We recommend a reverberation time of maximum 1.5 seconds at frequencies between 500 – 4000 Hz. Every location in a hall should have good speech intelligibility. Be aware of the possibility of flutter echo between two parallel reflective walls. A space without furniture does not stabilise the sound field, so an acoustic ceiling is not enough. Install acoustic slabs to the upper parts of the walls. Acoustic products must endure ball strikes without falling and being damaged.
Install acoustic slabs along the entire ceiling surface and to at least one wall. Cover soft acoustic slabs with battening so that 15 % of the slab surface is visible. When using perforated wooden boards, the visible area is usually smaller than 15 %.
Recommended products: PARAFON Wall panel, PARAFON Slugger, PARAFON Extended Metal cassette, Paracem