HiFiMAN is well known for their value planar magnetic headphones, and today, we will take a look at the latest and greatest HE400i offering—namely, the 2020 Edition. The 2020 Edition incorporates the headband assembly we first saw on the HiFiMAN Deva. Another minor change that perhaps many DIYers will enjoy is the fact that the 2020 Edition features mini-jack ear cup plugs instead of 2.5 mm, which should make it easier to make your own custom cables.
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https://www.techpowerup.com/review/hifiman-he400i-2020-edition/