(lot of 4) Massdrop collaboration headphones, including: (1) Massdrop x MrSpeakers "Ether CX" closed-back headphones, with high-gloss carbon fiber ear cups, V-planar driver, impedance: 23ohms at 1kHz, input sensitivity: 92dB at 1mW, with 4-pin XLR cable, in soft shell Slappa case, original retail price: $900.00, case: approx 5"h, 9"w, 8"d; (1) Massdrop x Meze Audio "99 Noir" closed-back headphones, with walnut ear cups, self-adjusting stamped manganese spring steel headband, frequency response: 15Hz-25kHz, impedance: 32ohms, sensitivity: 103dB at 1kHz, with detachable 6ft cable and 3.5-6.35mm plug adapter, in original nylon carrying case, original retail price: $200.00, case: approx 3.5"h, 8"w, 7"d; (1) Massdrop x AKG "Limited Red Edition K7XX" open-back headphones, with adjustable leather headband, memory foam ear pads with velour covering, frequency response: 10Hz-39.8kHz, sensitivity: 105dB/V, impedance: 62ohms, with 6.3mm adapter cable, in soft shell Bubm case, case: approx 5"h, 9"diam; (1) Massdrop x Hifiman "Edition XX" open-back headphones, having angled ear pads, spring steel and hand-stitched leather headband, frequency response: 8Hz-50kHz, impedance: 20ohms, sensitivity: 93dB at 1kHz, with detachable 5.5ft cable, in soft shell Eekria case, some wear to ear pads, case: 6"h, 9"w, 9"d; 6.1lbs total Start Price: $150.00

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