I've tried to google this, and all i get are tons of people selling various fans from 5500 - 7500 rpm, all claiming to be exact replacements... which they obviously can't be...

Does anyone know the exact spec of the fans used in the S19?  RPM, CFM, connector type?

Has anyone tried to use a higher quality fan that claims to be quieter?  I can't imagine it would be much more quieter, but 5-10db would be a nice drop if you can maintain the same air pressure