I purchased my Klipsch Kg4s in 1986. I power them with an NAD 3020A integrated amplifier. I still think the combination sounds tremendous. You can still find them on ebay and other sites and for the most part they run pretty close to what they cost new. You can still get parts for them and even upgrades. The NAD is pretty much a classic. They sold a lot of them and they can still be found too. Both are around 35 years old and I wouldn’t be surprise if they (especially the speakers) outlast me.