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PowerBass ATM 330.2 - User Manual

PowerBass ATM 330.2
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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

  • D
    dhollandJul 31, 2025
    What to do if the red status protection LED is ON and there is no output from my PowerBass ATM 330.2 Amplifier?
    • B
      Brandon PhillipsJul 31, 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.
  • W
    William KellerAug 6, 2025
    Why is there alternator noise (varies with RPM) coming from my PowerBass Amplifier?
    • M
      Michael GoodwinAug 6, 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
  • J
    Jacqueline FernandezAug 12, 2025
    How to fix poor bass response on PowerBass ATM 330.2 Amplifier?
    • P
      phelpsmariaAug 12, 2025
      To improve poor bass response, check the speaker polarity. Try reversing the connection of only one speaker.
  • P
    potterhelenAug 18, 2025
    What to do if the Power LED lights BLUE but there is no output from my PowerBass Amplifier?
    • M
      Mark DiazAug 18, 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.
  • L
    Laura PalmerAug 25, 2025
    How to troubleshoot a PowerBass ATM 330.2 Amplifier when the power LED is not ON?
    • C
      Clifford YoungAug 25, 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

Summary

ATM COMPACT CLASS A;B AMPLIFIER Owners Manual

Installation Guide

Preparation for Installation

Lists necessary tools and provides preparation notes before starting installation.

Installation Precautions and Mounting

General Installation Precautions

Outlines essential safety measures and procedures before beginning installation.

Mounting the Amplifier

Mounting Location and Safety Warnings

Critical Mounting Warnings

Highlights crucial warnings regarding amplifier placement and potential hazards.

Control Panel Functions

BATT+ (Power Input Connection)

Details the main power input connection to the vehicle battery.

REM (Remote Input Connection)

Explains how to connect the remote turn-on lead for amplifier activation.

GND (Ground Input Connection)

Describes the requirements for a proper ground connection for optimal performance.

Power Wiring and Signal Connections

Power Cable Selection

Power Wiring Details

BATT+ (Power) Wiring

Details the direct connection of the power wire to the vehicle battery.

GND (Ground) Connection

Explains how to establish a proper ground connection to the vehicle chassis.

Remote Trigger Connection

REM Terminal Connection

Explains connecting the remote turn-on lead to activate the amplifier.

Setup Adjustments

Input Gain Adjustment

Guides users on setting the amplifier's input sensitivity for optimal sound.

Speaker Wiring and Configurations

Speaker Load Requirements

Specifies minimum impedance requirements for stereo and bridged mono operation.

Speaker Wiring Procedure

Troubleshooting Tips

PowerBass Autosound Limited Warranty Policy

PowerBass ATM 330.2 Specifications

General IconGeneral
Channels2
THD at Rated Power<0.05%
Signal to Noise Ratio>90dB
Damping Factor>200
Input Sensitivity200mV - 6V
Crossover Slope12dB/octave
Bass Boost0-12dB
Bass Boost Frequency45Hz
Fuse Rating25A
Power Output @ 4 Ohms80W x 2
Low Pass Crossover40Hz - 250Hz
High Pass Crossover40Hz - 250Hz

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