HIFIMAN'S EF400 Balanced Desktop DAC/Amplifier Epitomizes Performance and Flexibility in One Compact Chassis - HomeTheaterHifi.com
HIFIMAN EF400 Balanced Desktop Headphones and Amplifier with Himalaya R2R DAC 3.5/4.4/6.35mm Output for Home Audio, Silver : Amazon.com.be: Electronics
Review: HiFiMan EF400 - Odd One Out - Headphonesty