Dunno, Mikewarrior2, buy I'm sure that the stock fans are louder than silencers, which seem to be on a par with the L1A panaflos. Don't have any panaflos on hand at the moment for a direct comparison, though.
There's always the issue of one manufacturer's ratings not matching up to another's.....
I've been all over the Antec site trying to find a spec on the fans in question, DF1208SL, without any luck. Where did you find that spec, anyway? Just nice to know. Thanks.