Guitar maker Dan Bouillez modified an inexpensive dreadnought guitar by replacing the fixed soundboard with a floating one, improving the instrument’s clarity, volume and tone. The fixed soundboard is held in place by the guitar’s strings, allowing it to vibrate more freely. Bouillez is currently adapting his prototype for production.
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It’s not a guitar, it’s a Bouillez.
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I’m seeking info for sanctuary reverberation absorbsion material ( panels) and best placement.
There may be apps that do that. You can definitely find spectrum analyzers that will measure ultra low.
Is there an APP that can measure the ultra low frequency levels?