Panasonic RP-HXS400 Wired Headphones于 2014 年 10 月 13 日首次发布。此版本的Panasonic RP-HXS400 Wired Headphones具有 40 个驱动器尺寸、32 欧姆阻抗、110 dB 灵敏度和 9Hz-26,000Hz 的频率响应，提供更清晰和更清晰的声学体验。
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