You have a WHOLE HOLIDAY to play with it - ENJOY
NO TURKEY for SLOTS
Get the AS-EQ1 subwoofer equalizer from SVS. Though discontinued, find one asap. It will time and amplitude align up to 2 subs indepently and simultaneously.
In the absence of the above then I'd suggest you use one of 2 methods. The 'NULL' method or the 'PEAK' method. I also would suggest you first go through the normal speaker calibration process as has been described here generously and many times over by Bob Pariseau and others. Both methods also require you to have an external noise source set to generate signals around your crossover frequency as indicated by previous ARC measurements.
1. After, the above calibration process is done, now reverse the polarity of the LF speaker terminals. You can do this directly at the speaker terminals or at the back/rear of your power amplifier (but NOT both).
2. Go to your sub distance setting in the Setup -> Listener Position -> Subwoofer in the setup menu.
3. Play your noise source and measure the SPL reading on your RS meter as you vary the subwoofer distance settings from 0 to max in 0.5 ft increments as you record the SPL reading from the RS meter.
4. The distance setting that gives you the MINIMUM reading is the optimal sub distance. You're done ....
Remember to reverse the LF speaker terminals (at the speaker itself or the back of the power amp) to their correct polarity!!!.
1. Do NOT reverse LF speaker polarity as described above in NULL method.
Same steps 2-3 as above.
4. The distance setting that gives you the MAXIMUM reading is the optimal sub distance. You're done ....
My preference is for the NULL method for its easier to detect reliable nulls than peaks on the RS meter.
God bless and Happy Thanksgiving!
EDIT: You might have to re-ARC your system after the above mentioned phase alignment.