Unverified80% confidenceDecision RuleTime unknown
喇叭功率≥20W且带被动辐射器，才能在户外空旷环境保持足够音量不失真；室内使用10W左右即可
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Unverified户外空旷环境音量衰减快，选喇叭额定功率≥20W且标称声压≥90dB的机型才能压过环境噪音；室内使用10W即可满足88% similarUnverified开阔户外场景需20W以上功率才能压过环境噪音，室内桌面听歌10W以内足够；单纯堆W数但低频下潜差（频响下限＞60Hz）在户外仍显单薄85% similarUnverified室外开阔环境无墙壁反射声音扩散快，需20W以上功率才能形成足够声压；室内5-10W即可，室外买室内功率音箱会明显觉得音量不够83% similarUnverified无风扇被动散热面板灯静音适合收音场景(直播/录课)，但功率通常≤30W；大功率灯(≥60W)多带风扇，安静环境录音会收进噪音80% similarUnverified纯声光报警器（无联网功能）声压需≥120dB才能在户外或有效吸引50米内注意，低于100dB在嘈杂环境几乎无效78% similar
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