Panasonic RPDJS400D Wired Headphones于 2012 年 3 月 12 日首次发布。此版本的Panasonic RPDJS400D Wired Headphones具有 40 驱动器尺寸、32 欧姆阻抗、102 dB 灵敏度和 10Hz-27,000Hz 的频率响应，提供更清晰、更锐利的声学体验.
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