Hence, the following two rules of thumb: A sound needs to increase by more than 3 decibels for it to be noticeable. For every increase of 10 decibels, the apparent sound loudness doubles.

How does the Shazam algorithm work? The Shazam algorithm distills samples of a song into fingerprints, and matches these fingerprints against fingerprints from known songs, taking into account their timing relative to each other within a song.

Keep the volume between 70–75 dB to protect your hearing. A decibel level of over 85 dB can be dangerous for human ears. And an audible level of 130 dB is considered painful. Most specialists recommend earplugs if you are continuously exposed to 85 dB or above.

As a rule of thumb, your sound should sit between -24dB and -8dB. If your video includes dialogue, then that should hover around -18dB and -9dB. Should you include music, consider setting that between -18dB and -22dB.