This thesis investigates the suitability of plantation-grown Fijian mahogany (Swietenia macrophylla) as a substitute for native-grown mahogany for the manufacture of electric guitars. I hypothesize that differences in anatomical, physical, chemical, acoustic, and musical properties between the two wood types would influence their performance as tonewoods. Five experimental chapters compare plantation-grown and native-grown S. macrophylla using microscopy, physical testing, chromatography-mass spectrometry, synchrotron X-ray fluorescence, stress wave analysis, and musical evaluation. Anatomical and physical analyses revealed differences in vessel size, ray width, and heartwood colour of the two wood types, but no significant differences in density or mechanical properties critical for guitar manufacturing. Chemical profiling (GC or LC QToF-MS) combined with machine learning successfully distinguished plantation-grown wood from native wood, providing a robust tool for material verification and sustainable sourcing. Acoustic testing demonstrated similar dynamic modulus and damping characteristics, and guitars constructed from each wood type exhibited only subtle tonal differences. Listening tests confirmed that tonal quality was preserved, although some preference for native-grown mahogany was associated with its darker colour and ease of machining. I conclude that plantation-grown Fijian S. macrophylla is a musically and structurally suitable alternative to native-grown mahogany for electric guitar manufacture. Broader acceptance of plantation-grown mahogany will depend on addressing aesthetic and machining differences through established manufacturing techniques, as well as ongoing engagement with sustainability-focused consumers and luthiers. Recommendations for future research include evaluation of plantation mahogany from other regions, development of traceability tools, and exploration of chemical and thermal treatments to further optimize tonal performance.
Joseph Doh Wook Kim (Thu,) studied this question.