True Sensitivity of TSi500 Speakers?

gotexas872
gotexas872 Posts: 13
edited January 2014 in Speakers
The Polk product page shows that the sensitivity of the speakers at 91dB. While in this review, http://floor-standing-speakers.toptenreviews.com/polk-audio-tsi500-review.html the author has the sensitivity rated at 96dB. Why would they be different?
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