: Use professional-grade equipment like the AKG K72 to listen for nuances in vocals or acoustic instruments during the preparation process.
: Ensure the file is indeed an MP4 (MPEG-4 Part 14) , which is a standard container for high-quality audio and video. k.72.mp4
If you are preparing a digital audio/video file for performance or study: : Use professional-grade equipment like the AKG K72
: If you are "preparing" a piece (mixing or mastering), you may be using AKG K72 Closed-Back Studio Headphones , which are popular for their neutral sound and high-frequency detail. k.72.mp4