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What do the product measurement mean?

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What do the product measurement mean?
Update Time:2019-06-06
   Generally it’s a good idea to ignore most of the specifications listed with headphones. It may sound a little unusual and you might consider it hard to choose headphones without something to go by, but the only product information that really matters are details like 
whether the headphones are circumaural or supra-aural, whether they’re open or closed, how heavy they are, how long the cable is (or range if they’re wireless) what kind of earpads they have and perhaps impedance/efficiency.

    It’s a common misconception that the wider the frequency response the better the headphones will sound. Unfortunately this is a long way from the truth, it also makes choosing products more difficult as some models have the exact same frequency response yet sound completely different. For example one headphone may quote a frequency response of 5-32000Hz while another quotes 5-35000Hz. From this measurement you could assume that both have low bass but one has more high end. In reality the two headphones could sound nothing alike.

   Why is this? Because a frequency range only tells you theoretical maximum and minimums, it doesn’t tell you how even that response is. Coupled with that the range of human hearing is only 20-20000Hz, and most source equipment isn’t even capable of reproducing those ranges (certainly not most basic portable players or PC soundcards).One technical measurement that may help is impedance. Generally the higher the impedance the harder the headphones are to drive, however there are some high impedance headphones that are very efficient and some low impedance headphones that are very inefficient so keep an eye on the efficiency as high efficiency means they may be easier to drive.

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