I'll answer the simplest one first... GET the SVS EQ1 especially if you have dual subs. It handles sub bass way better than ARC does.
Now the "lack" of bass response you alluded to earlier, IMO is due to the low room gain you choose. Probably ARC must have suggested something higher and you reduced it to make your graphs look 'prettier' but not sound better than the ARC solution. Did you try the default solution that ARC gave you at 5K with the default room gain? Please post original and new targets.
The deep null at 70Hz is IMO probably due to a room mode. Since you said (and correct me if i'm wrong) that moving the sub is not an option, the you have 2 other options that will involve money. Invest in the SVS EQ-1 as i said before and, if you can swing it, get a 2nd sub(same type/tonality/manufacturer) as the first one and place it in the back of the room for example. The fix would involve running the SVS to time or phase align the subs which would help eliminate that null and provide even bass response around the room.
I finally got an AS-EQ1, it is coming tomorrow. I have a question. AS-EQ1 only allows RCA connections. I use XLR's to connect to my amp, and when I will be connecting the LF RCA out from D2v to AS- EQ1 during it's level calibration. Can I go back to using XLR's after that or I will have to switch using RCA's between D2v and my P5 amp..
I plan to run ARC after AS-EQ1. Just going through the manual, might have some more question. Generally, should I just follow the AS-EQ1 procedure in the manual, or any tweaks you want to suggest. Thanks.
Edited by paradigm25 - 1/22/13 at 6:20pm