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Hey folks, lots of questions floating around about drivers and sound signatures. While we can't talk about the drivers (per the agreement we had to make with HiFiMAN) we can show measurements. Please take a look at the FR and THD measurements in the description (toward the bottom, above the specs section).
Additionally please see the attached FR and THD comparison between the HE4XX and HD6XX.
Those FR aren't looks good for their price. a cave at high frequency and bun at mid low so this should sounds a little bit muffle with a open-back 6db bass cut.
They don't look like planars at all TBH. No flat bass extension familiar to planars and no 5k ringing? I am smelling something fishy here.