KLH BTF220 Bookshelf Speakers

I'm not sure if this is the proper sub to post this so sorry in advance if it is not.

I have a pair of KLH BTF220 bookshelf speakers that I've had for quite some time (maybe 10 years). I don't see or hear anything about KLH, so my question is what is everyone's opinion of KLH? If you're familiar with these speakers specifically then that would be great. Thanks for any and all feedback!