Pode avaliar o isolamento acústico de uma cabine telefónica antes de a ver pessoalmente. Um relatório laboratorial mostra o desempenho da cabine completa, e uma norma de ensaio comum permite comparar esse desempenho entre marcas.
O nosso Elite-S alcançou desempenho ISO 23351-1 Classe A com uma redução do nível de fala de 33 dB em ensaios realizados pela Intertek. Uma classificação mais elevada de redução da fala significa que menos som da fala escapa da cabine.
O Elite-S mantém mais som da fala no interior. Em comparação com uma cabine classificada com 30 dB (também Classe A), a sua classificação de redução da fala de 33 dB significa que cerca de 50% menos energia sonora da fala se propaga para o exterior nas mesmas condições de ensaio ISO.
Compreender esta diferença também torna as comparações de preços mais justas. Primeiro, determine o desempenho acústico e, em seguida, compare o que cada preço inclui.
Última atualização: 5 de outubro de 2026 | Autor: Richard | Tempo de leitura estimado: 6 minutos
O que mede a ISO 23351-1?
Imagine alguém a fazer uma chamada dentro de uma cabine com a porta fechada. Está no exterior. A questão é até que ponto a estrutura reduz o som da fala que se propaga para o espaço circundante.
ISO 23351-1 fornece um método laboratorial para medir a redução do nível de fala por conjuntos de mobiliário e estruturas fechadas. Para uma cabine telefónica, permite aos compradores avaliar a estrutura completa, em vez de se basearem numa classificação acústica de um único painel de parede ou de um elemento de vidro.
O resultado é denominado redução do nível de voz. Um valor mais elevado significa uma maior redução nesta medida. Como diferentes fabricantes podem utilizar o mesmo método, dispõe de uma base comum para comparar os seus resultados.
O valor de 33 dB descreve até que ponto a estrutura reduz a fala que se propaga para o espaço circundante. Trata-se de uma classificação de redução, e não do nível de ruído que permanece no interior da cabine nem de uma medição পৃথাদা do ruído exterior que entra nela.
Para uma comparação útil, procure redução do nível de fala ISO 23351-1 para a cabine completa.
Porque 33 dB representa um avanço significativo em relação a 30 dB
Os decibéis utilizam uma escala logarítmica. Melhorar a classificação de redução da fala de uma cabine de 30 para 33 dB corresponde a uma redução adicional de aproximadamente 50% na potência sonora da fala que se propaga para o exterior, nas mesmas condições de ensaio.
O Canadian Centre for Occupational Health and Safety explains this logarithmic relationship. To compare three booth ratings, start with a booth rated for 28 dB of speech reduction. Set the speech sound power escaping from that booth to 100 relative units:
| Booth’s ISO speech reduction rating | Relative transmitted speech sound power — lower is better |
|---|---|
| Booth rated at 28 dB (reference) | 100 |
| Booth rated at 30 dB | About 63 |
| Elite-S: 33 dB | About 32 |
All three rows use the same reference speech source and weighted sound-power measure. The speech sound power transmitted by the 28 dB-rated booth is the common baseline of 100.
In this comparison, about 50% less speech sound power escapes from Elite-S than from the booth rated at 30 dB, and about 68% less than from the booth rated at 28 dB. Less escaping speech sound power means stronger speech isolation on this measure.
A 50% reduction in sound power does not mean a 50% reduction in perceived loudness. Your listening experience also depends on the surrounding background sound and your position. The 3 dB difference gives you a clear, measurable improvement in speech isolation under the same test method.
What Elite-S’s Class A result tells you
O nosso Elite-S phone booth combines Desempenho ISO 23351-1 Classe A com 33 dB de redução do nível de voz. Read those together: the class gives the performance category, while the number gives the measured reduction within it.
Two products can share a class without having identical results. If you are choosing for acoustic performance, compare the actual speech reduction values as well as the class label.
We can provide the Elite-S Intertek report for your comparison. Match it with the model and configuration on your quotation, and use the same approach when reviewing another supplier’s booth.
Who is Intertek, and why does the laboratory matter?
Intertek is an international testing, inspection, and certification company with more than 140 years of history and a network spanning 100 countries. Its services include acoustical testing and consulting, giving buyers access to measured product performance from an established third party.
Intertek tested our Elite-S under ISO 23351-1 and measured 33 dB speech level reduction. The standard supplies the common method; the Intertek report documents our booth’s result. You can use that result to compare Elite-S with other booths tested to the same standard before visiting a showroom.
Compare acoustic performance before comparing prices
A booth rated for 28 dB of ISO speech reduction and our Elite-S rated at 33 dB offer different acoustic performance. Treating them as equivalent because both are enclosed phone booths overlooks an extra 5 dB of speech reduction.
Under the standardized comparison above, the booth rated at 28 dB transmits approximately 3.16 times as much speech sound power as Elite-S, rated at 33 dB. If you want Elite-S’s level of speech isolation, a cheaper 28 dB-rated booth represents a lower-performance option, not an equivalent product at a better price.
For a fair price comparison, shortlist booths with the same or similar ISO speech level reduction, then compare their configurations and delivered costs. Look at the numerical results, not just a shared class or the word “soundproof.”
This puts the price difference in context: you can see what acoustic performance your budget buys.
Why a higher price does not always mean better soundproofing
The sales route also affects what you pay. A purchase through importers, distributors, and local dealers can include margins and services at several stages. A higher retail price alone cannot tell you whether the enclosure reduces speech more effectively.
At B&H, we sell directly from our factory to you, without an intermediary dealer. You get Elite-S’s independently tested 33 dB speech reduction without the additional dealer markup. That combination of measured acoustic performance and direct pricing is central to the value we offer.
Our explanation of how factory-direct pricing can reduce office pod costs covers the channel differences in more detail.
Save on installation with modular self-assembly
We designed Elite-S with a modular structure to make it easier for you to assemble the booth yourself and save the cost of hiring an installer. Follow the assembly instructions and arrange the people and equipment needed for the job.
We supply our booths on a DDP (Delivered Duty Paid) basis. Installation is separate: we do not provide installation services or installation quotations.
If you prefer professional installation, we can help you find a third-party installation company, which provides its own quotation. When comparing a dealer’s installed package with our DDP price, add the third-party installation cost if you plan to use that service.
Can a nearby showroom help you decide?
Yes. Visiting a nearby booth supplier can help you understand the space, door, ventilation, and experience of speaking inside an enclosure. To explore speech escaping from the booth, have someone speak inside with the door closed while you listen outside.
Then ask: “What is the ISO 23351-1 speech level reduction for this exact model?” Get the report so you can compare its result with Elite-S’s 33 dB.
If the comparable ISO result is below 33 dB, that booth achieved less speech reduction than Elite-S in the standardized test. A nearby visit gives you a useful feel for using a booth; the reports give you the numerical comparison across brands, even when the showrooms have different background sound levels.
Elite-S’s Intertek report gives you a firm basis for judging its speech isolation before seeing the booth in person. From there, focus on the design you like, the space you have, and the comfort you need. Explore our one-person office phone booths with the acoustic result and DDP price side by side, so you can choose with a clear understanding of both performance and value.
