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Footnotes (1) Frequency response and range measured on-axis in half-space environment with recommended EQ (2) Sensitivity measured on-axis in half-space environment averaged 100 Hz – 10 kHz using recommended high-pass protection (3) Maximum SPL calculated from sensitivity and power handling specifications, exclusive of power compression (4) Bose Professional extended-lifecycle test using pink noise filtered to meet IEC268-5, 6-DB波峰因子，持续500小时的持续时间（5）AES标准2小时持续时间IEC系统噪声（6）在通用音频应用中使用时，每EN60529测试至IP55。在每EN5 54-24中测试了在整个空间环境中测量的火灾和疏散通知申请（7）
自由空间FS4CE内置扬声器
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