Quietest of the current netbooks ?

[estreeter]

I know the netbook is a dying breed - replaced by the more expensive ultrabook - but as a source I still think they have a lot going for them. My old Asus was quite, but the Acer it replaced was a noisy little brute. Anyone have any experience with any of the current range of Asus/Sony etc 'premium' netbooks ? Feedback on the smaller ultrabooks also welcome, but I fear that they are just too expensive to use as a dedicated music server (JPLAY Hibernate). 
 
Thanks,
 
estreeter