Originally Posted by augerpro
If you must stay with a dipole setup (as opposed to wiring it to be bipole) then the only sensible thing to me is to keep the same relative polarity of the dipole woofers with the main speakers because the wavelengths are so long. The high frequencies have such small wavelengths that there really is no way for them to be perfectly in phase with the main speakers. They will go from in phase to out of phase depending on the frequency, room reflections, listening position, etc.
Still, if you have dipoles with the woofers in phase, than these would have to Butterworth filters (probably 3rd order) for them to still maintain a mirror image. But Butterworth filters don't form proper dipole radiation due to their nature of being in phase quadrature (90 degree phase seperation). If they are using Linkwitz-Riley (whether 2nd or 4th order) one side will have a null at the crossover. Neither of these options can be considered technically correct from any POV. I probably missed it but what slopes are they using-and not what the electrical filter is, the actual acoustic slope?
Well, the specs would probably say it best:
Design: 5-driver, 3-way surround / rear
1st-order electro-acoustic at 2.1 kHz, 2nd-order electro-acoustic at 300 Hz (bass drivers)
High-Frequency Driver(s): Two 25-mm (1 in) G-PAL domes,
die-cast heatsink chassis, ferro-fluid cooled, IMS / SHOCK-MOUNT
Bass / Midrange Driver(s): Two 102 mm (4in) S-PAL cones,
ferro-fluid IMS/SHOCK MOUNT, die-cast heatsink chassis
Bass Driver(s): 178-mm (7 in) mineral-filled polypropylene cone, 38-mm (1-1/2 in) voice coil, AVS die-cast heatsink chassis, IMS / SHOCK-MOUNT
The bass woofers (NOT the midrange drivers) are in phase or keep constant phase with the fronts as far as I know. But the mids and tweets are out of phase with each side and possibly each other (in the vertical stack).