So, what's the latest? Any pics of them in place? Any REW testing? Listening impressions?
Thanks for asking, Augerhandle.
I meant to update this thread but never got around to it. Don't have REW or other similar device but I intend to get around to that too. I did, however, level match all four subs though (the two tubes up front and two (marty) cubes in the near-field), prior to running Anthem ARC. As for listening impressions, I am finally in a place where I don't feel the need to "upgrade" in this particular area. I know, I know, this is AVS and the DIY section to boot so I expect the upgrade bug will soon hit me and I will be busy building something new. In the meantime though, I am super impressed with both the quality and quantity of bass that I now have. The tubes, by themselves, are more than enough to overwhelm a large room but I do like what the (supporting) cubes do in balancing out the room. I'll put it this way: I am really glad I built those two monster tubes and since they hide behind my AT screen, it's icing on the cake.
As they say, if you don't post pictures it didn't happen---so here you go. Not the best pictures and I have since painted the legs and base black so everything blends. You will note from the graphs, I did not use a LPF but Anthem made the appropriate cutoffs anyway. Altogether, it sounds marvelous.