Why this works now
Ученик из РФ, атаковавший преподавательницу холодным оружием, ранее угрожал сверстникам08:56
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叶卡捷琳娜·格拉夫斯卡娅（科技栏目编辑）
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Continuing to run through tracks like JVKE’s “her” and “Radio” by Bershy, I noticed a common theme amongst the headphones. The 680NC’s soundstage was narrow and bassy, while the 780NC was wide and hollow. Both reproduced one half of a great couple, but unfortunately, they’re currently separated and seeking lives of their own. No, but seriously, the audio quality on both of them is still decent individually. I can distinguish each instrument from each other, so they aren’t getting muddied in the mix. But I don’t think the 780NC is worth the extra $90 on sound quality alone, since you’re trading one issue for another.
C_{ij} = \sum_{k=1}^{n} A_{ik} B_{kj}