The figure shows that the ceiling reduces the sound level and increases the rate at which the sound level decreases over distance. This also means that the distance required between work stations in order to achieve an acceptable level, i.e. a speech level that does not disturb or distract, will be shorter.
Jooniselt nähtub, et lagi langetab helitaset ja kasvatab kiirust, millega helitase kauguse suurenedes alaneb. Järelikult on väiksem ka see vastuvõetava taseme saavutamiseks vajalik töökohtadevaheline kaugus, mille korral kõne helitase ei sega ega juhi tähelepanu kõrvale.