I don't have the scratch for expensive instruments, but if we're talking about tone we have to remove all biases, this means let's not get into what is subjectively pleasing or whatnot or dismiss things we can't afford. Hiyaw is a thing that exists, and while we have NO canonical definition for it as it is, here's some observations I've picked up over time from sources OTHER THAN FM55. Sana wala nang personalan, guys. We're talking about objective qualities inherent in the guitars themselves. Nothing to do about your favorite musicians, or the guitars you use.
Harmonic content
- Some pieces of wood have a character that others do not. ALL pieces of wood, even from the same tree, resonate differently and sound different from each other. Some blanks accentuate certain frequencies. Others accentuate all the "right" ones. I'm sure Paengkee (if he still posts here) has something to say about this given his audio background. It's not really a linear scale, but the mix of frequencies could range from horrible to absolutely pleasing.
- There is truth to be found in FM55's idea of universally pleasing tone, and psychoacoustics can back that up. To which extent, I'll be looking into.
Dimensionality
- I'm sure many of you have heard the term "airiness", even for solid bodied guitars. While I feel this may be somewhat related to the accentuation of the "right" frequencies (which I'll get back into once I review that psychoacoustic crap), only a select number of these "good" sounding guitars have THAT dimensionality. This is another wood-related thing.
Price and production scale
- While there are MANY instances of "cheaper" or "more accessible" guitars being more pleasing than expensive guitars, one has to understand that with bigger production numbers, you're a bigger slave to the luck of the draw unless you pay the premium for someone to actually source good sounding wood (real top-tier luthiers can tell the difference a lot of the time). Because of the scale of production and the time/quality/attention involved, prices shoot up. Don't be surprised if more expensive guitars are better on average.