set speakers large or small?

ok if i set the sub at 80 what should i set my recv. at

Sounds below 80 Hz can be localized. The issue to address is not localization, but rather, a smooth, linear transition between mains and sub. It might be possible at 80 Hz, but highly doubt it could be done any lower with the Thiel 1.6. Velodyne's recommendation may be based on the fact that subs generally have a rising response in the mid-bass, by having a little 'gap' in the crossover it could help smooth out the hump, or the logic could be to help tame common room modes that often occur in the same frequency range. No matter how one looks at it, calibrating a sub is difficult. It requires time and patience.

Ojgalli

"Sounds below 80 Hz can be localized" is a sweeping statement of purported fact. Can you provide a reference, a refereed JASA article, for example? It's been decades since I worked in psychoacoustics, and my memory may be faulty, but IIRC we're not vary capable at localizing LF sounds.

db