Besides the sound insulation set, the bass of the cushion, the feeling of the rubber, you must choose the right size for your ear then you can get the best sound quality.

除了隔音设置，低音垫，橡胶的感觉，你必须选择你的耳朵大小合适的，那么你就可以得到最好的音质。

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The MDR-XB60EX Sony Extra Bass headphones are supplied with hybrid silicone rubber ear buds in four different sizes for a secure and tailored fit, along with uniquely designed noise isolation ear buds in three sizes.

ENGADGET: Sony ships new Extra Bass headphone lineup to the US, delivers that Direct Vibe to your brain