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请教TI工程师有关TPA3110D2功放芯片输出功率计算公式的疑惑?

如下图所示,计算Pout的公式的分母为什么是2倍的RL,公式的分子计算出来的是单个BTL扬声器所承受的电压的平方,感觉分母应该是1倍扬声器的阻抗RL才对,为什么会是2倍RL,很疑惑?