I have four SP 2500 speakers. I got them with a Sansui QR6500 4-channel Receiver and a Teac 2340 4-channel open reel deck while I was in Vietnam in 1972. The receiver gave out a while ago, but I still use the speakers in the living room. I added a center channel speaker and use them for listening to music.
The speakers still sound fairly good; I do not try to push them too hard.
They worked very well with the Sansui receiver; the midranges are angled so their sound fields cross and seem to give a wider soundstage. They sounded very good in the 1970's playing vinyl records, they still do pretty well with CDs.
I would recommend keeping them, but don't try changing out drivers and crossovers (new caps for the crossovers is a good idea.
I hope you enjoy them.