rewire older speaker internal wiring?

thank you all for your thoughts. I would like to explore the caps being replaced, but I have not been able to access the crossover from the inside the speaker box with the drivers removed. The Crossovers are apparently mounted on the front of the speaker behind the controls to adjust the highs and mids gain. It does not appear to be an easily accessed area. Any thoughts? I do not want to destroy the speaker's box. I do understand that the old caps are due for a change as they are most likely drying out or dried out from age. Any ideas would be appreciated. I know they are old an some will not see the point to doing this. I really like the sound of these speakers, but feel they are not what they used to be. All drivers are in perfect conditon, and the boxes are not bad either. Thank you

Different brands of caps will have totally different sonics.If
you get in there to do it,maybe try Solen first.They're kinda
neutral.There might be stuff on the net telling you what to
expect from what brands in that speaker.Sometimes a cap change
can make it sound like a different company made it.Same thing
goes for amps.I hope this link helps out. Link>>>[http://manuals.harman.com/JBL/HOM/Technical%20Sheet/4311B%20ts.pdf]

Any good wire should be ok.Good tight connections are important.Also,don't use higher uf,or mfd values on the caps
unless a real pro tells you its ok.That will pass lower frequency's to the drivers possibly blowing them.A little higher voltages should be ok.There's a lot of JBL fans on the net that may have places for help.

Another link>>>[http://www.lansingheritage.org/html/jbl/jbl.htm]

Many people experienced in this rebuild will tell you to use a parallel 'bypass' cap of some small value.
Don't forget that caps in Paralled ADD values.

Solon is a good choice as is Clarity SA for more $$. It gets wacky after that and in my OPINION should not be purchased unheard or without a knowing recommendation.

My panels start wit Solon and I am pricing out a new x-over of identical design to original, using Clarity SA. I could spend more $$ on a single Mundorf Gold/Silver/Oil (whatever) than I intend for the entire project!