To revive an old thread for the sake of anyone else considering this, the q7 is designed like it is for various purposes.
The two drivers act as a kind of dipole, it gives better dispersion control/off-axis response control. This works by there being a half wavelength cancellation at 90deg off axis. This is only effective over one octave around the fundamental cancellation, above that the huge tweeter wave guide keeps the off axis response consistent. Another cleaver thing is the handles sort of act as phase guides to reduce coloration I suppose.
The whole point of having a good control of dispersion as well as having a similar response off axis to on axis is to reduce the amount of sound being put into room reverb, and having the sound that is be as similar to what the listener hears line of sight as not to muddy up the sound.
Hope I have explained my self alright, hope this helps