The Guild GAD 30 is solid spruce top, solid mahogany back and sides.

The Guild GAD 30R is solid spruce top, solid rosewood back and sides.

I wonder if anyone has ever done a direct comparison between the two Guild models and could relate any tonal difference between them?

Many thanks.
Last edited by return2guitar at Oct 6, 2009,
I haven't done a direct comparison, but I can bet you that the overall sound of the rosewood will be bassier. Mahogany will be lighter and a bit more articulate.
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Rosewood: deeper bass, brighter treble, slightly scooped mids, usually very rich in harmonics and overtones

Mahogany: more mid-centric, a bit "snappier", bass and treble probably won't match rosewood, less overtones and harmonics

Rosewood is the more resonant wood, but that doesn't mean it's better. Different strokes for different folks.
Mahogany is best if you are in a band, for unaccompanied guitar go with the rosewood.