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How about compared to HE-500?Hi,
Just want to say something very quick about that bass response of HE-400i. This is something we actually debated very heavily internally during the initial design process and also seeked feedback from a lot of our customers. At the end we decided that quality is more important than quantity, and HE-400i should produce a more accurate bass.
So yes the sheer amount of bass you will get from HE-400i is slight less than HE-400, BUT we believe it is definitely more accurate and true to the music. The market is not short of bass heavy headphones, so we decided to stick to what Hifiman does the best.