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Being the premise of next InDIYana being the 'Inner Sanctum', and surveying the projects I have to place on the burner that would suit that premise, I have done some preliminary modeling to meet that pending goal.
There aren't many modelers that can accomplish the multichamber and multitunings of a DCR/DBR/ABC(WinISD) alignment and do it justice. To top it off, this pending project with a 4" long throw Kartesian SUB120 has to take really long and large ports or PRs to tune low enough. Furthermore, it has to take 2x DSA135PRs to keep all the elements somewhat happy. The Double Chamber Reflex alignment type entertained here is likely to keep the elements a little happier still by making the tuning range broader and reduce excursion further. It just has to be done with PRs for the low tunings required. I have not done a DCR with PRs, so this is another one on the bucket list I've wanted to go for.
Using the measured T/S for the Sub120;
The online program that Jurgen Micka created and placed online is pretty powerful, and a versatile tool for such a thing. I think it is Akabak based. You can access it here:
I wish I could download it and not have to be used on the 'net, but oh well...
I figured out the only way the parts would fit in the initial PR box would be to side mount the DSA135PR and front mount the SUB120. Since that is the case, I could not use 1 or 2 more DSA135 and make them fit in any reasonable fashion or placement as normal DCR alignments go. I figured out I could use an 8" PR for the secondary unit and likely place it on the back by using a U shaped secondary chamber.
Modeling with Micka's program shown in the next post...