Our old hair dryer was finished. One day he made a terrible noise. After disassembling, I noticed that 2 fan blades have indentations on the outer edge. Anyway, that old hair dryer was loud and noisy. I really wanted something quieter, especially since I use my ears for the sound engineering and use a hair dryer almost every day. After seeing many reviews of silent hair dryers, Panasonic seems to be at the top. But many of them are rated for 100V and intended for the Japanese market. If you plug one of these into a US outlet, the hair dryer will be too hot and may overheat. I didn't want to risk it, although other people report that they work well. My engineering experience says that a 100v device will run 20% hotter on our 120v supply, drawing 18 amps instead of 15 amps. This Panasonic EH-NA65K seems to be the only one rated at 120V, actually 125V but that doesn't matter as the output drops to 14.5 amps instead of 15 amps, which is for sure. Now the big question: how quiet is it? I took two measurements: one is the decibel level and the other is the frequency spectrum. I'm reading decibels from about 3 inches away with the hair dryer pointed away from the microphone. It read 84 decibels on the C scale, fast. But slow, fast, A-weighted or C-weighted, it was about 82-84 decibels. How does it compare to my previous hair dryer? 10 decibels less. The old dryer measured 92-94 decibels. That 10 dB drop is huge. This is what most people refer to as "half" the sound level. In my opinion, it is much quieter than my previous hair dryer. In fact, I don't hate drying my hair anymore because the hair dryer is much quieter. What about the frequency spectrum? It's not that annoying either. This is reflected in my measurement from 600Hz to 1kHz. My previous hair dryer had a peak in this range, where this hair dryer is mostly flat between 600 Hz and 6 kHz. But how does it dry? I did not do any objective dry season testing. My guess is that it takes about the same or slightly more time to dry my short hair. But the hair feels softer than an old blow dryer. This can be very subjective, and perhaps I was open to suggestions. I do not know. Bottom line, this hair dryer is a lot quieter than my old hair dryer, which is a good thing.
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