PowerBass ATM 440.2 User Manual

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ATM COMPACT CLASS A/B AMPLIFIER

Owners Manual

Please read through this manual to familiarize yourself with your new ampliﬁer. Should your PowerBass

AutoSound mobile ampliﬁer ever require service, you will need to have the original dated receipt.

ATM 330.2

ATM 440.2

ATM 550.4

ATM 660.4

Table of Contents

Questions and Answers:

N
nandrewsAug 8, 2025
What to do if the red status protection LED is ON and there is no output from my PowerBass ATM 440.2 Amplifier?
- C
  Christy MccormickAug 8, 2025
  The red status protection LED indicates a problem that needs attention. Several issues could be the cause: * If the amplifier is very hot, the thermal protection may be engaged. Check the speaker terminals for proper impedance and ensure adequate airflow around the amplifier. * If the amplifier shuts down only when the vehicle is running, the voltage protection may be engaged. This means the voltage to the amplifier is outside the 10-16 VDC operating range. Have the battery/charging system inspected. * If the amplifier plays at a very low volume, the short circuit protection might be engaged. Inspect the speaker wires for shorts to each other or the vehicle's chassis. Also, using speakers with impedance below the minimum can trigger this.
L
Logan EstradaAug 13, 2025
Why is there alternator noise (varies with RPM) coming from my PowerBass ATM 440.2 Amplifier?
- W
  William StanleyAug 13, 2025
  Alternator noise that changes with RPM can be caused by several factors. Check for the following: * Damaged RCA cables * Improper routing of the RCA cables * A poor ground connection at the source unit * An amplifier gain setting that is too high (reduce the gain if it is) * A chassis ground short on the speakers
W
wongtylerAug 19, 2025
How to fix poor bass response on PowerBass ATM 440.2 Amplifier?
- I
  ibowmanAug 19, 2025
  To improve poor bass response, check the speaker polarity. Try reversing the connection of only one speaker.
W
Wendy RiceAug 26, 2025
What to do if the Power LED lights BLUE but there is no output from my PowerBass ATM 440.2 Amplifier?
- R
  Ronnie CarterAug 26, 2025
  If the power LED is blue but there's no output, try these steps: * Check the RCA connections. * Test the speaker outputs with a known good speaker. * Substitute a known good source unit. * Check for a signal on the RCA cable using a VOM (Volt Ohm Meter) in AC position.
A
Andre JamesAug 31, 2025
How to troubleshoot a PowerBass ATM 440.2 when the power LED is not ON?
- B
  Breanna OsborneAug 31, 2025
  Using a Volt Ohm Meter (VOM), check the following: * +12 Volt power terminal (should read +12 to +16VDC) * Remote turn-on terminal (should read +12 to +16VDC) * Ground Terminal

PowerBass ATM 440.2 Specifications

General

Channels	2
RMS Power @ 4 Ohms	110W x 2
RMS Power @ 2 Ohms	220W x 2
Bridged RMS Power @ 4 Ohms	440W x 1
THD at Rated Power	<0.05%
Signal to Noise Ratio	>90dB
Damping Factor	>200
Input Sensitivity	200mV - 6V
Crossover Range	50Hz - 250Hz
Bass Boost	0-12dB
Crossover Slope	12dB/octave

Summary

Welcome and Product Overview

Product Line Introduction

Introduces the PowerBass Autosound COMPACT A/B CLASS FULL RANGE AMPLIFIERS.

Technical Features

Installation Experience and Preparation

Preparing for Installation

Lists necessary tools and pre-installation considerations for PowerBass amplifiers.

Installation Precautions and Mounting

Mounting the Amplifier

Guidance on proper location and mounting techniques for optimal performance and cooling.

Mounting Location Guidelines

Specifies ideal locations and considerations for mounting the amplifier safely and effectively.

General Safety Warnings

Crucial safety advice covering installation placement, power connections, and potential hazards.

Control Panel Layout and Functions

Line Input and Gain Controls

Details on RCA input jacks and the gain control for matching source unit sensitivity.

High Input and Bass EQ Switch

Explains high-level input connection and the bass equalization feature.

Filter and Crossover Controls

Description of LPF, HPF, and X-OVER controls for frequency adjustments.

Indicators and Terminals

Information on power/status indicators, speaker outputs, fuses, and power/ground/remote terminals.

Power and Signal Wiring Connections

Power Wiring

Guidelines for connecting the amplifier's power input, including fuse placement.

Grounding the Amplifier

Instructions on securing a proper chassis ground connection for optimal performance.

Remote Trigger Connection

Details on connecting the remote turn-on lead for amplifier activation.

RCA Interconnect Wiring

High Level Connections (Optional)

Setup Adjustments Guide

Input Gain Adjustment

Step-by-step guide for setting amplifier input sensitivity to avoid distortion.

Bass EQ and High Pass Filter Setup

Instructions for using the Bass EQ and HPF controls for sound tuning.

Low Pass Filter Adjustment

How to adjust the LPF for subwoofer operation and speaker wiring guidelines.

Speaker Wiring and Configurations

Speaker Load Requirements

Details on minimum impedance requirements for safe and optimal amplifier operation.

2-Channel Speaker Output Connections

2-Channel Speaker Output

Diagram and instructions for connecting speakers in 2-channel stereo mode.

1-Channel (Bridged Mode) Speaker Output

Diagram and instructions for connecting speakers in 1-channel bridged mode.

4-Channel Speaker Output Connections

4-Channel Speaker Output

Diagrams and instructions for connecting speakers in 4-channel stereo mode.

Multi-Channel Speaker Configurations

3-Channel Stereo/Mono Output

Wiring for 3-channel configurations using 4-channel models.

2-Channel (Bridged) Output on 4-Channel

Wiring for 2-channel bridged configurations on 4-channel models.

Recommended Wire Sizes

Power Cable Selection Chart

Table providing recommended wire gauges based on fuse size and wire length.

Troubleshooting Common Issues

Amplifier Specifications

Limited Warranty Policy

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