Hi Lampshade,
I play both those instruments (guitar and violin). Yes, as the wood dries out over the years, the resonating "box" (surfaces) of acoustic guitars and violins become more resonant and rich-sounding. More scientific studies (including one published years ago in Scientific American magazine) show, however, that the changes in tonality of instruments are not as great as some claim.
The same is not true of loudspeaker enclosures. You do NOT want the speaker enclosure to resonate like a musical instrument, because then the enclosure contributes its own set of vibrations to the sound, which make it less accurate and colored.
That's why the vast majority of well-engineered loudspeakers are made of MDF (medium-density fiberboard) because MDF is one of the most non-resonant materials available. Additional internal bracing also helps dampen potential resonances and, in Axiom's case, we use the tapered enclosure to further cancel out potential internal box resonances.
After all, a loudspeaker is NOT a musical instrument. It is a transducer, converting analog electrical signals into acoustic replicas of instrumental and vocal sounds. As such, it should be as neutral as possible, contributing no "sounds" of its own (from enclosure vibration) to the reproduced music.
Regards,
Alan
