its true - but its that same subjectivity we use when choosing a guitar and listening to music. I dont need scientific tests to tell me a piece of music sounds good and i dont need scientific tests to tell me if a guitar sounds good - its all about what pleases my imperfect human ears.
Because music is art and therefore subjective, the frequency spectrum of different woods is not one is measurable the other is not.
You saying a guitar 'sounds good' means about as much as me saying the same guitar doesn't 'sound good', they're just opinions, nothing more, nothing less, It has no bearing on comparing the sound of "sapele vs mahogany" or any other woods.
And so will mine, but you and I expect differences whereas bartbrn doesn't, we both hear what we expect/want to hear..
yet other claim to hear the difference between capacitors and pay a premium for PIO, or bumblebee caps... who's right? you or them?
You can see an interesting comparison of caps here:
http://freestompboxes.org/viewtopic.php?f=6&t=12118&hilit=scientific
(sorry, think you may need to join the forum to access it, but it's well worth it, and a great forum to boot)
I would like to see the same frequency comparison software used for bartbrn's experiment, then we would have some actual facts to go off