Fin1Bxn,
Did you test from one or more than one position? I found that moving even a few feet away from my sitting position dropped or raised the frequencies depending upon room nodes. The devil is in the details and the speaker is capable of going lower than your readings would suggest. I believe it speaks to the placement of the speakers and your measurement position more than the design of the speaker. Of course it is necessary to use the RS meter correction or a computer/RTA software/calibrated microphone setup.
Did you test from one or more than one position? I found that moving even a few feet away from my sitting position dropped or raised the frequencies depending upon room nodes. The devil is in the details and the speaker is capable of going lower than your readings would suggest. I believe it speaks to the placement of the speakers and your measurement position more than the design of the speaker. Of course it is necessary to use the RS meter correction or a computer/RTA software/calibrated microphone setup.