Every ear has a unique sonic signature. Some ears are more musical than others. Ears that have a bell shaped cavity are said to be "tubed" whereas narrow cavities are of a solid state nature. Ears that stick out are described as dipolar, whereas flat ears are referred to as boxed. Ears with short lobes are prone to low frequency roll-off, but ears with long lobes sometimes encounter a ground loop hum. Dirty ears can only hear in mono; the cleanest ears can hear surround sound. If you have perfect hearing than your ears are said to be vinyl and golden; if you use a hearing aid then your ears have been digitized and you will forever changing cables and power cords. Finally, asymmetrical ears can reverse polarity.