Midrange Increasingly Harsh

There’s your answer , I recently finished upgrading a pair of older Klipsch

the capacitors get dryed out  and start loosing their harmonics it just gets worse 

I replace the resistor so with much better quality then the old cement typeresistors which are gritty , and the stock capacitors in most speakers under $15k is nothing special.  I learned upgrades when I owned a Audio store 

go to Humble homemade hifi capacitor test, you should pul a bass driver out and take a picture, if you are lucky the wires from the Xover are just slide on terminals 

where you can remove the Xover ,if not it’s soldered-in place . If you like them and plan on keeping them that’s what I would do first ,upgraded Xovers sound much better then stock parts ,it’s Like going from a stock engine to a Hot rod. 

Thanks for all of the information, as well as confirmation that I'm in the right place.  I got this tube set from Upscale Audio, so I'll check with them regarding tube behavior.  Room acoustics is an interesting idea, but I've been here for four years and this is a recent phenomenon.  I plan on replacing speakers next year, and would like to get a new amp as well, but my CD player is at the end of its life and needs to get replaced first.  I'll report back when any repairs or replacements are performed. 

+1 @knotscott took the words right out of my mouth! 

With tubes it all depends on how many hours you have on them ,if used often it may be well overdo for tubes to be replaced , and if you have these new modern tube even more so ,I buy only NOS tubes night and day better quality on many levels ,and the small input tubes you can even voice your tone .

speakers that old the capacitors on Anything are drying out gor sure 

I have been modding o for over 20 years and capacitor technologies has greatly advanced. I still see people using electrolytic capacitors in speakers ,why for its cheap and sound like crap very gritty , I just rebuilt a so called crites upgrade 

A electrolytic on the bass $4  i I use poly caps ,or Foil  capacitor depending on budget ,if you have to go cheap and use a electrolytic cap at least put in a 2uf poly or mylar cap on a 100 uf bass cap to filter the highs ,electrolytics belong in power supplies,even they filter with a poly cap if done right , most mfg under $10 k use cheap Xover parts Solen good enough and cheaper ceramic resistors . I refuse to go to their standards ,it’s a petpeave with me , you get what you pay for .

@jrcotner 

Good luck, JR.  Some good advice here ... definitely let us know what you find!!