8.2Score Massdrop x HIFIMAN HE4XX Review Michael February 9, 2018 Headphones, $101-200, Planar 30 The Massdrop x Hifiman HE4XX is a stunning revision of the original Hifiman HE400 launched under the Massdrop label for a price of only $169. Disclaimer: The Massdrop X Hifiman HE4XX sent to us is a sample i...