Double KLH 9's was THE speaker system to own in the early 70's. They (along with the original Quad) were J. Gordon Holt's reference speaker, and were Bill Johnson's speaker of choice, until he heard the original Magneplanar Tympani T-I. An SP-1C, D-75, and D-51---now that's about as classic as they come! The only rival would be a Marantz 7c and pair of Model 9's.
Kisawyer, I see that David Janszen is rebuilding/upgrading the KLH nines. Are yours the original, unmodded version? I have the Janszen zA2.1's but am fascinated with the KLH nines. How big is your room? How far from are they from the wall?