Atlas 15" room response

Ive got my atlas 15 in a 6.5 cu ft box tuned to 20hz via two 4" ports, and was curious what kind of frequency response i was getting, so i downloaded room EQ wizard and made some plots!

Here is the uncorrected results taken with a rat shack spl meter.
[IMGHTTPDEAD]http://img309.imageshack.us/img309/574/subrespthea5nv.jpg[/IMGHTTPDEAD]

Would you guys reccomend i get a bfd? from what i can see my response is pretty good, in fact once you add in the correction values, it should be even BETTER.

After this plot it made me realise i was missing out on a fair amount of low end, must be the subsonic filter on the amp. Is anyone knowledgeable in lowering this down to say, 16hz? i still get enough output at 10hz to visibly flex my windows, so i would definately benefit from changing out the subsonic filter, after all, its free low end
:D

just for people wondering my LxWxH of my room is 12x10x8
 
After looking at those correction values i have a MUCH better room response than i thought. Im not too concerned about that 19hz null because infasound linearity isnt too important. I think ill just keep it where it is and go eqless.

However i would still like to be able to lower that subsonic filter so its [email protected]

my predictions of room gain from the win isd graph were surprisingly accurate if not a little conservative.i guees i really am getting 6db/oct gain under 70hz