Grace m903 User Manual

Owner’s Manual Rev A
all contents © Grace Design / Lunatec LLC
2434 30th Street, Boulder, CO 80301 USA
www.gracedesign.com / 303.443.7454
m903 reference headphone amplier / DAC / monitor controller

Grace m903 Specifications

General

Brand	Grace
Model	m903
Category	Amplifier
Language	English

Summary

Important Safety Information

General Safety Precautions

General safety guidelines for indoor use, avoiding liquids, and electrical specifications.

Safety Marking Symbols

Explains caution and warning symbols for important instructions and electrical shock hazards.

Service Information

Details on user-unserviceable components and contacting Grace Design for repairs.

m903 Key Features

Frontpanel Controls and Features

Overview of the m903's front panel layout, buttons, LEDs, and display functions.

m903 Rearpanel and Initial Setup

Rearpanel Connector Overview

Unpacking and Installation Guide

Powering up the m903

Power Connections and Voltage Settings

Covers power cord connection, line voltage selection, and low voltage detection features.

Power-Up Sequence

Input/Output Connections

Input Connection Details

Describes balanced/unbalanced analog, AES3, S/PDIF, TOSLINK, and USB input connections.

Output Connection Details

Explains headphone and balanced/unbalanced line output connections, including wiring diagrams.

USB Audio and Computer Configuration

Asynchronous USB Audio Technology

Explains the benefits of asynchronous mode USB DAC for reduced jitter and improved audio.

Computer Audio Requirements

Advanced Features Overview

About S-LOCKTM Circuitry

Accessing the Setup Menu

Guide on how to enter and navigate the m903's setup menu using the front panel encoder.

Infrared Wireless Remote Control Operation

Remote Control Button Functions

Specifications

Analog Input Specifications

D/A Converter and Output Specs

Warranty Information

Warranty Terms and Conditions

Outlines the 5-year warranty, exclusions, service process, and legal rights.