It really is not bad as far as sound to heat ratio is what I call it.  My room is pretty cold ambiant it's turning winter.  But you can hear it running in the video.  It can rev up but with my cold ambiant it tends not to do that to often... and my surround sound/proector exhust kinda dull it out.   But the ambiant you can see in front of miner and behind exhaust on front page.

I need to do it again and document it as my amabiant is even colder (I have a window open my dog enjoy's it).  The best DB reading is from phil in thread with his reader.  I used a smartphone app which was not bad, but phil had a true DB reader.