The mic's recording quality is okay. Although the Sony H9 are the most premium headphones in the INZONE lineup, their mic has a worse recording quality than the more budget-friendly Sony INZONE H3, even after firmware update 01.002.005. However, wired models tend to perform better in this regard than wireless models, as they receive audio directly from the source, resulting in less data loss. Still, the H9's mic does an alright job of capturing your voice, so you sound clear and natural, although a bit bright. There's a bit of distortion present, but whoever you're talking to will have no problem understanding you clearly.
Keep in mind that although the H3's 'Recorded Speech' file has white noise present, this noise is due to the mic picking up sound coming from the speaker inside our dummy head. However, this model has a noise gate that can cut out that sound.
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