Instructables

Step 13: Install the grommet for the bass tube as well as the foam

In this step you will be attaching the grommet that acts as the bass tube, as well as the sound dampening foam, which will help the box not sound like a metal box.
 
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Decie_Boy3 years ago
what is the purpose of the bass tube. is it just a hole in the box?
aliebnick3 years ago
What exactly is the bass tube? I don't see any actual pictures of it. Am I missing the obvious?