Just hooked up my La Scalas from a cabinet rebuild that I have been doing and when I hooked them up one speaker sounds really muffled compared to the other. When I first got the speakers I dont remember this one sounding this way but could of just had the jitters when first playing with them and didnt notice. My question being, would the best option for now to recap them? Running a pioneer spec 1 and 2 along with sg9500 equalizer. All the equipment has been rebuilt recently so I dont think it has to do with that. Running sound from my laptop, ipod, cd player, and iphone. All of which that one speaker is sounding muffled. Is recapping the solution?

It sounds like a failed tweeter. Disconnect the tweeters from the crossovers and measure DC resistance with an ohmmeter. They should both measure the same within a few tenths of an ohm. This is not a definitive test as there are failure modes that do not change the resistance. Try swapping tweeters. Try swapping networks.

Try driving the muffled speaker from the amp output currently driving the non-muffled speaker, etc. Swap components/channels from the known-good channel into the muffled channel *one at a time* until you hear a change.

If the problem moves with the networks, re-capping *might* be in order. My AA networks are ~32 years old and the capacitor values (capacitance and ESR) measure OK. I'm not a fan of replacing film or paper capacitors just because of age. If a cap measures poorly enough to indicate replacement, it might be prudent to replace the other caps in the same network or stereo pair of networks.

Ttry sticking a rag in the squawker horn, then place your ear right in front of the tweeter.  If you can't hear anything, the diagnosis is complete.