The wider and higher the wall, the better. You can also liken this to a wall of sound a noisy intruder has to jump over to become noticeable. Now consider the bars in the chart that are well above 50 decibels: for the Dohm this is a very narrow range from 400-630Hz while for the Lectrofan the range goes from 100 Hz to 5000 Hz. The max sound level for the Dohm is about 63 decibels while it is close to 80 decibels for the Lectrofan (set to white noise #4). The Dohm mainly masks moderate mid-frequency noises. Its well-designed white noises cover a much larger frequency range than the Dohm’s fan sound, and it can be set both much louder and quieter. The Lectrofan is excellent at blocking these outside noises, much better than the Marpac Dohm. Think creaking floors, coughing, barking dogs, traffic noise, people talking in neighboring rooms, etc. White noise machines are a very effective antidote against startling sounds that might wake you up. This is not an issue with either machine. After a while, the sound becomes repetitive and if the looping is poorly done, there might even be startling gaps. Note: especially shorter looped recordings annoy some people because the brain learns to make out when the recording restarts. Here are samples of white noises number 1, 3, and 4, which I quite like: īecause the sounds are created on the fly, there are also no loops (as you would have with prerecorded sounds.) The Dohm is for you if you like the sound of a real fan to fall asleep or relax.
There are no loops and the sound volume is very stable. Here is how it sounds (best with headphones):
Inside its housing spins a real fan and creates a whoosh-sound that escapes together with a little bit of air through multiple openings on the side and on the top. The Marpac Dohm Classic is a fan-based sound conditioner.
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