I plan to build a home theater. Currently I only have a pair of  kg 5.5. And I try to find a surrounding to match this. with the age of these pair, I can not chose what I want but whatever ebay or craigslist have. I find one pair of KSF 10.5 for sale locally. Cosmetically they seem match well with kg5.5. Anybody know how they match audiowise?

Welcome aboard! I think you'll find that you will have much better luck finding what you want if you'll list the state you live in. People here really will help you find what you want.

As far as your question goes, if you want floor standing surrounds I would buy another pair of KG5.5's/KG4.5's/KG3.5's.

If you want bookshelf size surround speakers I would suggest KG2.5's.

I haven't personally compared the KSF's with KG's side by side.

Good luck to you.

Keith

welcome to the  forums!

if you are in search of some 10.5's i have my entire set up for sale.  see sig.  here is my craiglists ad let me know if you have any questions. 

 how come you know I'm in DFW area?:-)

I've already have pair of kg5.5 so I prefer matched 3.5~5.5 if possible. but maybe ksf 10.5 may match. 

i didn't know.  you didn't have a location.