Build A Pair of Stereo Speakers

Step 12 Preparing The Insides: Part 2: Sound Insulation

The woofer creates sound waves inside the box too, which in turn can reflect off the walls and bounce back out the front. This degrades the sound quality of your speakers. To prevent sound wave reflections and resonance build up inside the box we need to install sound absorbing material.

One common method is to place a bunch of fiberglass into the box and seal it up. Fiber glass is pretty rough and messy stuff so i decided to line the sides of my box with carpet instead.

Cut out rectangles and squares of carpet using a knife. The most important place to put the carpet is on the back wall of the box. I put a bunch here and a few strips on the other walls but remember: this material takes up volume too so don't use too much. Use epoxy or a staple gun or both to fasten the carpet to the walls. Make sure they are securely fastened to prevent rattling.

A very last optional thing to do:
Line the edge of the back panel with a bit of rubber. I glued some bicycle inner tube down to help keep the box airtight. If your pack panel fits perfectly you probably wont have to do this but make sure the enclosure is airtight.

WE ARE FINISHED! don't screw the back on yet, its time to test it out!