Silen Space Call achieves Class A+ speech privacy rating
Independent laboratory tests confirm outstanding acoustic performance across the Silen Space Gen 2 range, with speech level reduction results ranging from 32.1 to 33.4 dB.
At Silen, speech privacy has always been at the heart of what we do. Our latest acoustic test results take this commitment even further. The new Silen Space Gen 2 collection has achieved outstanding results in independent laboratory testing carried out in Turku, Finland, according to the international ISO 23351-1 standard.
With measured speech level reduction ranging from 32.1 to 33.4 dB, all tested Space Gen 2 models achieved Class A performance, with Space Call reaching the exceptional Class A+ category.
What ISO 23351-1 measures, and why
ISO 23351-1 is the international standard developed specifically for office pods and booths. It measures how effectively a pod reduces the sound of speech travelling into the surrounding workspace. The measurement is based on the frequency range of human speech, so it reflects what really matters in an open-plan office: whether people nearby can hear and understand the conversation inside.
That is why the standard measures from the inside out. A pod’s main job is to keep your call, meeting or confidential discussion where it belongs. The higher the dB value, the better the privacy.
The acoustic classification system based on ISO 23351-1 test results provides a clear way to compare speech privacy performance:
Class | Speech level reduction | What it means |
|---|---|---|
A+ | 33 dB and above | Exceptional speech privacy |
A | 30–33 dB | Excellent speech privacy; speech generally unintelligible outside |
B | 25–30 dB | Good speech privacy |
C | 20–25 dB | Moderate; relies more on background office noise |
Engineered for speech privacy
Space Gen 2 is optimised around exactly that inside-out logic, with structure, materials and assembly designed to keep speech contained. Whether it’s a confidential business discussion, a sensitive HR conversation, an important customer call or simply a meeting without distractions, speech privacy is essential in today’s workplace.
Of course, Space Gen 2 also provides effective noise reduction against external office noise, reducing distractions and helping users focus. However, completely isolating someone from their surroundings is not necessarily the goal.
Chief Commercial Officer at Silen, with 20+ years of furniture industry expertise in growth and sales strategies, and award-winning product design. He shares insights on workspace innovation and sustainability. Connect with Martin on LinkedIn.
