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Boston Acoustics GT-42 User Manual

Boston Acoustics GT-42
19 pages
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GT-42
4-Channel, High-Current/High-Power Amplifier
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Boston Acoustics GT-42 Specifications

General IconGeneral
Channels4
Frequency Response20Hz - 20kHz
THD at Rated Power<0.05%
Signal to Noise Ratio>90dB
Input Sensitivity0.25V - 5V
Crossover Frequency50Hz - 200Hz
Signal-to-Noise Ratio>90dB
Bass Boost0dB - 12dB @ 45Hz

Summary

Parts List

Features and Specifications

GT-42 Features Overview

Details on the amplifier's key features and capabilities.

GT-42 Technical Specifications

Provides detailed technical specifications including power ratings and dimensions.

Control Functions

Front RCA and Remote Inputs

Explains connection and function of front RCA inputs and remote turn-on.

Front Input Switch and Sensitivity

Details the front input switch function and adjusting front input sensitivity.

Front Highpass Crossover Controls

Describes how to set and adjust the front channel highpass crossover.

Front Q Control

Adjusts the Q-factor for the front channel highpass crossover.

Rear RCA and Remote Inputs

Details rear RCA inputs and the secondary remote input connection.

Rear Input Switch and Lowpass Crossover

Covers the rear input switch and lowpass crossover slope/frequency settings.

Status LED Indicators

Explanation of the amplifier's status LED indicators and their meanings.

Subwoofer Level Control and Port

Information on the subwoofer level control and its port.

Mechanical Functions

Recessed RCA Inputs

Describes the benefit of recessed RCA inputs for tight mounting.

Control Cover Removal and Reinstallation

Instructions for removing and reinstalling the amplifier's control cover panel.

Multi-position Mounting Feet

Details the design and use of the amplifier's adjustable mounting feet.

Vents (Side and Rear)

Emphasizes the importance of keeping cooling vents clear.

Amplifier Linking

Explains how to link multiple amplifiers together.

Wire Connection Specifications

Details wire gauge requirements for amplifier connections.

Fuse Type

Specifies the type of fuses accepted by the amplifier.

General Installation Precautions

Mounting Surface Warnings

Advises caution when driving mounting screws to avoid hidden hazards.

Pre-installation Battery Disconnection

Recommends disconnecting the negative battery cable before installation.

Vehicle Electrical System Check

Stresses the need to check the vehicle's battery and charging system capacity.

Wire Routing Best Practices

Guidance on routing wires to prevent noise interference and damage.

Amplifier Mounting

Choosing the Mounting Location

Guidance on selecting an appropriate location for amplifier installation.

Passenger and Trunk Compartment Mounting

Specific advice for mounting the amplifier in seats or trunks.

Fuses and Wiring

Amplifier and Inline Fuses

Information on internal amplifier fuses and recommended inline fusing.

Recommended Wire Gauge

Details the recommended wire gauge for power and ground connections.

Power and Ground Connections

Instructions for making secure power (B+) and ground (GND) connections.

Remote Input Connection Procedure

Steps for connecting the remote turn-on lead to the amplifier.

Speaker Output Connections

Guide on connecting speaker wires to the amplifier outputs.

Mono Subwoofer Operation

Instructions for connecting a subwoofer using bridged rear channels.

Setup Tuning - Full-Range Speakers

Music Selection for Setup

Advice on choosing appropriate music for system tuning.

Initial Sensitivity Control Settings

Instructions for setting front and rear input sensitivity controls to minimum.

Initial Crossover Control Settings

Guidance on setting crossovers to 'OFF' for full-range signal.

Head Unit and Volume Setup

Configuring head unit settings and adjusting volume for optimal signal.

Front Input Sensitivity Adjustment

Detailed steps for adjusting front input sensitivity for undistorted output.

Front Crossover and Q Control Adjustment

Procedure for setting front highpass crossover and Q control.

Rear Input Sensitivity and Crossover

Setting rear channel sensitivity and crossover controls.

Setup Tuning - Rear Fill Speakers

Rear Fill Configuration Options

Explains setting rear channels for summed mono operation for rear fill.

Setup Tuning - Subwoofers

Subwoofer Level Control Setting

Instructions for setting the subwoofer level control when not in use.

Rear Input Switch for Subwoofers

Configuring the rear input switch for mono subwoofer operation.

Head Unit and Volume for Subwoofers

Setting head unit and volume levels for subwoofer tuning.

Rear Input Sensitivity for Subwoofers

Adjusting rear input sensitivity for optimal subwoofer output.

Rear Crossover and Phase Settings

Setting the rear lowpass crossover and adjusting subwoofer phase.

System Examples

System A: Full-Range Front/Rear

Wiring diagram for a system with full-range front and rear speakers.

System B: Full-Range Front/Rear Fill

Wiring diagram for a system with full-range front and rear fill speakers.

System C: Main Speakers with Subwoofer (2Ω)

Wiring diagram for a system with main speakers and a single 2-ohm subwoofer.

System D: Main Speakers with Parallel Subwoofers (2Ω)

Wiring diagram for a system with main speakers and parallel 4-ohm subwoofers.

Amplifier Troubleshooting Guide

No Status LEDs or Head Unit On

Troubleshooting steps when amplifier LEDs are off but head unit is on.

No Output with Lit Status LEDs

Diagnosing issues when amplifier LEDs are lit but no sound from speakers.

Engine Noise from Speakers

Steps to identify and resolve engine noise interference.

Distorted Amplifier Output

Troubleshooting distorted audio output from the amplifier.

Amplifier Shuts Down (Thermal Protection)

Identifying causes for amplifier shutdown due to thermal protection.

Amplifier Not Turning On (Red LED)

Troubleshooting amplifier not powering on with a red LED indicator.

Contact and Warranty Information

Limited Warranty Details (US)

Overview of the limited warranty terms and conditions for US customers.

Service and Support Contact

Information on how to obtain service or support for the amplifier.

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