i spend a lot of weekends at a local shop that makes its own high end speakers. After the basic speaker is made, there is a lot of time spent tweaking the speaker, including making adjustments based on the specific wants of a prospective buyer. There have been many times i heard quite dramatic changes made to the sound based on the prospective buyer's preference, and not all such changes are to my liking. But, the point is that such small changes DO change the sound. Such changes include changes in internal wiring, as well as crossover parts and even binding posts. This builder often puts truly crappy looking binding posts on his amps and speakers because they sound good to him. Some customers insist on something fancy, like WBT silver binding posts, and he will do it, but then have to compensate elsewhere as best he can to get back to the sound he wants.
Any such tweak, to the extent that it actually changes the sound, has the capability to improve or hurt the sound. It comes down to a trial, and one should be willing to accept that the trial may not work out well and one has to reverse the operation to get back to the starting point. One would then have to decide if another experiment is in order.