You don't have to pump this one too loud
927544
Mediocre 90's collection tries to be all things to all people but fails being much to anyone simply because most of the material has worn away or the songwriting wasn't there to begin with. A few exceptions to this rule hardly justify a purchase, I'm sure these tracks can be found elsewhere.
2178685
I own two air pumps and the "Tetra Whisper Air Pump" is substantially quieter than the "Silent-Air X5 Air Pump". I may have a bad one, but the one I have is substantially louder than the Tetra. I actually don't hear the Tetra, but I can definitely hear the Silent-Air.
4016090
Very nice and easy to operate, but not loud enough to really rock out. I bought this to replace a Sony boom box of similar size that did not have an aux port. The sony was a bit louder and still clear. I still think this is a good value.
2772542
<div id="video-block-R1C3DYS8VS30UY" class="a-section a-spacing-small a-spacing-top-mini video-block"></div><input type="hidden" name="" value="https://images-na.ssl-images-amazon.com/images/I/C1VtsH1uhBS.mp4" class="video-url"><input type="hidden" name="" value="https://images-na.ssl-images-amazon.com/images/I/71cKF18zoZS.png" class="video-slate-img-url">&nbsp;This is a versatile pump designed much like a sump pump. The difference is, of course, that this pump is much cheaper and does not have a float-activated on/off switch. So you plug in the pump when you want it to begin PUMPING and unplug it when you're done. To avoid all this plugging and unplugging, I simply plugged the pump into a power strip with a switch. This makes flipping the pump on and off much simpler.

I needed a simple pump for ejecting the water out of my basement when I drain my water heater. This job is simple: the pump is used to lift 50 gallons of water about 6 feet, up off the level of the basement floor and out of a window. I pump my water out of a large, flat tub. You can also stick it in the bottom of a barrel or 5-gallon bucket. I run a hose outside and the water is long gone in very little time.

The hose end attaches to the pump very easily, and at that point it's easy to turn on the pump. Before using this pump, I was lugging buckets of water out of the basement by hand. Now I just pump it out with the flick of a switch on m power strip.

One thing: Be very careful not to run this pump dry, as it needs water to stay cool (and not burn out).
3976310
I had a Whisper air pump, it was so loud I couldn't keep it turned on for long periods of time. This Uniclife pump is pretty quiet, it is pretty silent on the lower setting, but the good news is that the lower setting is very strong, it powers two bubble wands in my 50 gallon tank just fine. I am glad I purchased as I can keep it on all of the time and my fish are healthier because of it.
4611878
It's not silent, but it is quieter than many.  Your threshold level of silence is relative.  Volume pumped is not excessive and close to the dual outlet whisper (1/3 the price and much louder) that it replaces.  Compared to the majority of air pumps made for aquariums since 1960, this air pump is one of the more quiet and certainly most expensive of these vibrator type that I've owned for the volume pumped.  The hum produced here is still noticeable, and can be reduced if placed inside a cabinet.  If your bubbles are louder than the pump, then you might have a "quiet" pump for your purposes.  I have this pump as the air source for many tanks (9 - 2 1/2,  2 - 10,  1- 55), and there are many air outlets, so in my case, the bubbles are louder than the pump.  There is no "extra" air for me to use - 14 outlets.

Rating:  3-4

Pros:
more quiet than many
dual outlet
each outlet separately controlled
has a hole so you can hang from wall
long enough power cable
comes with tubing and adjustable eheim air stones
Youtube review measurement says sound is about 48 db while most others are 70db
small size
3 year warranty

Cons:
very pricey for the volume of air pumped
Certainly not silent

Not sure about how long this pump will last.

This might make a gift for a fish person with just couple of tanks.

For about the same price the Hygger is more quiet and pumps much more air.
2439623
I bought a house that has this pump already installed. It's a little noisy when starting up but goes into a smooth hum once the water is flowing. I live in a really quiet neighborhood and the wind blowing through the trees makes more noise than it. The sound is not completely quiet but not bad at all. Mine only has a screen enclosure for shade. You can always build some kind of sound barrier enclosure if you need total silence, but it will need some ventilation. My realtor had his pump located behind a 6'x6'stone wall directing the sound away from his property. You could not hear his pump at all.

It did start making a squealing noise for several seconds on startup each day this past January and I was worried that the bearings were going bad, but the sound went away on it's own after about 3 weeks. We never got down below freezing but I guess the cold was indeed affecting it. Took off a star for the squealing. I don't think the pump is THAT old.

Although there are some more energy efficient models out there, this one seems to be at a good price point for efficiency, as it's half the price of the top energy saving models, while not being too bad on your electric bill. I looked into a solar powered pump setup and it's just not there yet. Some are so expensive that you will never break even much less save any money at all. So until then, this pump is a decent choice.

On a side note, there is a youtube video showing how easy it is to replace the two bearings that cost about $5 each. My pump is no doubt out of warranty so I might give it a try if the squealing noise comes back, or maybe even sooner if I get bored and start itching for another project.
302453
Easy to carry, relatively quiet.  I had a 3 gallon Craftsmen compressor that was a pain to carry around.  It was also pretty loud.  I wanted something lighter and quieter and this seems to fit the bill.  Works great with a smaller nail guns like a brad or finish nailer but can't keep up with a framing nailer, three or four nails and you have to wait for it to catch up.
4950901
When I first got this air purifier, I was very pleased with it.  It was compact and didn't take up much room. I agree with some of the other reviewers when they remark how loud the product gets after time.  If you are someone who can't sleep with a little noise, this is not for you.  As it ages, it gets louder and that is only on medium speed.  The price was good and even though I have only had it for a year, I guess I got my money's worth.  Don't be cheap.  Spend a little bit more money and get a bigger one that doesn't make so much noise.  That's what I did.  This one is now in our spare room on low. On a good note, it tends to work and do what is was intended to do, just extremely noisy.
2102189
Sufficient volume to be a nuisance, but it won't wake the dead.
4091008
The pump works okay from a functional perspective, but it is noisier than I like.  I ended up replacing it with an Aquaclear powerhead pump, which while more expensive is much quieter and has a similar flow rate for my CO2 system.  I would recommend skipping this low cost pump if you care about having a quiet pump.
2680302
I bought one of these a couple of months ago.  It works well, and mine does not make very much noise.  I can hear the fan, but it's not any worse than the one it replaced.  With a small fan like these have, trying to move a decent amount of air through the power supply, it can't help but make some noise.  I'd rather have a little noise, and have the power supply last longer because it stays cooler.
68659
As everybody else seems to be saying, the water is plenty loud. You can definitely still hear the pump if the room is quiet, which is kind of a bummer.

Overall, it's a nice fountain for the price and although you can hear the pump, it's fairly subdued. Not a deal breaker
1748680
This pump was easy to install. The directions were clear. The operational instructions were also easy to understand. Once you go through the steps you don't need the instructions any more.  You can program this pump to run at any time or speed. With one touch you can override the program speed. The pump sounds different than other pumps. At high speed I can here it more than my old pump. When running on the speed I selected for normal circulation it's quiet. I am pleased with this pump. I'm sure it's going to save money on the power bill.
883711
Its great if you're not taking it to seriously. The sound affects are pretty loud, I'd say comparable to louder than a standard car horn. The megaphone part is pretty lack luster though. I can't really hear anyone's voice much further than yelling. I mounted this to our off road cart to kind of use as a rallying call to let everyone know where we are/its time to group up and it works most of time as long as I use the siren. Install is easy, one wire to power, other to ground and mount the speaker in a weather resistant yet non sound dampening location.
1205256
I was replacing a Badger 5x.  While the installation wasn't as quick or as simple as others suggested, it was still easy enough.  It's also not quite as quiet as others mentioned, but again, I am ok with its volume.  I've had it in a week, and so far, so good.
4773389
This thing is loud enough that you can hear it being on from the next room. I wouldn't want to watch any content that had quiet parts with this thing in the room. On the plus side the XBox didn't die in the last year with moderate use, but the Nyko didn't last a year. It still looks brand new, without even any dust on it, so it's not exactly a harsh environment. As is typical with small dollar purchases and the high price of gas, it makes as much sense to throw it out as to repair/replace with the same annoying device.