High Quality Audio. More than just outstanding video, Blackmagic Video Assist 4K is also an extremely high quality audio recorder. You get two mini XLR inputs with 48V of phantom power so you can attach external microphones to record audio with Video Assist, instead of your camera. This totally eliminates the problems with auto gain controls on DLSR cameras! With an amazing equivalent input noise floor of -128dBV, you get high quality, crystal clear audio that sounds dramatically better than camera audio! Sound is recorded into the same file as the video so you don’t have to worry about AV sync between separate audio and video files!