First take out the drivers and see if it has any specs on it. You want to know the sensitivity. Give me a price range to work with as well. I find it very unlikely KLH will have replacement parts for these speakers if they are old. Cause the KLH twenty years ago is almost a completely different company today. A great site for replacements is partsexpress.com which is the site I will look for drivers for you. If you have the phone number for KLH, i guess it wouldn't hurt to call and ask them.

-Joey