Room acoustics has as the key parameter, the absorption coefficient. Traditionally this parameter is obtained by measurement of the reverberation time (RT), which can be long and laborious. This paper avoids a frontal attack on the protracted RT measurement. by measuring the decay of sound from a point source in an enclosed area of known geometry. A family of curves representing the absorption over the entire range of coefficients is used to match the decay of sound already measured. The matching absorption coefficient will then correspond to the absorption of the room. The efficacy of the method is endorsed by the results of two separate investigations.. The entire investigation was carried out in a well acoustically investigated main hall at The Institute Technology Tun Hussein Onn (ITTHO) where the RT has shown a convincing repeatability over some twelve separate investigations.