[larsss]

Any recommendation for a 15 inch midbass unit up to 1000hz. (about 120-1000hz)

Any directional problem with a 15inch unit at 1000hz.

Acoustic Elegance 15 inch dipole come tomy mind.

[JohnR]

I was running (Lambda) Dipole15s up to 800, that was where I got the best off-axis curves on my baffle. Measured curves are here:

http://www.hifizine.com/2011/03/refining-a-4-way-open-baffle-speaker-minidsp-2x4/