speaker capacitors-----leave alone or does it open pandora's box ?

@erik_squires 
Probably because of loser ESR or inductance or some other characteristic is why. 

That said, there's no reason to believe that more expensive caps "improve" any particular speaker. Plenty of hyper-expensive caps sound bright and analytical with various drivers. The best cap in the world is the one that's got failings that properly compliment the driver in front of it, and that all have measurable failings. 

@erik_squires
Right back at ya. You make lots of statements based on your experience that are pure opinion and they're not very resistant to scrutiny. All I’m saying is look at the actual specs of the things and experiment instead of obsessing about price tags, ad copy claims, and the opinions of folks on a forum. Sorry that ruffles your feathers.

@erik_squires 
I've recapped speakers. It's not brain surgery. Any idiot can do it. It gets expensive when you're needing big values with high voltages. The voltage ratings are important. Solen are my choice. Better than Audyn in my opinion.