Level AAAPerceivable
1.4.7

Low or No Background Audio

In audio with speech, keep background music and noise low (or removable) so the words stay clear.

In plain English

When audio is mainly someone talking, background music or noise can drown the voice for hard-of-hearing listeners. This AAA rule says the background should be off, turn-off-able, or clearly quieter than the speech (about 20 dB below, which sounds roughly four times softer).

If you produce narrated videos or audio with a music bed, the fix is a good audio mix that keeps the music well under the voice.

Who this is for

  • Hard-of-hearing listeners, who cannot separate a voice from loud background sound.
  • Everyone in a noisy environment trying to catch the words.

How to check and fix it yourself

Listen to your narrated content. Can you clearly make out every word over the music? If the bed competes with the voice, lower it in the mix.

Voiceover with music mixed well below it.       ✓
Music at a similar level to the voice.          ✗ lower the background
No background sound at all.                      ✓

Where we can help

We review your speech-based audio for background levels that bury the voice and flag where the mix needs adjusting. It rounds out the media and clarity checks.

How to meet it

Techniques the W3C accepts as sufficient (summarized). Follow a link for the full method.

Frequently asked questions

What does low or no background audio require?+

Success Criterion 1.4.7 (Level AAA) applies to prerecorded audio-only content that is mostly speech. It says the background sound must either be absent, be turn-off-able, or be at least 20 decibels quieter than the speech (roughly four times quieter to the ear).

Why does background music matter?+

People who are hard of hearing struggle to separate a voice from music or noise behind it. Loud background audio can make speech unintelligible for them even at a comfortable volume. Keeping it low (or removable) keeps the words clear.

Does a typical store need this?+

It applies to speech-focused audio you produce (a narrated explainer, a podcast). If your videos have voiceover with a music bed, mixing that music well below the voice satisfies it. It is Level AAA.

Reference

This is a plain-language explainer. The authoritative source is the W3C Web Content Accessibility Guidelines (WCAG) 2.2.

WCAG 2.2 © W3C. Excerpts are paraphrased; see the linked documents for the normative text.

Not sure if your store passes 1.4.7?

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