To all,
I probably should have mentioned a bit more regarding the physical arrangement of things. I custom built a 25' x 36' room for this arrangement. High vaulted ceilings with a large 2nd story balcony for 2 (very capable) 15" subwoofers in their individual boxes. The subs have their own independent amplifier ... naturally. I will be acquiring some Khorns down the not so distant road to complete matters. Ultimately, the La Scala's will become the backup speakers positioned at the rear of the room, and the Horns will be positioned under the high placement of the subs. Hope that all makes sense.
I live in SW Utah in a small town near St. George, not far from Zion Nat'l Park. I'm only about an hour drive to Las Vegas. There are no such local places (suggested by Maynard) that would be kind enough to bring over some tube amps to critique and select from. I only wish!
Once the Khorns materialize, will I need two separate amp configurations to drive both sets of speakers? One amp for each pair of speakers? Things are still a bit fuzzy. I think I'm gathering I'll need separate tube amps for the two different speaker models ... or not? Is there such an approach as 1 amp for all 4 speakers?
Thanks for the kind input and participation from everyone. I now realize I should have been more specific about the situation.