The real question is, what are you hoping to achieve with upgraded caps? What don't you like about the speakers in stock form?
True true... For many years, my first reply to such a query would be: What do you listen to? Tell me about your system, and your room. What do you like about your system now? What would you want more of if you could have it all? Budget? If we got this far, I would need a schematic if I did not have one. And, some pics of the caps that currently resided in the XO.
The problem is that we would only get that far about 25% of the time. The most common reply to specific improvements was, "I'm just looking for general improvement". It often headed downhill from there...
In this situation, Fred told us everything from the beginning. Given his new acquisition, he could not have given an in depth account of the current performance. He did not want to reinvent the wheel via installation or budget. He was willing to pay up if someone could sell him on something with actual experience (reading between the lines). He knew that caps and resistors were a viable source of improvement if chosen correctly. He was looking for advice, because his selection would have been from an uninformed position. And, most importantly, I gave advice because I know these parts, and his speakers.
I thought getting better (more expensive) caps would naturally improve the sound.
More expensive=better....BIG mistake. Caps "can" improve the sound, but they are application specific.
The result was a different sounding speaker, but not better to my ear.
Roll the dice, and you will likely buy an education.
I had owned, and loved, these speakers for a lot of years. After my "upgrade," they lost their magic, so I sold them.
That is truly unfortunate
Fortunately, I have helped many before they moved to sell, and hundreds more before they made that mistake