![]() ![]() If you're amplifying your guitar, you'll probably never notice a difference (aside from which notes tend to make your guitar feed back the worst, which might shift up or down by a few semitones). The vibrating area is sometimes negatively affected by adding a large cutaway to the instrument (depending on the design). However, on an acoustic, the head brace is on the neck side of the soundhole and the vibrating area of the soundboard is much larger. Most of the soundboard vibrations occur on the bridge side of that brace, so the upper bout (the "neck" side of the soundboard) doesn't contribute much to the tone of the instrument. On a classical, the heaviest brace is on the bridge side of the soundhole. The same thing happens with larger or smaller guitar bodies, and cutaway vs non-cutaway bodies.) (Note #2: "Air Columns and Tone Holes" by Bart Hopkin gives a good discussion of this specific subject.) Now put some liquid in the bottle, changing the volume of air inside the bottle, and blow across the opening again. ![]() (Functional analogy: blow across the open mouth of a pop bottle like a flute so it makes a tone. The volume of the cutaway isn't huge compared to the entire body, but it's a small factor and might affect which chords sound boomy vs which chords sound choked on your guitar. The size of this internal volume affects the pitches at which the air inside the instrument will be most resonant. A cutaway changes the internal volume of the instrument (aka the amount of air inside the instrument). ![]()
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