dwilawyer:
Clarence,
The rule of thumb is that you want your ear the same height as the tweeter. That rule of thumb is for a typical speaker and is just a rule of thumb. I would get a few different height chairs and try different heights before if I were you. You should even go as low as sitting on a couple of phone books. You will be surprised. At lot of rules of thumb go right out the window with these speakers. What is much more important is how far apart they are and how far back you are. How far apart are your corners?
Travis
While I agree with Travis that the ear height the same as the tweeter might allegedly be the "rule of thumb," my ears tell me that the Klipschorn benefits from its height and the fact that the squawker and midrange is slightly higher than ear level. In fact, I used to run my Belles at regular height, which put the tweeters and the squawkers at ear level, and I ended up raising them up on cinder blocks to get them higher even before I moved them to the rear. So.......unless you hear some perceived deficiencies, I would not worry about tilting the Khorns down (unless you really want to build some sort of custom tophat).
BTW, Joe - listening to more of the jazz albums I bought off of you tonight with the "modded" system. Oh.......so good...........
Carl.
Mains: Khorn bass bins, Altec A7s (Altec 902s, Trachorns, JBL E140s), center: 91 Belle; side surrounds: KG 3.5s; rear surrounds: 77 Belles (Radian 850s, ALK ES, Forte drivers), SVS PB12, Peach, Classe SSP30,MkII, NosValves VRDs, Sonic Impact Super-T, Dynaco ST 70, QSC PLX 1202, Crown Powerline 4, Yamaha P2200, Yamaha PC2002M, Jolida JD100 modded, Denon 2900, NAD 4155, Thorens TD160 Super w/Grado Reference, 7.1 in all. Oh, and some Phase Linear Andromedas and other stuff.
Family Rm: RB25s, RC7 (Dean mod), JBLs, Yamaha RXV1300, SVS 20-39PCi.
Patio: JBL 4612s.