Calculator

1.       Special Fantoni version http://www.4akustik.su/calculator_fantoni_rt60_eng.html (only Fantoni absorbers in data base)
2.       General version http://www.acoustic.ua/forms/Reverberation-RT60.html (more absorbers in data base)
4.       Sound absorption coefficients table http://www.acoustic.ua/st/web_absorption_data_eng.pdf