Audiophilepure

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” To me the HE-400i is tuned more linear than the 500 and the 500 is more laid back sounding. The 400i has a smoother and more musical presentation in the mids section with more body. It is less dry in a way (not that the HE-500 is dry). The 500 is known for its slightly more in the back mids so that’s no real surprise to anyone. Treble do is more detailed on the HE-500 imo.”