Noisy WD Red 4TB :-/

[pl_svn]

Hi all

just replaced x2 3TB WD Red with two 4TB and... these are noisy indeed!
did it in an HS-251 I'm using as part of an hi-fi chain (so it *has* to be quiet!): with 3TB Reds I only could hear the disk spinning up when waking the NAS, now the spinning noise is constant (same settings as with 3TB: NAS set to sleep at night only, no HD spin down during the day)

do I have bad HDs or are Red 4TBs indeed more noisy than 3TB ones? :-/