DIY Bass Trap

So I’ve been busy lately.  Built a new recording/practice studio this summer/fall and I’m finally getting a few finishing touches done. One of those “touches” is acoustic treatment.

One of the more important aspects of studio acoustics is making sure you have a reasonable reverberation time. At the bass end of things, most untreated rooms are filled with the acoustic equivalent of mud. Trying to mix in such an environment is difficult at best. So, the front line treatment is something called a “bass trap”. You can find decent bass traps from a variety of companies such as GIK. The job of the bass trap is to absorb low frequency energy thereby reducing the sonic mud for a more clear and detailed response. Many bass traps are little more than a frame filled with a rigid fiberglass or rock wool material (denser than typical house insulation) and covered with a fire-rated acoustical cloth (such as loudspeaker grill cloth).

As part of the construction, I wound up with a box of 12 two-by-four foot sheets of two inch thick Owens-Corning 703 rigid fiberglass left over. So I purchased eight yards of Guilford of Maine fabric from GIK and sew-on Velcro from Industrial Webbing, made a pattern that is essentially a two-by-four foot box with a lid, six inches high. The Velcro covers the three edges. I dropped in three sheets of the 703, closed the lid, and bingo, four nice bass traps. The photo below shows one of the units open, ready to receive the 703. Note that there is an extra 3″ of fabric beyond the Velcro to help keep any stray fibers contained.

Opened bass trap

Bass traps are most effective in the corners of the room. These units are stiff enough that they stand up by themselves so I simply propped them in each corner. Here is one sitting behind my drum kit:

Bass trap in corner

These were relatively inexpensive to make, especially considering that the 703 was surplus from the construction. I can barely sew on a button, so a faithful family member did the sewing duties for which I am extremely grateful.

FYI, a thread about the studio was started on the VDrums forum this past summer. You can find it here.

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