The behaviour of a gas cavity impulsively collapsed by a liquid liner is investigated using a unique experimental facility as well as a commercial computational fluid dynamics (CFD) code. This study discusses the effects of the acoustic pulse generated by a quick turnaround on the dynamics of the liquid cavity. In the first part of this work, the equation of motion of the liquid cavity is derived with the assumption of an incompressible fluid. Both experimental and CFD results are found to be in good agreement with the model for a slow collapse driven by low pressure. The second part of this work focuses on a more impulsive cavity collapse, where it is found that compressibility effects impact the behaviour of the cavity. In this regime, the cavity undergoes a secondary collapse of smaller magnitude that the incompressible model is unable to predict. It is found that the pressure pulse generated from turnaround is responsible for the secondary collapse observed both in the experiment and the CFD simulation. Additionally, pressure and video data from the experiment suggest that the pressure pulse generated by the quick turnaround eventually reflects as a rarefaction wave from the liquid-gas interface, leading to a visible burst of cavitation bubbles.