The acoustic performance of stud-framed lightweight partition walls is strongly affected by the presence or absence of sound-absorbing materials in the cavity. Fibreglass, a commonly used cavity absorbent, has come under criticism over potential adverse health effects owing to its fibrous nature. This paper investigates some low cost alternatives that might be used for providing cavity absorption in such walls and yet offer sound insulation similar to that achieved by using fibreglass. A minimum improvement in the STC rating of 4 points was observed by using different cavity absorbents, with some options offering STC ratings similar to those achieved with conventional fibreglass. The effect of adding an extra layer of plasterboard with a corresponding equivalent reduction in the stud width was also studied.