1. OP Update: SASS construction/design question

["erikguldager" erikguldager]

So a fisrst update after recording and comparing the SASS with a dual boundary 
setup.

The stereo localization of the SASS sounds very realistic. I can easily 
pinpoint the physical positions in the sound field. Sounds from the rear have a 
sound quite similar to how I experience them myself. I think a dual SASS will 
be very nice for realistic 4-channel surround ambiance recordings.

But the dual boundary has a significantly superior Left Right separation, 
almost unnaturally so, but that is not at all bad in my line of work (FILM and 
TV). But it doesn't have any front rear localization at all (for natural 
reasons) and that does not really work a lot of the time.

So what about a boundary shaped like this? # (although straight of course)
Really just an extended square

Has anyone tried anything like that?