It may still be possible to repair your speakers, using the original components. I met some of the German engineers from Kirksaeter at the CES this last year. This company built amplifiers and preamps as well, and imported into the United States as early as 1971. You could search and see if they are listed here in the USA, if not, shipments from Germany are certainly not out of the question. If you prefer a fresh start, rather than a return to what you had, the other suggestions posted here look very solid to me.
Speaker Rebuilding
I have an old pair of Kirksaeter monitors that sound more like a kazoo than a speaker. When my son was one year old, he used to like to play with the volume control and the music was turned on one too many times with the volume turned all the way up. I like the cabinets and after reading some of the posts, it got me interested in trying to rebuild them. My question is, are there any highly recommended books or sources for supplies to get me started? I know that some of you seem to be very knowledgable in this area. Any advice would be appreciated.