Clear evidence
Attention, processing and evaluation
Delivery, intonation and vocal character determine how well listeners process a commercial and how they judge the ad and the brand. This is the best-supported part of the research.
Research · voices in commercials · October 2026
What does a voice do for your brand?
Every day, we cast and direct voices for radio and TV commercials. The research confirms what we hear in the studio: voice choice and delivery shape how a commercial is processed, remembered and judged. But only when the voice fits the brand. Here is what the science says.
- 13core studies
- 987radio listeners in one experiment
- 16radio commercials in the intonation study
- 400participants in the voice experiment
What a voice does for your brand
Voice choice and sound design can influence how commercials are processed, how credible they are and how the brand is experienced. The evidence is strongest for attention, memory and evaluation. How large the effect is depends on the voice, the delivery and the context.
Promising
Brand voices and familiar voices
A recognizable voice can lift ad liking and brand evaluation. How much recognition a consistent brand voice builds over time has rarely been measured. That is why a brand voice deserves careful casting and consistency.
Recognized is not yet linked
A voice can be pleasant and recognizable without people connecting it to the right brand. That is why we keep recognition of the voice, the link to the brand and the meaning the voice carries apart.
Question
What you measure
What does not automatically follow
Is the voice recognized?
Recognition of the speaker
Recognition of the right brand
Is the brand recognized?
Correct brand attribution
Desired brand associations
Is the message remembered?
Memory for the content
Preference for the brand
Does the speaker sound credible?
Evaluation of the speaker
Trust in the brand
Does purchase intent rise?
Reported willingness
Actual purchase
Do sales go up?
Behavior in the market
Return after costs
The best voice is not the most beautiful voice. It is the voice that lets people recognize, understand and experience the right brand.
What the research lets you hear
Six lines of research that show how voice and delivery make or break a commercial. And where direction makes the difference.
01
Variation without exaggeration
In sixteen radio commercials, varied pitch supported attention and memory better than a flat delivery. Moderate emphasis also worked better than no emphasis or exaggerated emphasis. Not monotonous, but not stressing every word either.
Rodero, Potter & Prieto, 2017 · Rodero & Potter, 2021
02
Pace matters
Of three speaking rates tested, 180 words per minute performed best on processing and evaluation. That is not a fixed standard for every commercial. It is a reason to test for comprehension and not just for length.
Rodero, 2020
03
No universal winner
Male voices are not automatically more persuasive. In Spanish experiments, some evaluations were actually more favorable for female voices. Pitch and voice gender also work independently. The question is which specific voice carries your brand best.
Martín-Santana et al., 2015 and 2017 · Rodero et al., 2013
04
A voice touches emotion
In a Japanese experiment with 400 participants, vocal characteristics influenced willingness to buy, partly through emotional responses. How a voice sounds helps shape what people feel about a message.
Nagano et al., 2023
05
The moment of recognition
When listeners recognized a familiar voice themselves, without the name being mentioned, a positive moment of insight followed. That improved ad liking and brand evaluation. The effect lies in that moment of recognition.
Hall, Carlson & Gentry, 2024
06
Culture and accent
French students preferred a calm sales style, New Zealand students did not. Dutch theses found mixed effects of accent. An international brand voice takes more than the same vocal style in another language.
Desmarais et al., 2024 · Radboud University theses
How true are the familiar voice rules?
There are plenty of rules of thumb about voices in commercials. Some hold up, some are too simple. Here is how they compare with the research.
Delivery drives attention
Intonation and emphasis affect how well a commercial is processed.
True
The voice colors the brand
Vocal characteristics influence ad and brand evaluation, depending on the context.
True
A familiar voice helps
Recognition can raise appreciation, but not every familiar voice works better.
Under conditions
Male voices persuade better
The research shows no general advantage for male voices.
Myth
A low voice always works
Studies found effects in opposite directions. Pitch needs to be tested per context.
Myth
Music strengthens every spot
Music did not give a uniform improvement. Voice and music work as a combination.
Myth
This classification is our summary of the sources on this page: an indication, not a meta-analysis.
The power of a consistent brand voice
For many brands, a consistent brand voice is the logical next step. Vocal character and delivery demonstrably influence how people judge a brand. How much recognition a consistent voice builds over time has rarely been measured. That is why we build a brand voice deliberately.
CONSISTENCY OF PERSON
Always the same voice
The same voice actor, campaign after campaign. Listeners hear who is speaking before the logo appears. The consistent voice of Lidl shows how that works in practice.
CONSISTENCY OF EXECUTION
Always the same style
Different voices with the same recognizable style, pronunciation and sound. Useful for multiple languages or many variants, for example with AI voices.
The real test of a brand voice: do people recognize your brand even without the brand name, slogan or music?
Voice, music and AI
A voice never stands alone. Music, sound design and increasingly AI help shape how a commercial sounds. Here too, the research points the way.
MARTÍN-SANTANA ET AL. · 2015
987
Voice and music as a combination
In an experiment with 987 radio listeners, music did not deliver a uniform improvement. It helped recall, but donation intent was higher without music.
That is not a case for leaving music out. It shows that you choose voice and music together, rather than picking the most beautiful voice and the most beautiful track separately.
PAJUPUU ET AL. · 2023
AI
Judge synthetic voices separately
Estonian research found a preference for a calm over an energetic AI advertising voice. A comparison with human voices was missing.
To compare AI voices and real voices fairly, keep the script, direction and finishing the same. Hear the difference in our demos with AI voices and real voices.
Much of the research was done with radio commercials. For TV, compare the same picture with different voices and also test how voice and picture work together.
How we use this for your brand
You do not find a good voice on gut feeling alone. The difference lies in casting, direction and mix.
01
Casting on brand personality
Not a brief like ‘an authoritative male voice’, but a description of what your brand should convey: expert, approachable or energetic. That keeps every good voice in the running.
02
Several voices per profile
We have several suitable voices record the same script. That way you choose the profile you are looking for, not one random person.
03
Directing the delivery
Varied intonation and moderate emphasis: not monotonous and not stressing every word. That is what we direct for.
04
A pace that lands
We do not just check whether the script fits into twenty or thirty seconds. The question is whether the message lands.
05
Voice and music together
Only once the voice is right do we add music and sound design. That way you hear what casting, direction and mix each contribute.
06
Recognition without the brand name
A brand voice should be recognized even without the brand name, slogan or music. That is the real test of a brand asset.
The research at a glance
The studies answer different sub-questions. So they are not thirteen confirmations of one general voice effect.
Study
Design
Key finding
Limitation
Chattopadhyay et al., 2003
Articulation rate, pauses and pitch
Faster articulation with a low pitch improved attitudes toward the ad and the brand; pauses had no significant effect.
No measurement of long-term brand building or sales.
Rodero, Larrea & Vázquez, 2013
Voice gender, attention and recall
Critically questions the assumed advantage of male voices.
Assessed via publication record and abstract.
Martín-Santana et al., 2015
987 radio listeners, sixteen versions
Vocal characteristics and music did not affect all outcome measures in the same way.
One message, four speakers, no purchase context.
Martín-Santana et al., 2017
Voice gender and pitch
Low voices helped recall; some attitude effects differed by voice gender.
Some effects were only marginally significant.
Rodero, Potter & Prieto, 2017
Sixteen radio commercials, intonation
Varied pitch supported processing and memory better than an even pattern.
Word memory is not brand attribution.
Rodero, 2020
200 participants, three speaking rates
The middle rate of 180 words per minute scored best.
English and Spanish; no Dutch standard.
Rodero & Potter, 2021
52 participants, four emphasis strategies
Moderate emphasis supported processing better than no emphasis or exaggerated emphasis.
Small sample; no sales measurement.
Nagano et al., 2023
400 Japanese participants
Vocal characteristics influenced willingness to buy, partly through emotional responses.
Two speakers; reported intent, no purchase.
Pajupuu et al., 2023
Eighteen raters, synthetic voices
A calm style was on average found more pleasant than an energetic one.
No human comparison; very small sample.
Desmarais et al., 2024
312 students in two countries
The preference for a calm or emphatic sales style differed by country.
Four voices; several characteristics changed at once.
Hall, Carlson & Gentry, 2024
Familiar voices without a name
Recognizing the voice improved ad liking and brand evaluation.
Not every familiar voice automatically works better.
Radboud University thesis
123 participants, Limburg and Randstad accents
No general difference in ad attitude, purchase intent or recall.
Thesis, not peer-reviewed.
Radboud University thesis
270 participants, accent in TV commercials
Accent influenced speaker evaluation and brand recall.
Thesis; not all effects were the same.
About this overview
This critical literature review is about the voice and sound in commercials, not about the return of radio or television as a medium. It focuses on vocal character, delivery, accent, speaker familiarity and music. The reference date is October 31, 2026.
We used original experiments, publication records, a research review and Dutch theses. Where only an abstract was available, the assessment is limited to that. This is not a systematic review or meta-analysis; our classifications summarize the sources.
Read more
More about voices and sound for your brand.
SERVICE
Voice-overs, AI voices and casting
From voice choice to final mix: how we find and direct the voice that suits your brand.
DEMOS
Real voices and AI voices
Hear for yourself how voice choice and delivery change a commercial.
NEWS
The power of a recognizable voice
How Lidl’s consistent voice signals the brand before the name is even said.
RESEARCH
What does sonic branding do for your brand?
The same kind of overview for sonic logos and audio identity.
FAQ
Are male voices more persuasive in advertising?
No, not automatically. What matters is which voice carries your brand best.
FAQ
How fast should a voice-over speak?
Fast enough for the message to land. What research says about pace and delivery.
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