Q =.7 not going to sell well at Best Buy ( or alot of other places also...most setups I redo have the expensive subs set way to high in output and crossover frequency also - the ear is very sensitive to phase in the lower mid....
some good low to no cost SW out there for predictive room nodes, yours included...an inexpensive RTA is a good long term investment - I like AudioTools and the calibrated mic. BIG traps can help, as can the resonator referred to above, DIY very possible, especially when driven by data - ya got to know it is 70 HZ....Traps, treatments, etc are great especially if War Dept. supports the habit...and decor changes...
Like Eric said, room nodes can be violent....get some tools..Download Vandertones for free, get analog SPL meter ( Radio Shack ) and measure and listen...
the at home trial sounds good