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HiFiMAN HE400i Over Ear Full-size Planar Magnetic Headphones

 Frequency Response: 20Hz - 35KHz
 Impedance: 35 Ohms
 Efficiency: 93dB/mW
 Weight : 13.5Oz (370g)

Manufacturer's Description

HIFIMAN HE400i is a full-size planar magnetic headphone intended for high performance listening in the home or studio.
The HE400i is 30% lighter than comparable headphones allowing the listener to comfortably enjoy music for hours on end with minimal listener fatigue. 

Along with the lighter weight, a newly-designed headband with an improved pressure pattern is a key to the phone’s best-in-class comfort.

The FocusPad, new beveled hybrid ear pads made of pleather and velour, provide both increased comfort and improved sound quality.

The gloss ear cups are finished in a smoky gray, Mylar finish that gives the HE400i a striking contemporary look.