems like no audio output or driver error messages.

Ticking Sound and USB Interference

Helps diagnose and resolve ticking sounds potentially caused by USB interference.

Before Calling Technical Support

Using M-Audio Resources

Guides users to find information through M-Audio's read-me files and website.

Gathering Essential Information

Lists the information needed to provide to technical support for efficient troubleshooting.

Appendix A - Technical Specifications

Limited Lifetime Warranty

Notes