Refurbishing a pair of KLH model six speakers

Likely that you get to the crossovers by removing the woofer and any filling that's inside the speaker. If there is any sort of tweeter level control, it's likely that corrosion in that control is the problem. This was/is a common problem on AR 2a/3a speakers. It's unlikely that the crossover itself is causing the loss of highs.

Once you get to the crossover, you can see if any caps are bulging or find high quality one's on the internet...but unlikely that's your problem.

Usually plenty of part etc. on Ebay..I bought a second pair for $1 and made a pair from two pairs of speakers..They look and sound great..Crossovers were fine in both pairs..I just flipped the tweeters............

Thanks for the info. I took the woofer out and poked around inside. Didn't see any bulging caps cause the crossover is all epoxy overed. I did take the tweeter out and put power to it and it works. There is a cap that is held down by a bracket and one of the leads go to the tweeter. Is this the cause?

If I remember correctly there is a black wire and a red wire ( pig tailed ) going to the tweeter..Red is hot/Black is neutral..You can also check the wire connection coming from the woofers that I think also ( Operating on memory ) are secured by a wire nut fastener..Its possible that the connection needs to be secured..Its not very likeley that both speakers have bad wire connection..If only one speaker was not operating I would think it would be possible but being they both don't work,it could be the crossover..