Why do you want to replace the capacitors? Are your power amp and speaker malfunctioning?
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My experience suggests changing out loudspeaker caps first is biggest bang for buck. Don't listen to the naysayers, changing out caps can result in great improvements.
As far as cost, the best is going to cost dearly, lots of choices at lower price points. You need to determine which caps are presently used, what sonic improvements you're looking for and budget.
If you have some DIY( Do-it-yourself) experience and are handy with a soldering gun, replacing a couple of caps should be an easy afternoon of fun for you. get access to the cross-over network. Determine the capacitance and voltage of the caps in there for the woofer and tweeters( if 2-way design) There is another site called Madisound that specializes in speaker cross-over parts you can order from for cap replacement. Their website is:
Be careful and have fun.
I recently rebuilt the crossovers on my Kestrels - pretty simple circuit - my first DIY venture - but as Sns points out it isn't a cheap date by the time you redo caps, inductors, resistors, internal wiring, binding posts - I have nearly as much in the rebuild as I paid for the (used) speaks - moral being look carefully before you leap
no question that the sound is improved - 100%? - probably not but I was lucky enough and had smart enough advisors that it enhanced what was already there - it didn't change the character of the speakers - in other words there was no startling now you hear it, now you don't kind of moment.
I suspect the main reason for this was the attention paid to everything that went in the crossover. To Sns point, it takes really good parts to improve on a good design.
I got my moneys worth and more out of doing it. Sourcing everything, creating a workbench, consulting on the parts, learning how to do it - that was all tremendously satisfying.
The fact that they work, much less sound better is just a bonus LOL