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Are the RS correction factors in the excel spreadsheet the most current ones?
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Yes, they match the downloadable .cal files (as long as you chose the one for your meter).
If you have a sub that you know will not reach down to 10Hz (given its specifications) then I would recommend not measuring that low. The problem is that noise can be interpreted as signal at those very, very low frequencies and with the compensation at 10hz which can be ~30dB with the old RS meter, it results in false readings. I would limit my bottom end measures to 16Hz.
Other than that, it looks like a legitimate graph of your response. You have a couple dips at 30Hz and 45Hz. You will have to attempt a few other positions to see if you can alleviate the problem - then decide if it makes sense to move the sub...
brucek