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扬声器口径单位换算表:圆形:55mm(2英寸),65mm(2.5英寸),80mm(3英寸),100mm(4英寸),130mm(5英寸),165mm(6.5英寸),200mm(8英寸),250mm(10英寸),300mm(12英寸);椭圆形:65mm×100mm(2.5英寸×4英寸),100mm×160mm(4英寸×6英寸),120mm×190mm(5英寸×7英寸).扬声器代换原则:那要看一看原喇叭和新代换的喇叭的外形、安装尺寸、阻抗、功率是不是合适,尤其是外形、安装尺寸、阻抗,要保证外形相同或者差不多(如果相差太多,就要同时更换2只),安装尺寸和阻抗完全相同,功率相同或者大于原来的喇叭。扬声器的代换原则是:阻抗相同、安装尺寸相同(如果按照空间大的话,可以用大的代换小的)、功率相同或者略大(可以用大功率的代换小功率的,反之则不行而且容易烧坏扬声器和功放电路)。决定放音效果的原因有很多,比如:电源、音源、功放、喇叭、音箱、放音环境等等,单纯考虑1、2个方面不行,要综合考虑才行