OK, here's your graph. Your link is bad, but I deciphered it.... :raped:
There are some issues here.
The horizontal axis must be from 15Hz to 200Hz since we are only interested in subwoofer response. It will then increase the resolution of the area of interest.
You are taking measurements at too high a level. Try and average around 80dBSPL as shown in the target..
Did you compensate for the inaccuracy of the RS SPL meter with the correct calibration files
here loaded into REW?
I doubt the spikes are realistic. There's a problem with the measurements there I suspect.
Post your graphs if possible using the link I provided in my previous post so everyone can see them.
brucek