Daveyf,
I used to own a KSA50. It was NOT "all that", as my daughters like to say. Shrill on the high end, etched, but ballsy bass for something of it's power rating. When I bought it used(~1992) everybody else was drooling over the KSA250, and to a lesser degree the KSA150. Years later, I still recall many Krell nuts searching for & bidding up prices of 4-5 yr old KSA250's to almost the level of their brand new, newer models, FPBxxx. Rumor had it that many were being purchased by Japanese Krell fans, who were willing to spend crazy sums at the time. If you get a chance to hear a KSA250 or KSA150, I'd check it out in lieu of the 50. The KSA80 was a comparable model, I belive, but with slightly more power. Cheers,
Spencer