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Alto D1 User Manual

Alto D1
16 pages
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D1/D2/D3/D4
PROFESSIONAL POWER AMPLIFIERS
OWNER'S MANUAL
www.altoproaudio.com
Version 1.3 SEPTEMBER 2007
LTO
R
English

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Alto D1 Specifications

General IconGeneral
BrandAlto
ModelD1
CategoryAmplifier
LanguageEnglish

Summary

Important Safety Instructions

Introduction

Features

Illuminated Power Switch

Controls power and indicates amplifier status with illumination.

Automatic Clip-limiter Circuit

Prevents distortion by limiting output signal peaks.

Switchable Low-Frequency Filter

Improves bass performance by filtering subsonic frequencies below 30Hz.

Operating Modes

Supports Stereo, Parallel, or Bridge operational configurations.

Input Connectors

Features balanced combo connectors accepting XLR or 1/4" TRS.

Output Connectors

Provides Speak-on jacks and binding posts for speaker connections.

Cooling Fan

Ensures optimal cooling with speed adjusted by temperature.

Front Panel LED Indicators

Displays Signal, Clipping, and Protection status on the front panel.

Class D Technology

Utilizes Class D technology for high power and lightweight design.

Manufacturing Certification

Manufactured under TS16949 and ISO14001 certified management systems.

Control Elements

Front Panel Controls

Details the front panel elements for operation and monitoring.

POWER SWITCH & INDICATOR LED

Controls power and provides status indication.

SIGNAL LED

Indicates signal presence at the output.

CLIP LED

Warns of audio distortion by flashing.

PROTECTION LED

Signals an active protection mode.

GAIN CONTROLS

Adjusts output signal levels.

COOLING VENTS

Facilitates front-to-back airflow.

Rear Panel Controls

Details the rear panel connections and operational settings.

CIRCUIT BREAKER

An electronic fuse that disconnects power when overloaded or overheated.

IEC Socket for AC Power Cable

Connection point for the main power cord.

COMBO BALANCED INPUT CONNECTORS

Accepts balanced XLR or 1/4" TRS signals for input.

SPEAKON OUTPUTS

Connectors for high-power speakers, ensuring correct polarity.

BINDING POST OUTPUTS

Terminals for speaker connection, requiring careful polarity matching.

Low Frequency Filter

Rolls off signals below 30Hz to improve bass response.

Output Mode Selector

Allows switching between Stereo, Parallel Mono, and Bridged modes.

Cooling Fan

Provides essential cooling, with speed regulated by device temperature.

Operation Modes

Stereo Mode

Operates channels independently for stereo output.

Parallel Mode

Uses one input signal to drive both channels for mono output.

Bridged Mode

Combines both channels for maximum power output to a single speaker.

Block Diagram

Technical Specifications

Warranty

Warranty Registration Card

Information required for obtaining warranty service.

Return Notice

Instructions for returning the product for service.

Terms and Conditions

Details the warranty period, coverage, and exclusions.

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