Nearly as soon as I posted, I realized a 2pi didn't make a lot of sense for where I was going.

I'm in what gets referred to around here as the"tube-friendly" camp, although I think a lot of us are actually in the SET-friendly camp, which is even more demanding and less forgiving than some of the PP tube amps. So power handling is not a consideration, but keeping the amp happy is. The less compensating I have to do in the xover, the better I like it, so flatter uncompensated response looks like a good thing.

I'm going to use Martinelli horns w/PSD2002's. I'm thinking that I should be able to cross them over somewhat lower than the smaller flare on the face of the spkr cab allows. Does this make sense?

Keep your ears and your mind open.