I own the newer RS analog SPL meter and am getting excellent measurements with my Sealed Avalanche 15 sub. I wonder if they're too good to be true? Im dying to get a calibrated mic asap though... Here are some measurements.
Nearfield.
Listening position
What are some ways I can test for accuracy? The spl meter seems to have found the Tuning frequency of my Natalie P's to be 28hz (in-room) instead of my goal to tune them to 32hz...pretty close. My Velodyne DPS 10 looked like this before EQ
and after
Seems like the thing is working...but I cant believe the Avalanche is that flat in-room with no sort of EQ behind it.