Loud screeching sound!
593131
I bought this for my husband for Xmas. We had one in the past and absoluately loved it. This one however is a different story. It is loud, top doesn't go on all the way (making steam come out), and the kerrnals don't pop! I am very disappointed with this product.
4127399
No matter how loud or soft I put the volume of the speakers, it makes a constant "thudding" noise every couple minutes. The noise is very loud and it sound harmful for the speakers so I try not to use this as much.
The speakers sound great though - aside from the thud sounds. (I may edit this post to describe the thud in more detail)

EDIT: The noises are more of a popping sound (very high pitch and annoying)
4782743
It does what it is supposed to do, but it is SO LOUD!  We had to turn up the radio to drown out the noise it makes.
3403687
it works fine but makes a loud roaring noise. very noticeable while inside the vehicle with the windows up.
4589977
Okay,, so I've had this thing for 3 months now and today was the only time I've had an issue with it (probably my fault). I was charging it and playing music off of my phone at the same time, went to unplug it and it started to make a horrible screeching noise. At full volume none the less. Tried holding the power button to turn it off... no response, tried turning the volume down...no response. Looked around for the what you would think would be an obligatory hard reset button, found none. So, in not wanting to kill my ears any longer (or the device) I unscrewed the back cover (opposite the speakers) and clipped the battery wire in order to make it stop. Needless to say, I'll be installing a kill switch just in case it happens in the future. Other than that I love it. Whats not to love...charges and plays at the same time, has a flashlight (pretty bright too!), aux in (3.5mm jack/.), TF port, good sound and carries quite well outside.
876
It works exactly as advertised but OMG it is so loud! And the blue status light is very bright. The combination makes it almost impossible for me to sleep while this is on, which was the whole reason I bought it--my bedroom is at the "end of the line" and doesn't get enough AC to cool the room sufficiently. Considering taking off the back as some other commenters have suggested to reduce the noise.
3974082
It is very loud.  If you need a loud alarm this is the alarm for you.
312100
WARNING: Every time you turn it on or change a function a super loud, super creepy, super stupid man's voice announces what you are doing. It's obviously supposed to be funny but it is ANNOYING!

Sound quality is good and it's a rugged speaker but the built-in voice is enough to make you go CRAZY! Would have been a 5 star review otherwise.
1777814
This is the loudest, most obnoxious sounding tea kettle I have ever owned. It makes loud noises even as the water is heating. Look out and hold your ears when it starts boiling. You'll think there is an air raid. It also has a small rust spot on the inside after owning it less than a month.
4756310
This is a noisiest fan I have ever had! The high pitch whine is unbearable!
Do not waste extra money on this fan. Cheaper 80mm fans work much quieter!
3202093
It is adorable, classic and kids love it. Unfourtuantely it means when they are using it you hear this very loud clacking, like they are banging wood on wood. As they get older and run faster it is unbearable! We were constantly hiding it. It was in the closet more than it was out.
537466
it sounds so loud. it broke mid spinning AND launched at my eye. but... i guess  it was just 5 dollars
3395580
Never could get it to stop squealing!!  Trying to get our neighbors cats out of our yard since they come in to mark territory.  Not happy with this device, so put it back in the box and should have sent it back.  I could always hear it no matter what setting we had it on!!
2562490
It makes a very irritating screeching sound when it's in the oscillation mode. It's very distracting and very intrusive. I thought I was getting a well-made fan that I would not have to worry about but here I am returning a second fan in two days. Ugh!!!

Doesn't anybody make a good dependable fan anymore?

And it's going to be a real challenge to pack up everything the way it was stuffed into it's packaging and box.
4364385
This cooler is LOUD!  It sounds like a tractor.  I spend all that money to get something that is quiet.  It is so loud and distracting that I think I must be operating a harvester.  Corsair should be ashamed.
1074615
The humming  and clicking is driving me mad!  Unusable even in family room with blaring tv and screaming kids.  My wife would smother me with a pillow if I put it in bedroom.  This has to go back.
134460
Louder than I thought it would be. Makes a whinning noise that is really annoying when I'm not wearing my computer headset. That is the worse part about it. The whine is louder than the fan