I'm following this thread with interest.
Not wanting to hijack your multi-sub experiment, rather join it - for now, possible I'll make my own thread if I choose to further explore this.
For my IB line array set-up, I've got some nulls in my 1st row that after all my broadbass traps in corners/etc still are there.
Specific seat to seat.
2nd row if very-very good.
Is this the "method" in 101 terms:
-Use a parametric EQ (I have a FBQ2496) as a LPF for only the specific trouble freq
(mine are centered around 30 and 35hz, actually I'd block the frequencies above 35 hz and below 30 hz)
-put a "spare" sub in the seat (for this experiment I'd borrow my 14 year old 12" Atlantic technology Model 352 PBM from the family room set-up)
-using REW/other do a sine wave at the trouble freq
-walk the walls to find where I can hear the sub "best" (with spl to quantify)
-repeat for both trouble seat locations
-hopefully find a single location that will satisy both seats and nulls, or pick best compromise again via sine sweep/testing
-then put the sub @ that spot and measure @ the seats...
it's as "simple" as that??
I'm looking to filling in the nulls w/o gaining un-wanted peaks onto the IB sub's response, kinda have my cake and eat it too...
your charts, are those 1/12 or 1/3 smoothed?