Okay ampheads - a potential stumper. I have a pair of each of the aformentioned speakers that I don't have stats for and have spent my time surfing. The Celestions I know are S15-250 Sidewinders. Also a Celestion G-15 I need spec ons. I've never found a site for old 15" Celestion stuff. I'll have to pop the lid on ShpeakenShtien (my 6x15 cab lab) for the ID's on the Klipsch and L'Acoustics. Those of you who have access to such info will know whether you have a shot at it or not and I've got stuff pile all over that cab and really don't want to dink with moving it unless necessary. So let me know if there's a chance. I do know the Klispch where made for them by Eminence cause they have a 67 speaker code. So that would likely affect tracking. I want to say K43s. They're supposed to be musical instrument speakers and I'm guessing the few such speakers Klispch puts out, they appeal to Eminence for. I've only seen one other set of Klispch musical speakers and they were in cabs with horns on ebay. The L'Acoustics reportedly came out of a DSOT (DOST, jesus! whatever) system and I believe it cause they's some serious puppies. And the Klipsch reportedly out of their verson (Lascalla - whatever) of the DSOT (whatever) system.