Took an average of the 4x T/S for the quad of 8NMFW and did a model.
Re 5.3608
Fs 42.3280
Spl 87.2345
Qe 0.3796
Qm 8.85795
Qt 0.3639
Le 1.1259
Vas 18.3616
Bl 13.7778
Mms 50.7498
Sd 214.08 as my normal measurement is calculated. The spec seems a bit high to me.
Using 2 woofers in a 42ltr gross box for size requirements, and then reducing by bracing, driver magnets, ports, and pending xovers; 38 ltrs tuned with a 3"D x 8 25" L port tuned to 37Hz yields an F3/10 of 37/25 Hz. With output to 105dB not breaching xmax and port mach remaining below chuffing threshold, this was a surprise in the required volume and port size.
I did model a PR box as well, but it would not extend as low. However, I found that the SS10PR would likely be a good PR for non-subwoofer alignments because it can tune higher than the RSS265PR is capable.
I’ll post the graphics later from the laptop, but wanted to post my findings.