That depends on background niose in the room and other noise-making components in your case. However, in pretty much any case 14dBa would be inaudible.
The question isn't how accurate their readings are, it's the distance they're taken from. Companies like Panaflo, etc, take their readings from very close to the case - typically within a couple of feet, giving you a good, real-world rating.
Other companies, however, I have seen measure at 10 feet, etc, giving them the significantly lower SPL ratings.
yea i have 4 of those, way too noisy. I am currently running my rig w/ side panel off and all 80mm's unplugged. W/ just the zalman psu fan ans vid card fan it's near silent. Need an alternative.