2 ccAbnormal Ear Canal Volume (large)No Mobility No Middle-ear PressureTM perforation or patent ventilation tubeB (with small ear canal volume)ECV < 1 ccSmall Ear Canal Volume No Mobility No Middle-ear PressureWax/debris or faulty probe(pushed against the side of the ear canal)cNormal Ear Canal Volume, Restricted Mobility (low amplitude)Negative(sub-atmospheric) middle ear pressure Peak compliance < 0 negative peak outside normal rangeEustachian tube dysfunctionD (notching)Shows dip in the peak Sharp double peak like "W"Atrophic Scarred drum or hypermobile TME Ossicular chain discontinuity">