thanks for the detailed reply, What are you using on top, a 2370? - I already own 2-cast frame Eminence from MCM a few years ago - just sitting in their boxes - I think they are essentially 2.5" voice-coil Delta Pro - (also Dayton 295-070 - they don't go high - their curvlinear cones are doped and dust cap kinda large...dunno why they were executed that way)

I'll sure have to check into the Kappa 15LFA - one consideration with solid state amps would be to use 2-15LFA/side (or whatever) stacked tight vertically so a horn can be used on top (D'Apollito may be Ok?) - what do you think of 2-15/side with horn on top? - cost wouldn't be much more - should have some serious "punch". Also - pretty much sure woofers with dissimilar fs can work well in one box --tends to flatten the Z curve (ala' VMPS)

btw - what size box and tuning do you suggest for Kappa 15LFA?

Best wishes!
Freddy