One of the most commonly used audio effects is muffling. It can be used to make audio sound like it’s underwater, to make voice sound like they’re coming through a wall, to make it sound like speakers are far away and much more.

Fortunately, getting that muffled voice effect is very simple – all you have to do is apply a very simple EQ curve and you’ve got it! 

What you’re hearing when audio sounds muffled is the removal of the high frequencies in a sound. When you hear sound from a sound source that is in a different room or a long way away the high frequencies are removed because higher frequency waves lose energy more quickly.

In this guide we’re going to take you through the simple voice equalization techniques to get that muffled, or underwater sound.

For more general tips on voice equalization, check out our guide.