Monolith™ by Monoprice™AMT HeadphonesMonolith™ AMT Headphones use a state of the art Air Motion Transformer driver enclosed in a gorgeous, open back housing. It features a plush, padded headband and earpads for comfortable listening over extended periods of time. With an extended soundstage, lush, rich sound, and excellent build quality, the Monolith AMT Headphones bring a massive price‑to‑performance ratio to the headphones market.ATM DriverOpen Back DesignComfortChangeable Earpads AMT DRIVERMonolith™ AMT Headphones use a full range Air Motion Transformer driver to deliver open, spacious sound. An AMT driver uses a thin, folded diaphragm to deliver the full spectrum of sound, with superb accuracy, low distortion, and stunning, audiophile‑quality sound. AMT DRIVER93 x 63 mmFREQUENCY RESPONSE15Hz ~ 40kHzNOMINAL IMPEDANCE32ΩMAGNET TYPEHigh‑grade N52 NeodymiumSENSITIVITY90dB/mWCONNECTORSMini 4‑pin XLR.