^^^^ In the mean-time, you can try the following methods:
1. Basically, first use Arc's Quick Measure(QM) to move the sub around the listening room to get the widest and smoothest frequency response.
2. Use the sub crawl technique, where you place the sub in your listening position and crawl around the room until you hear the deepest response. I would modify this technique a bit by using QM and placing the ARC microphone about a foot off the floor but facing up and moving it around the room until you get the widest and deepest response graph.
3. If you have 2 subs, either above method works(I prefer #2). Make sure both subs have their phase knobs set to 0 degrees before you start this test and that each sub is levelled at 73dB via its volume/gain control for a combined 75 - 76dB level.
It would be nice if you can get both subs optimal but in most cases, one sub will be optimal and the second sub not so much. But thats ok, for you can now play both subs at the same time and adjust the phase knob button of the second sub until you get the widest and deepest frequency response for both subs using QM. Leave the first sub phase knob at zero and print the combined response.
Then set the phase knob of the 2nd sub to zero and adjust the phase knob of the first sub until, again, you get the best combined frequency on the high and low end. Print the combined response and compare the two printed frequency responses and determine which subwoofer setup to use. Then perform ARC and post the graphs here for feedback.
Tweaky final stage is to phase match the subs to the mains BUT this is to extract the final 5% - 10% of the performance as described in my sig below. First concentrate on the 90% - 95% part.