"false; twice the diameter does not make twice the surface"
True, there are 2 speakers ie 4 drivers.
132 sq inches vs 113.1 for sub.
I agree with johnk that GENERALLY 80hz is the defacto "do no harm" setting to set and forget. However, chess is absoluely right that a lower setting can be better depending on many variables.
One thing also of benefit to crossing over at lower frequencies is taking advantage of lower mass in those drivers at capable frequencies. Lower group delay. Lower distortion etc.
Both scenarios are viable. Depending on too many variables to decide without hearing in the room.
Tell us more about the tannoys chess.
