无源辐射器（passive radiator） 无源式超低音音箱（passive subwoofer） 指需另用一台单独的功率放大器去推动的那些超低音音箱。
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这款SC-NT10坚固无线喇叭配有一对小型全频扬声器、一个被动辐射器（passive radiator），在无线连接上做得非常到位，采用了当前流行的NFC近场通讯模块，支持蓝牙，对于智能 设备配对更为有利。
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Double passive low-frequency radiator 双无源低频辐射器
以上来源于: WordNet
The long-throw 4-inch subwoofer and passive radiator are specifically designed for punchy bass reproduction.
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The dock features reinforced bass through a passive radiator and high power amplification for powerful full digital sound.
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The stereo unit is built around a two-way system featuring a soft dome tweeter and a powerful compact woofer loaded by a passive radiator, for each channel.
ENGADGET: Philips showcases its 2013 Fidelio audio lineup at CES, we go eyes-on
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