Wayne Parham Messages: 18786 Registered: January 2001
Illuminati (33rd Degree)
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You'll want the spacing between horn and midwoofer to be as close as possible to provide a tall forward lobe. Watch the "Vertical Nulls" video in the "Crossover optimization for DI-matched two-way speakers" link I posted above, earlier in this thread.
I would suggest placing these speakers on stands and adding flanking subs. Maybe start with just the main speakers now, and add flanking subs later. And I'd use a passive crossover on the mains, and drive them with your tube amp. Flanking subs can be driven with plate amps.