Unfortunately the efficiency of the 2 drivers I found were quite low (81 - 83 dB/w/m) and power limit would barely reach 90 dB.
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Yes - i have the aero 2's (bookshelves) - had them about 1month and a half - your right they are not really sensitive at all - my guess is around 85db
but lets not get caught up in the sensitivity - these speakers are incredible for $499 - they image better than anything with a conventional tweeter that i have heard - they to me are an amazing breakthrough in whats possible at this price range.
the amount of insight and clarity are amazing - they totally blow away forever those cheap pioneer speakers - that everyone is raving about (albeit at 4 times the price)
they fill a big room with sound - they are not sweet spot dependent - dont get me started talking about how good this speaker is - i can go on and on and on and on