Abnormally negative middle ear pressure with normal compliance is a Type ____________ tympanogram.

A Type C tympanogram is characterized by abnormally negative middle ear pressure while maintaining normal compliance. This condition indicates that there is a negative pressure present in the middle ear, which can often be caused by Eustachian tube dysfunction or other factors affecting the equalization of pressure within the ear. The normal compliance means that the tympanic membrane is moving properly in reaction to sound, indicating that the mobility of the eardrum is not impaired.

In contrast, a Type A tympanogram reflects normal middle ear pressure and compliance, while a Type B tympanogram denotes a flat response, usually indicating fluid in the middle ear or other restrictions affecting eardrum movement. Type As, on the other hand, suggests reduced compliance with normal pressure, often found in cases of ear canal blockage or otosclerosis. Thus, in the context of these definitions, the identification of a Type C tympanogram as one with negative pressure aligns perfectly with the description provided in the question.