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DIY Acoustic Treatment: Gobo, part 2 March 18, 2009

Posted by ConnorSmith in : Acoustics, Project Studio, Studio Setup , trackback

The start of the gobo: the inner frame

The inner frame is made of the 1×8 board.  If you look at the original Sketchup drawing, you will see that the inner frame is essentially divided into 2 sections – a 4′ tall and 2′ tall section. Each of these sections is backed with plywood.  Now unfortunately its not as simple as just making the box and dropping the plywood in, especially since I am using store-bought sections of plywood.  Although they are sold as 2×4′ and 2×2′ pieces, they aren’t quite that dimension.  Measure each board, and design your frame around the plywood. The long sides are approximately 74.25″ long (48″ plywood+24″ plywood+3 board widths). The top, bottom, and center support are ~24″ long.

You can see in this picture that I have the plywood on the ground and am building the frame around it.  Note: The plywood is NOT attached to the 1×8 frame at this point. It is merely a reference to make sure I am making the frame correctly.  I used some wood glue and a few wood screws to make the corner, leaving the clamp on until its at least partially dry.

Here is a close up of the corner

When I put the other sides on, I did have the 2×2′ piece of plywood and center brace in there.  I took them out at this point to sand an edge down.

Finally, I put the plywood back in (for measuremeant purposes only!) and add the center support.

The plywood is still NOT attached to the frame.  I am waiting until the frame dries and is strong.  I found that it is much easier to get the plywood flush with a strong, dry frame.

Once dry, I used wood screws and glue to attach the plywood to the frame (flush with the back edge).  Then I caulked the inside edge.  Using true “Acoustic Caulk” is best for this – this type of caulk never becomes rigid (it stays rather squishy forever), but if you are on a tight budget, using a very elastic caulk (such as Alex Plus) should be OK.

Next – fill the frame with drywall.


The Studio Files


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