from what little I've been able to find they are definitely running at higher dB's then stated, but so far they are running at respectable dB levels for good CFM's.
That being said the 11dB rating is for running at 1000RPM's and the fan tends to run a lot closer to 2000RPM's, and I've been reading that the 120MM version is rating around 20-25dB rating.
krhspeedy: got no place to park one that big, let alone 2 of those.
O.