A2C is WAY more detailed. APM might slam more? They are very different headphones. I don’t think anyone should consider the APM exclusively for sound quality. This is strictly an ANC wireless device that’s best used for situations like long plane rides. Any comparisons with wired headphones won’t really be all that fair - although I know a lot of people will assume or imagine the APM might compete, but honestly even a $100-$200 wired headphones is likely to have better sound quality (as long as it’s a good one).
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