I have 5 in a Jonsbo N2 itx case and the drives are barely audible, really pleased with them. Well worth the cost at $270 or less. Don’t spend more than that, worth waiting for deals if you can. I walked out the door at $220 each last year, been up 24/7 (with a UPS) and no issues. Would recommend.

I have 5 WD red pro 16tb in another itx case (N1) and those fuckers are loud despite using the same backplane + rubber slide mount system and a heavier chassis.