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Telelink Business Services is an IT company with a new office in Sofia. The office has open-plan areas, private offices and several meeting and video-call rooms. We were involved from the design stage of the 2024 fit-out – with room acoustics and the sound insulation of the partitions.
The rooms are small, with glass walls and smooth plasterboard partitions. They have an acoustic ceiling, but in a video-call room that is often not enough: the microphone picks up the reflections from the walls and the speech at the other end becomes unclear.
The interior design called for a large image on one wall of each room – a portrait and a quote. The client asked for the acoustic solution to be the image wall itself, not separate panels on top of it.
Model. Before the fit-out we built a computer model of the rooms from the interior design. The model showed that with the acoustic ceiling alone the rooms would not reach the values for a video-conference room. With absorption over a whole wall, the larger rooms do.
Measurement. After the fit-out we measured the reverberation time in the rooms to EN ISO 3382-2 – with a loudspeaker, a reference microphone and a class 1 sound level meter. The target for a video-call room is about 0.3–0.4 s in the speech range. This is the recommendation of video-conferencing system manufacturers, not a regulation.
The images are the client's own design – a portrait and a quote for each room. We prepared them for print in the exact proportions of each wall, so that no part of the face or the text is cut off, and checked the resolution – at least 300 dpi at actual size.
The fabric can be replaced on site without removing the frame. If the client decides to change the image in a room, only the fabric is replaced.
12-person room (about 69 m³, wall about 19 m²) – reverberation time, s
| Frequency | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz |
|---|---|---|---|---|---|
| Before | 0,61 | 0,58 | 0,42 | 0,47 | 0,52 |
| After | 0,50 | 0,46 | 0,30 | 0,28 | 0,39 |
4-person room (about 39 m³, wall about 13 m²) – reverberation time, s
| Frequency | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz |
|---|---|---|---|---|---|
| Before | 0,63 | 0,59 | 0,51 | 0,49 | 0,46 |
| After | 0,61 | 0,46 | 0,33 | 0,30 | 0,24 |
What we achieved:
What we did not achieve, and why:
When a printed acoustic wall is the right choice: the room has an echo and is used for video calls; there is a smooth wall that can be covered completely; the interior matters – the wall carries an image, not panels.
An acoustic wall does not stop sound reaching the next room. That needs sound insulation of the partition and the door. More: Office acoustics and Open-plan office acoustics: which values to ask for.
Do you have a meeting room with an echo? Send the dimensions and a few photos to [email protected] or call 0883 400 061. We will tell you how much wall area you need.
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