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TPA3118 驱动扬声器时功率方面的疑惑?



大家好,

     最近在使用TPA3118时,我外接4Ω 15W 的扬声器, 用12V电源供电芯片,结果发现输入电流很小,声音播放等都是正常的(整体都正常),但是输入功率怎么会这么小。不是应该挺大的吗(输出桥式接的两个扬声器)  大家帮忙分析下是我哪里的理解错误了。