Hammer Time: How a New Tool Is Changing How Luthiers Understand Tonewood

One of the most powerful tools for this kind of work is the FFT (Fast Fourier Transform) analyzer, which lets you track and study anything that vibrates or makes sound. When testing tonewoods or working on guitars, FFT analysis is indispensable. Over the years, I tried a variety of FFT systems, but eventually adopted SpectraPlus by Pioneer Hill Software. It elevated my analysis to a whole new level. Even mobile FFT apps, though a bit quirky at times, have their place. I’ve had one on my phone for over 15 years. They’re a great entry point for players and curious minds alike.

In 2024, a major breakthrough occurred: the launch of the Acousonix Sonic Hammer, which I helped develop. This handheld device detects and displays the primary resonant frequencies of almost anything you tap. For tonewoods, it reveals key modal frequencies that help gauge a piece of wood’s acoustic potential. For guitars, it’s both insightful and fun: You can tap the top to measure its resonance, hold it near the soundhole to detect air resonance, or tap the back to read the back plate’s voice. Together, these readings paint a clearer picture of the instrument’s tonal fingerprint.