There are many top speaker companies who currently use Mundorf oil caps in their crossovers. You can get a lot more feedback on this subject on the Tweaks forum at Audio Asylum web site. The Sonicaps are a good quality cap. They might or might not be the right cap for your Klipsch speakers, but since you have them in there, I'd give them some continous play to make sure whether you like them or not in that location. Until the Sonicaps have been played continously for a few days, they will have a somewhat tight and restricted sound. After break-in, they'll begin to open up in the midrange while the frequency extremes will extend and smooth out as well. Here's a thread on AA for your info:
http://db.audioasylum.com/cgi/m.mpl?forum=hug&n=6874&highlight=crossover+caps+for+Klipsch&r=&session=
http://db.audioasylum.com/cgi/m.mpl?forum=hug&n=6874&highlight=crossover+caps+for+Klipsch&r=&session=