118 hole 120 and ports 122 and 124 have acoustic properties that may affect the performance of the earphone 100 these properties may be adjusted to achieve a desired frequency response for the earphone additional elements such as active or passive equalization circuitry may also be used to adjust the frequency response the effects of the cavities 112 and 114 and the ports 122 and 124 are shown by graph 400 in fig4 a the frequency response of a traditional earbud headphone that is one that does not extend into the ear canal and does not provide a seal to the ear canal is shown as curve 404 in fig4 a traditional ear bud designs have less low frequency response than may be desired as shown by section 404 a which shows decreased response below around 200 hz to increase low frequency response and sensitivity a structure 126 sometimes referred to as a nozzle may extend the front cavity 112 into the ear canal facilitating the formation of a seal between the cushion 106 and the ear canal sealing the front cavity 114 to the ear canal decreases the low frequency cutoff as does enclosing the rear of transducer 116 with small cavity 112 including the ports 122 and 124 together with a lower portion 110 of the cushion the nozzle 126 provides better seal to the ear canal than earphones that merely rest in.