I checked one[1] of the review and the sound itself isn't bad compared with other home appliance. So while it's loader than their claim (could be because chosen mining speed or distance), IMO it's still within comfortable range.
[1]
https://www.youtube.com/watch?v=TVSUNZxSBis53db is just too much for a heater!
I watched the video, and the guy at 4:00 says that he's surprised the sounds come only from the air being moved just as a normal fan and he can't hear any mechanical noise. WTF!!! What kind of mechanical noise would you expect from a miner other than the fans? Pickaxes chipping away bitrocks?
Also, the heat test is just nuts!
He compares a 1.4 kw machine with a 2KW heater and surprise surprise, the results reflect the power draw.
You want a heater that mines some coins and does not cost $800?
Just go with this solution:
https://bitcointalk.org/index.php?topic=5436532.0They mine at the same hashrate, they radiate the same heat (d'oh), and you're left with $1000 you can buy some coins now!
Here, too, it is necessary to take into account how the testing was carried out, there is, for example, a video where the noise is measured Compare HeatBit and Bitmain Antminer S9 using an android application, I think that in any case the noise level there is much less than that of an Asic miner, starting from 5.24min
It's an S9 in a box, put an ASIC miner in a sound proof box and you're going to get the same result!