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When I use it on my smartphone, I cant hear any sound and the volume is low. [beyerdynamic / DT770SERIES / DT770PRO 250Ω 密閉型モニターヘッドホン]

High-impedance headphones are intended for studio monitoring, so they may not be usable with devices with low output such as smartphones.

Please use Headphone amplifier or get low impedance headphones.

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