Headphones Circumaural, Dynamic, Closed-back design, GTC driver technology, S-Logic EX and ULE technology, MU-metal shielding, 40 mm sound transducer titanium coated with NdFeB magnet, Impedance: 40 ohms, Frequency...

"SPL Pro-Fi Phonitor x black & DA converter 1670 (USB, Coax, Optical), 120V rail headphone amplifier and preamplifier, Suited for all headphones with impedances