The DT 108 single-muff headset is designed for live, remote broadcasting, for studio, film and TV-applications. One side is open to monitor ambient sound. The protective ear cup attenuates up to 20 dB of ambient noise. The headset features a noise cancelling microphone. Available in different impedances The ultra-compact HM-4 4-Way Headphone Amplifier features a 1/4 stereo input and four 1/4" headphone outputs with individual level controls. Perfect for studios or even at home when up to four people want to listen together.