Boa2 I agree with you on the positioning of the speakers. And also allowing them to breakin. Too many times I've seen people waste a boat load of money trying to make a speaker do something that it's not capable of. I would think the main goal of a cable.Is to get as much of the signal to the component as possible with minimal loss.
It should'nt be thought as the quick fix.
I've rebuilt the crossovers in one pair of speakers I've owned. It made a huge difference for the better . At the same time I think back to what else I could have used the money for ..like another pair of speakers. Or maybe towards another component.
As far as the cable tone controls go. I see nothing wrong with testing the waters. But some ask for way too much of a speaker cable or a interconnect. For example ..I constantly see posting for cables to make the system warmer or fuller or more bass or better highs. No doubt they make a difference but there's a limit to what any cable will do for a system. Some times the problems upstream all along. The cable may just reveal a weakness upstream. Instead of fixing that problem people use cables to smooth it over or cover it up,the same with tubes.
And then other times it's just the speakers themselves. It may not be a good match with the rest of the system. So do you replace the whole system or replace the speakers? YMMV this is just my opinion.