Those black label delta's whine like a bitch in heat...seriously though, they have the pitch of a blowdrier. Not as loud, but that same annoying pitch.
Dodge the FOP38 unless you are mostly deaf.
The FOP32 is pretty good, I favour the Alpha PAL6035..not sure why it's not much better than the FOP32 (or FOP38 if you equip the alpha with a Black Label Delta) but I've always been an Alpha HSF kinda guy.