Both, HD580 is just a more neutral headphone from both the driver and the different tuning. I've transplanted the HD650 driver into the HD580 and it did sound more neutral but also wrong, lacked cohesion somehow. Keep in mind there are over 6 different HD580 variants, who knows if you're taking about the same headphone. I've hot three variants and they sound distinctly different but with the HD580 house sound.
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