新版HD25是否改用铜线了?求帮忙鉴定真伪

aasswwwww2

23年买过一副HD25，和LIGHT版相比好听多了，最近又入手一副，明显没那么好听了，声音松散、低频偏多，只比LIGHT版好听一点点，细看海棉薄了，能看见里面的单元，其它细节也有点不一样，还有是旧耳机线是钢丝的，能用磁铁吸起的，新的是铜丝线，磁铁吸不起。我很怀疑新的是假货，不知道还有什么方法可以鉴别?

aasswwwww2

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