M-Audio USB Audio Duo

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
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Users Manuual

M-Audio USB Audio Duo Specifications

General

Brand	M-Audio
Model	USB Audio Duo
Category	Network Card
Language	English

Summary

Introduction and Setup

Introduction

Overview of the M-Audio Duo's features and benefits.

Whats in the Box?

Lists all items included with the Duo audio interface.

Quick Start Guide

Basic steps to get the Duo connected and operational quickly.

Duo Features and System Requirements

Duo Key Features

Highlights the primary features like mic preamps and connectivity.

Performance Specifications

Details technical metrics such as dynamic range and THD+N.

Minimum System Requirements

Lists necessary hardware and OS for Mac and Windows.

Front Panel Controls

Input Level, Pad, and Gain Controls

Controls for input signal attenuation, line level, and preamp gain.

Signal Indicators and Standalone Mode

LEDs for signal status and the switch for standalone operation.

Headphone Output and Power Functions

Headphone jack, level control, phantom power, and main power switch.

Back Panel Connections

Power, USB, and Digital Output Ports

Ports for power supply, computer connection, and S/PDIF output.

Analog Inputs, Outputs, and Level Switches

1/4" jacks for line I/O, and switches for operating line level.

Microphone Input Details

Balanced XLR inputs for microphones, supporting phantom power.

Unit Configuration and Basic Operation

Bottom Unit DIP Switches

DIP switches for setting sample rates in standalone mode.

Basic Theory of Operation

How the Duo functions as a 2x2 audio interface and A/D converter.

PC Hardware & Software Installation

Windows XP Installation

Complete guide for installing Duo drivers and software on Windows XP.

Windows ME Installation

Complete guide for installing Duo drivers and software on Windows ME.

Windows 98 SE Installation

Complete guide for installing Duo drivers and software on Windows 98 SE.

Macintosh Hardware & Software Installation

Connecting Your USB Audio Duo

Using Input and Output Level Switches

Microphone Input and Gain Settings

Using the Microphone Inputs

Details on connecting and using low-impedance microphones.

Setting the Gain Level

Guide to adjusting preamp gain for optimal signal and avoiding clipping.

Advanced Features: Phantom Power and Standalone Mode

Phantom Power Application

How to enable 48V phantom power for condenser mics.

Using the Pad Switch

Attenuating hot input signals with the 20dB pad switch.

Standalone Mode Options

Using the Duo as A/D converter, preamp, or for direct monitoring.

PC Operation: USB Audio Configuration Manager

Duo with Windows Sound System

Music Program Driver Compatibility

MME Drivers and Music Programs

Using MME drivers with Windows music applications.

ASIOEASI Driver Benefits

Advantages of ASIO/EASI for low-latency monitoring.

PC ASIOEASI Control Panel and Modes

PC Advanced Settings and Mac Operation

Advanced Tab for PC ASIO

Adjusting ASIO settings for USB bandwidth and latency on PC.

Macintosh Sound Manager Use

Using the Duo with the Mac's system sound manager.

Macintosh ASIO Operation and Control Panel

Optimizing Your System for USB Audio

Troubleshooting Common Issues

No Sound and ASIO Driver Errors

Resolving no audio output and ASIO driver error messages.

System Sound Monitoring Issues

Troubleshooting lack of system sound playback through the Duo.

Ticking Sound Resolution

Diagnosing and fixing audio ticking or popping sounds.

Preparing for Technical Support

Utilizing M-Audio Support Resources

Guides on using manuals, website, and README files for help.

Gathering Essential Information for Support

Key details to provide when contacting technical support.

Appendix A: Technical Specifications

Limited Lifetime Warranty