Amazon.com: Audio-Technica ATH-M30x Professional Studio Monitor Headphones for Studio Tracking and Mixing (Black) Bundle with Blucoil 4-Channel Headphone Amplifier, and 6-FT Headphone Extension Cable (3.5mm) : Musical Instruments
Audio Technica ATH-M30X Studio Monitor Headphones+4-Way Distribution Amplifier - Rockville Audio
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Amazon.com: Audio-Technica ATH-M30x Professional Studio Monitor Headphones, Black : Audio-Technica: Musical Instruments