According to the wavelength calculator, that is one wavelength at 250 hz.

I read somewhere that speakers need to be crossed over BEFORE they are 1/2 wavelength apart.

That would mean I need to cross at 125 HZ ?

I can do that, but my ribbons will not go down there.

NOW I think I see why VMPS staggers the roll off of their woofers ?

I really did not want to go back to the stagger tuned woofers because I do not like the idea of part of my midrange being reproduced by a 10 inch woofer stuck high in the air.

I am sensitive to Image shifts, and when I have the levels of the main ribbons set low enough to blend with the woofers, I can sometimes here the Image "jump" up to that top woofer.

Dunleavy used widely spaced woofers in the SC 4, anyone know how he got away with it ?