I can't resolve how your sub has continuous rising output level down to 7Hz. The specification on the HSU VTF-MK3 using the max extension mode is 18Hz +/-2 dB. I'd like to see an REW response plot. Are you using a Radio Shack meter with the C-mode switch position? (and using the correct excel plot?
Yes, C weighting - Slow Response at the 80
I entered in the readings after subtracting from 80 starting from the first sounds.
