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90 to safely and effectively help you sleep. The Avantek sound machine is our pick for the best overall sound machine because it has a diverse selection of white noise and nature sounds. It performed above average in our sound masking test, and we couldn’t hear any noticeable looping during our audio quality tests. It doesn’t run on batteries, but the compact and durable design makes it a worthy travel companion. The Avantek Sound Machine has a great selection of high quality white noise and nature sounds. It’s twice as expensive as some of the budget-friendly sound machines we tested, but it’s built to last. 20 and has a good selection of sound profiles, including white noise. The compact design and optional battery operation also make it a good travel companion. The LectroFan only has white noise and fan sounds, but it was one of the best performers in our sound masking test.

It is easy to operate and has a sleep timer. The Avantek Sound Machine has 20 white noise and nature sounds, as well as the most adjustable range of volumes we tested. The buttons and case are durable and compact, making it an appropriate choice if you want to travel with a sound machine. Its noise masking capabilities aren’t quite on par with the most efficient sound masking machines we tested, but the Avantek is more cost effective. This sleep machine has six white noise options, six fan sounds and eight nature tones to choose from. There isn’t an LCD screen to see which sound and variation you are listening to, but it has a memory function that saves the last volume and tone setting you used. It also has a sleep timer for one, two, four or seven hours, which is a longer timer than on the other sound machines we tested. One hour should be sufficiently brief, but we prefer sound machines with shorter timers as well. We tested the audio quality of each sound machine by intently listening for obvious loops in the sound profiles, and taking note of how realistic the nature sounds are.

The Avantek sleep machine was one of the best performers in this test. The nature sounds don’t have any startling noises, and we couldn’t hear any obvious loops. It has 30 volume settings, so you should have no problem finding the perfect sound, and the perfect volume, to help you fall asleep. 20 and has most of the important sound profiles. The compact design and optional battery operation also make it a good travel companion. We have some concerns about the durability of this sleep machine compared to others we tested, but in this case the trade-off creates value. We tested the sound masking abilities of sound machines by playing the white noise setting while a reviewer in the adjacent room made normal household noises. The white noise setting on the SoundSpa sounds like a soft television static, which isn't distracting, but our reviewers weren’t impressed with its ability to mask external noises.

• How much does the machine cost
• Memory function
• Did you just drink a cup of coffee or soda
• What are some alternative ways of thinking about this situation

The other audio performance test we conducted was a sound quality test. We played all the available sounds to see how accurate they were and surveyed a panel of reviewers to assess if they could hear where the audio loop restarts. The SoundSpa’s soothing nature sounds were better than average, and the audio loops were more than 20 seconds long. More than half of our survey panel couldn’t hear any discernible audio looping. We weren’t impressed with its ability to mask external noises though. This sound machine only has white noise and fan sounds, but there are a wide variety of tones within those two categories. The LectroFan was one of the best performers in our sound masking test, which is the primary use for the white noise setting on a sound machine. The compact and simple design is easy to operate and makes a good travel companion for those who have a hard time sleeping with traffic and other external noise. The loudest noises in our sound masking test were from a blender and a vacuum. The LectroFan blocked those noises better than any other sound machine we tested.

It masked the high-pitched blender noise well enough that none of our reviewers could hear the initial shock of the blender starting. Instead, they reported hearing it as a gradual increase as the blender ran after a few minutes. There are 10 different fan sounds and 10 different white noise sounds, so you should have no problem finding one that satisfies your particular preference. The downside of this sound machine is the lack of convenience features. It doesn’t have an LCD screen to show which sound profile you are using. It is also missing a headphone output, which can be an important feature for someone with a bedmate who doesn’t enjoy the sound of white noise. The one important feature it does have is a sleep timer. The timer is a useful feature for those who have trouble falling asleep but prefer silence once they do. The HoMedics Deep Sleep has the most accurate and soothing sound profiles and its white noise tone produced the best results in our sound masking test.

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