In open lobbies, conversation confidentiality is a serious concern. The Speech Transmission Index (STI) in a typical lobby is 0.6–0.7, meaning words are audible even 5 metres away. Acoustic privacy zones combine sound-absorbing materials, masking noise and architectural zoning to reduce STI to 0.2–0.3 — a level at which conversation content is indistinguishable to bystanders.
Three Levels of Acoustic Privacy
Level one — sound-absorbing finishes: ceiling panels NRC 0.85+ and carpet with 8 mm underlay reduce overall reverberation to RT60 ≤ 0.6 s. A baseline solution from $35/m². Level two — sound masking: white or pink noise generators (42–48 dB) uniformly dissolve the speech signal. Masking system for 100 m²: from $1,800.
Level three — architectural zoning: soft partitions 1,600–2,000 mm tall in 50 mm acoustic felt (NRC 0.80) and glass screens with acoustic laminate (Rw 38 dB). Combining all three levels provides full speech confidentiality at 1.5 m from the conversation zone.
Solutions for Different Venue Types
For business centres: privacy zones at the reception desk (conversations with the administrator) and in waiting areas (phone calls). Minimum package: 2 zones of 4 m² each. For medical clinics: the registration zone where patients share personal data requires STI ≤ 0.25 per HIPAA standards.
For banks and law firms: a negotiation zone in the lobby with sound insulation index Rw ≥ 45 dB. The solution includes acoustic booths of 10 mm tempered glass with magnetic seals and forced ventilation. Booth size: from 1.5×1.5 m. Lead time: 3–5 weeks.
Cost and Return on Investment
Basic package (levels 1 + 2) for an 80 m² lobby: from $3,500. Full package (all three levels) with acoustic booths: from $6,500. Installation: 3–5 working days. ROI for a law firm: preventing a single confidential data breach covers the system cost.
Reception Space performs acoustic modelling of the lobby before design: background noise measurement, RT60 and STI calculation, selection of optimal material and system combinations. Audit cost: from $450. The result is a technical specification with guaranteed parameters.