I seen Erin's measurements and that particular contour plot doesn't seem to correspond well with the horizontal frequency repsonse which is unusual. It also doesn't correspond with his comments. I'm not sure what is going on there as I am sure that whole process is automated wirth the Klippel (Wish I had one of those for work). I will report back when I measure them, raining today but mine will look more like the horizontal frequency response graph. We have a measurement system that does it with 15 degree increments, its preset so easy to do. Takes a little time to set it up though. I am guessing about 60 degrees by the design and the waveguide's shape. One can usually get a rough idea by the design unless they really messed up a crossover or something. For instance, if I see a tweeter without a wave guide they are typically only good to about 40-45 degrees before you see the off axis start detiorating. In general, woofers aren't usually that bad for dispersion unless they crossover too high and get to frequencies where they start to beam.
I have a small one row HT room with a 7.2.4 system in it and I have a 2nd larger home theater room but that might be getting repurposed soon. So, that one is not up and running at the moment. I do listening in both my theater and family room typically. I feel my family room is good spot that represents a lot of average homes for their living/ family rooms. In this business I see less and less dedicated rooms being done in homes, current company excluded. I do a lot of testing in my family room when we get new speakers or equipment at work, projectors I do in the theater room. Sometimes it is sound bars other times speakers or other equipment. I have the LP-6 there at the moment but I do miss the sub. I want to try their IN series as I think that will be a nice step up according to reviews, but they and their sub are back ordered. Hopefully, they arrive towards the end of the month but I will traveling for a bit at the end of the month and in April, so it might be a bit before I get to them.