Does replacing cross overs in 25 year old speakers make a difference? Assuming they used open air cores and polypropylene caps. I understand those caps don't change in value over time. I've read of tests that show statically random listening results, yet there are web pages that list capacitor performance like describing fine wines. I understand the argument of manufactures using cheaper components to balance cost. Is any of it measurable? Really how old are my speakers in "dog years"? And how about those cheap molex spade connectors (as compared to the gold plated posts on the outside of the box) that tend to connect all the internals?