The conclusion is that it is impossible to predict a priori the level of perceived relief from the occlusion effect that a patient may experience when a given vent diameter/length is installed. Each patient has an individual, personal level of tolerance/acceptance of the hollow voice sensation. Further, it appears experienced listeners exhibit greater tolerance of the occlusion effect than new. Although instrumentation and easily implemented techniques are available for measuring the properties (frequencies and SPL levels) of the occlusion effect,in the end, it is the patient who decides whether or not the occlusion effect is disturbing. Relief from the annoying own-voice percept is obtained by systematically decreasing the mass of the vent, but examining a set of objective measurements cannot tell us when the SPL levels are reduced enough, although measurements may be valuable for record keeping