Sorry for starting the new thread but I want more people to take a look at this. The more opinions I get the better (especially if they agree). Right now I'm thinking either a Shiva in Adire's vented SBB4 or EBS allignment. I like the lower frequency extension of the EBS allignment and the lower group delays, but when I plug it into LspCAD (with AVA250 power) it gives an excursion curve that from about 22hz to 40hz has the driver past its 31.6mm excurions limit (the range is a little smaller if I drop the power from 180W to 125W). In the 25-30hz range it's almost 2cm past the excursion limit of the Shiva. The SBB4 only goes past 31.6mm for a couple hz around 30 and only by 1 or 2 mm. Will this be a real problem with the EBS allignment and the Shiva at moderate to some what loud levels when watching movies. So for the hell of it I decided to see what happened if I dropped a Tempest into the EBS box designed for the Shiva with one 4" port tuned to 17.5hz. LspCAD then didn't show any excursion problems, showed lower group delays than either of the Shiva allignments, had port airspeed that stayed under 20m/s until below 20hz and stayed over 100db until about 18hz. Is there something I'm missing with this idea, seems too good to be true? I'm at the point where I'm dangerous, I know enough to be ready to really screw things up Any info or input is appreciated. And as always, opinions or first hand knowledge about how any of these three possibilities would perform when compared to a Paradigm PW2200 are what I want the most.