Sorry guys, this is a bit presumptuous. I do agree the OP should try to silence the enclosure, but...
I have a nice Synology DS411j, and with (4) nice 3TB WD drives I can hear the disks i/o. I don't have anywhere else to put it myself.
Should I buy 12TB of SSD? I don't have a closet I can stick it in. Luckily the noise really is negligible for me, but for others it may not be.
The point is, with MC18 comping out, how about we see how a solution to this potential issue might interest others after loading more files into entirely into memory.