Effects of inserting the probe tube through various sized vents, as well as under the earmold, during real-ear probe mic testing were examined in this study by Stephen Painton, PhD, and Taylor Sweeney. Results seem to support the practice of inserting the probe tube through the vents of earmolds for a “truer” low-frequency measure. This seemed to be the case regardless of the diameter of the vent. All conditions with the probe tube under the earmold seemed to show a “slit leak” effect on the low-frequency output measures that was larger than any effect shown by the probe tube being placed through the vent.