Qts and Mms dictate low end sensitivity?

Lightninghoof
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I was browsing the forums and came across some info that I thought was interesting. I always thought that Fs dictated a subwoofer's low end sensitivity, however I read a post (I believe by a TC engineer) that stated low end sensitivity is not dependent on Fs, but rather Qts and Mms. (higher numbers) In another thread, a several members stated that the Phoenix Gold Titanium Elite 12" was the lowest playing subwoofer they had ever heard. I looked up the specs of the PG TiElite and found that it has a high Qts, a very high Mms, and a very low sensitivity. (.56, 371g, 82dB repectively)

ftp://anonymous:anonymous@208.187.3...nualrev8.02.pdf

This correlates to what was said about having a high Qts and Mms. It has a very low sensitivity, which correlates to Hoffman's Iron Law. (sacrifice efficiency if you want low end and small box size)

Does this sound accurate to you guys?

If I was in the market for a 15" "low end monster" like the PG Ti Elite for sealed box use, based on these findings can you guys make some recommendations?

 
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