This one is about 100k-tap FIR filters, my experiments suggest that DTS HP:X uses 32-tap IIR filters. But my impression is that Dolby Atmos works similarly.
The other thing I've noticed about your work is that you don't use filters derived from lab-measured human HRTFs, but instead approximate them from first principles. Very interesting approach, although I do worry about missing out on the up/down asymmetry of the auricles -- not an issue for planar 5.1 though.
