So my most recent build seems fine without a sound hole. After I put it together I gave it a play, and I just don't hear a need for the addition of a hole in the body. The body is 1/4" ply, which seems to resonate just fine and produce plenty of sound. Has anyone else opted out of cutting a sound hole? Cutting a sound hole has been a standard practice for me up to this point.
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I like the tone and volume that it produces now. I will leave it as-is. Thanks for your thoughts. Very good ideas.
Loosen it off a little and try strumming it with a shim of wood holding it open just a tad.. Listen to it closed and slightly open, it's best to make a judgement with more information without having to change anything.
Like the Thiele/Small calculations for a speaker/amp cabinet size for closed/ported/open-back, lots of fiddley little bits having a big impact on the response.
Depending on the size/material/thickness of the box and the attachment of the neck & bridge, & the frequencies imparted, the air inside the closed box can act like the bumper/cushion on a pool table and strongly rebound the compressions inside the box back to the soundboard to reinforce its transmission to the room, or with a sound hole allow the vibrations from the inside face of the soundboard to reflect outside and join the vibrations from the outside face of the soundboard to reinforce
or dampen and cancel if the physics line up the wrong way....