Ok gang, here's something to think about:
Had the test results gone the other way, and people had easily identified tonal differences in the woods, would you still be as critical of the tests?
You bet I'd be critical, science is science. It's like being pregnant, you can no easier be somewhat scientific than you can be somewhat pregnant.
Dan, to be clear several years ago I was strongly in the camp of wood makes no significant difference in tone when kept in perspective of all the other things going on with a bass build not to mention playing style and amplification and the rest of the mix. Take a look at one of my earlier posts on this thread.
I spent TONS of money putting together the perfect bass for my tastes and even went so far as to live with it and play it on a daily basis in practice and in a every kind of mix you can think of for months and months. When I was completely positive my test mule had the perfect pickup, preamp, string, bridge combo I took it all apart and put the those EXACT parts in a fresh new body with a fresh new neck. The results were ASTOUNDING - night and day. The test mule had a basswood body and maple neck with rosewood fb the new bass had a mahogany body and Indian rose wood neck and fb. I was shocked when I first plugged in the new build bass and expected to hear one thing but instead heard something completely different, and in many regards even better. I ended up modifying my final build to compensate for the changes the wood imparted on the tone. The 3 biggest changes I made to compensate for the unplanned effect of the wood was to refret the neck with brass frets, replace the tusq nut with a brass nut and replace the DR Black Beauty strings with Optima Golds. This brought the top end back without sacrificing anything on the bottom end.
To validate that something else wasn't at play I even went out of my way to build a 3rd bass with an ultra light swampash body and maple/maple neck, then yanked everything off my mahogany/rosewood bass (#2) and installed it on the new new bass (#3) with close to predictable results - much brighter, more zing on the top end and a degree of "clank" to the notes. Needless to say everything went back into bass #2 and that's my main bass to this day.
So there you have it - 3 basses built, for all intense purposes all were completely identical except the wood (bass #1 did have a different truss rod and maybe stiffining rod arangement than the others). One basswood/maple/rosewood, one mahogany/rosewood/rosewood, and one swampash/maple/maple. All three sounded very different from each other in spite of the fact that I didn't want them to. It cost me a lot of time and money to compensate for the impact to my plans and my tone that the wood made. I would have been much happier and richer had I not noticed a difference. Live and learn. And yes this information is aneqdotal not scientific but I suspect it's largely repeatable. The only thing I didn't attempt was to play a recording of each bass thru my cheap computer speakers. I did play recordings thru my home stereo equipment and directly thru three top notch reference quality bass rigs (which I also purchased specifically for this bass build to ensure I had not only the perfect bass in practice but in gig and studio).
I wanted the perfect bass for me - regardless of cost and got it, along with a lot of unexpected learnings.



