Altec Lansing 641 User Manual (English)

Questions and Answers:

K
kbrownAug 14, 2025
What to do if there is no sound from Altec Lansing 641 Speaker System?
- C
  Cody AndersonAug 14, 2025
  If you're not getting any sound from your Altec Lansing speaker system, first, check that the AC power cord from the subwoofer is properly connected to the wall outlet. Then, ensure the master volume isn't set too low by turning the rotary knob to the right. Also, verify the audio cable is securely connected to both the audio source and the subwoofer, making sure it's plugged into the correct jacks. If using a 3.5 mm stereo jack, confirm it's fully inserted into the line-out jack of your audio source. Finally, test the speakers with another audio device to rule out issues with the original source.
B
Benjamin AlvarezAug 17, 2025
How to fix Altec Lansing Speaker System when all LEDs are unlit?
- T
  Teresa FarrellAug 17, 2025
  If all the LEDs on your Altec Lansing speaker system are unlit, start by pressing the Power On button on the System Controller. Check that the AC cord is connected to the wall outlet and that the LED on the rear of the subwoofer is illuminated. If you're using a surge suppressor, ensure it's switched on. Verify the System Controller is properly connected to the Subwoofer. Finally, plug another device into the same wall outlet to ensure it's functioning correctly.
M
Matthew SmithAug 20, 2025
Why is there no sound from my Altec Lansing 641 subwoofer?
- J
  Jacob StephensAug 20, 2025
  If you're not getting any sound from the subwoofer of your Altec Lansing speaker system, first, check the subwoofer volume control and adjust it to increase the volume. If your model has a Bass Selector, adjust it and raise the volume level. If you are listening to .WAV files, try a CD, because .WAV files often have little low frequency content. Finally, power off the Altec Lansing speaker system and unplug the subwoofer. Check the fuse and replace it with a T2A (2 amp @ 250 Volt) "SLO BLO" fuse if it's blown.
D
Daniel HarrisonAug 25, 2025
How to resolve distorted sound on Altec Lansing Speaker System?
- E
  Erin EwingAug 25, 2025
  If the sound from your Altec Lansing speaker system is distorted, try decreasing the master volume level. If you are using a computer sound card, try a different sound source like a music CD because .WAV files are often of poor quality.
M
Maria AndersonAug 27, 2025
What to do if there is too much bass or the subwoofer is distorted on Altec Lansing 641?
- T
  trujillobrandiAug 27, 2025
  If you're experiencing too much bass or distortion from the subwoofer on your Altec Lansing speaker system, push the Bass button on the System Controller and decrease the level.
D
Dr. Curtis YoungAug 31, 2025
How to fix no sound from rear satellites in Altec Lansing 641 Speaker System?
- R
  Rachel PatelAug 31, 2025
  To fix the issue of no sound from the rear satellites in your Altec Lansing speaker system, press the Mode button on the System Controller to select either Stereo x2 or Gaming Mode. Also, increase the Rear Volume level.
A
Adam SalasSep 3, 2025
How to increase treble on Altec Lansing 641 Speaker System?
- C
  carterwilliamSep 3, 2025
  To increase the treble on your Altec Lansing speaker system, push the Treble button on the System Controller and increase the level.
A
Angela HallSep 6, 2025
How to decrease treble on Altec Lansing Speaker System?
- A
  Abigail CarneySep 6, 2025
  To decrease the treble on your Altec Lansing speaker system, push the Treble button on the System Controller and decrease the level.
M
mary59Sep 9, 2025
What to do if the Altec Lansing 641 controller does not work?
- D
  Derek BryantSep 9, 2025
  If the controller for your Altec Lansing speaker system isn't working, verify the gray DIN connector is firmly inserted into the DIN jack on the Subwoofer. Ensure the pins are aligned from plug to jack.

Altec Lansing 641 Specifications

General

Signal-to-Noise Ratio	>75 dB
Frequency Response	20 kHz
Subwoofer	100W
Inputs	Stereo RCA
Controls	Master volume

Summary

Safety and Warranty Information

Damage Requiring Service

Identifies conditions requiring professional repair for product safety.

Servicing Guidelines

Instructions for users regarding product servicing and qualified personnel.

FCC Compliance Information

Details on FCC rules and compliance for digital devices.

One Year Limited Warranty

Outlines the warranty terms and conditions for the speaker system.

Connecting the Power Cord

Introduction to the Speaker System

Feature Highlights

Lists key features and capabilities of the 400-watt speaker system.

Important Information and Support

Customer Support Contact

Provides contact details and hours for Altec Lansing customer support.

Color Coding for Connections

Explains the color-coded system for connecting speaker cables.

System Connections Guide

System Setup Configurations

Describes various connection schemes for different audio modes.

Gaming Setup Instructions

Step-by-step guide for connecting speakers for gaming mode.

Speaker Connections

Stereo and Stereo x2 Setup

Details on setting up stereo and stereo x2 modes for audio playback.

Front and Auxiliary Inputs

Information on connecting audio sources to front and auxiliary inputs.

Headphone Connection

How to connect headphones for private listening.

System Control Functions - Part 1

Power On/Off Button

Instructions for turning the speaker system on and off.

Master Volume Control

Guide to using the rotary knob for volume and other adjustments.

System Control Functions - Part 2

Treble and Bass Adjustment

How to adjust treble and bass levels using the system controller.

Mode Selection

Explains how to cycle through Stereo, Stereo x2, and Gaming modes.

Rear Volume Level Control

Steps to adjust the volume level for rear satellite speakers.

Factory Default Reset

Procedure to reset all system settings to factory defaults.

Speaker Placement Guidelines

Subwoofer Placement Warning

Crucial warning about not placing the subwoofer near monitors or drives.

Satellite Speaker Placement

Recommendations for optimal placement of front and rear satellite speakers.

Enhancing Audio Presentations

Adding Dialogue to Presentations

Method for mixing external audio sources like microphones with system audio.

Auxiliary Input Applications

Connecting External Devices

Suggestions for using the auxiliary input for other audio sources.

Product Specifications

Technical Speaker Specs

Detailed technical specifications for the speaker system components.

Power Requirements

Voltage and frequency requirements for different regions.

Troubleshooting Guide

Troubleshooting Common Issues

Volume Control Advice

Guidance on using system vs. computer volume controls.

Speaker Not Working

Steps to diagnose and fix issues where one or both speakers fail to produce sound.

Addressing Noise or Static

Solutions for crackling, static, or other unwanted audio noise.

Radio Frequency Interference

How to handle potential interference from radio towers.

TV and Stereo Connectivity

Information on connecting the speakers to TVs or stereo systems.

Low Bass Output Troubleshooting

Tips for increasing bass output from the subwoofer.

Subwoofer Hum Issues

Diagnosing and resolving hum noises from the subwoofer.

Monitor Distortion Issues

How to prevent monitor distortion caused by the unshielded subwoofer.

Bent Controller Connector Pins

Advice for straightening bent pins on the controller's DIN connector.

Customer Service and Support

Support Contact Information

Details for contacting Altec Lansing customer service via phone and email.

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Altec Lansing 641 User Manual

Table of Contents

Questions and Answers:

Altec Lansing 641 Specifications

Summary

Safety and Warranty Information

Damage Requiring Service

Servicing Guidelines

FCC Compliance Information

One Year Limited Warranty

Connecting the Power Cord

Introduction to the Speaker System

Feature Highlights

Important Information and Support

Customer Support Contact

Color Coding for Connections

System Connections Guide

System Setup Configurations

Gaming Setup Instructions

Speaker Connections

Stereo and Stereo x2 Setup

Front and Auxiliary Inputs

Headphone Connection

System Control Functions - Part 1

Power On/Off Button

Master Volume Control

System Control Functions - Part 2

Treble and Bass Adjustment

Mode Selection

Rear Volume Level Control

Factory Default Reset

Speaker Placement Guidelines

Subwoofer Placement Warning

Satellite Speaker Placement

Enhancing Audio Presentations

Adding Dialogue to Presentations

Auxiliary Input Applications

Connecting External Devices

Product Specifications

Technical Speaker Specs

Power Requirements

Troubleshooting Guide

Troubleshooting Common Issues

Volume Control Advice

Speaker Not Working

Addressing Noise or Static

Radio Frequency Interference

TV and Stereo Connectivity

Low Bass Output Troubleshooting

Subwoofer Hum Issues

Monitor Distortion Issues

Bent Controller Connector Pins

Customer Service and Support

Support Contact Information

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