Superseded90% confidenceCautionTime unknown
部分机型（如iPhone 7及以后、多数一体化设计安卓）听筒兼作立体声外放的上声道，若只换'听筒'而买到无外放能力的纯通话件，会导致立体声缺失、外放变单声道。这类机型需购买带'双功能'标识的原厂件
1
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90%
Confidence
Long-term
Relevance
-
First Seen
This knowledge claim has been superseded by newer content
手机扬声器与听筒虽外观相似但内部结构不同：扬声器（Speaker）功率大、频响宽用于外放，听筒（Earpiece/Receiver）功率小偏中高频用于通话。二者不可互换，购买前必须核对拆机图上的元件位置代号（如iPhone的通话Receiver在顶部、外放Speaker在底部）Sources
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