Must Have Bundle Kit For Audio-Technica ATH-M50 ATH-M50x Professional Studio Monitor Headphones Includes FiiO E6 Portable Headphone Amplifier + Slappa Full Sized HardBody PRO Headphone Case (SL-HP-07) This Kit Includes Some Of The Essential Accessories You Need To Take Full Advantage Of Your New Audio-Technica ATH-M50, ATH-M50x Professional Studio Monitor Headphones Slappa Headphone case. TOP RATED HEADPHONE CASE For Audio-Technica ATH-M50, ATH-M50x Professional Studio Monitor Headphone ON AMAZON!! FiiO E6 is a Portable Headphone Amplifier designed to improve the sound quality and volume of any portable audio source such as MP3 players, iPods, personal media players, mobile phones, laptops, notebooks/netbooks, or portable CD players. - TOP RATED HEADPHONE AMPLIFIER ON AMAZON!! FiiO E6 Amplifier - Built-in EQ with two level bass boost and electronics volume control &gt; New amplifier circuit, low noise and distortion with enhanced dynamics &gt; Small, compact, and sleek, with removable clip for convenient and easy use &gt; Designed for high impedance and low sensitivity headphones Slappa Full Sized HardBody PRO Headphone Case (SL-HP-07) : Stylish black rubberized PVC exterior finish Molded Duro-Shock xEVA Hard Body Shell Velveteen lining Fits most all full sized headphones