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Introduction

The Altec Lansing ACS90 Speaker system was a popular choice for high-end computer audio in the mid 1990’s. While it might be out of date by today’s standards, it’s still a worthwhile find for decent sound at a bargain-bin price.

This teardown is not a repair guide. To repair your Altec Lansing Computer Speaker System Model ACS90, use our service manual.

  1. Behold the beige wonder of the ACS90 speakers Because both speakers have nearly identical internals, this guide will focus on the right "source" speaker.
    • Behold the beige wonder of the ACS90 speakers

    • Because both speakers have nearly identical internals, this guide will focus on the right "source" speaker.

  2. Use a medium sized Phillips-head screwdriver that is at least 6" or longer in length to the unscrew 6 screws holding the speaker together
    • Use a medium sized Phillips-head screwdriver that is at least 6" or longer in length to the unscrew 6 screws holding the speaker together

    • Pull the case apart, careful not to damage the PCB or Speaker inside

  3. Whoops! Pulled to hard and broke the PCB! But the 4W Speaker inside the case came out just fine!
    • Whoops! Pulled to hard and broke the PCB!

    • But the 4W Speaker inside the case came out just fine!

  4. Putting the PCB back together, we see inner workings of our speaker Critical to the speaker are a high-current, adjustable voltage regulator
    • Putting the PCB back together, we see inner workings of our speaker

    • Critical to the speaker are a high-current, adjustable voltage regulator

    • And a dual op-amp IC

    • And... that's it! The speaker's come apart and this tear down is complete!

Joe Sandoval

Member since: 11/19/2019

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