Shure Inc. has released the E4c, the newest model in its E Series line of sound-canceling earphones. Selling for US$299, the earphones were designed to be similar to the iconic white earbuds Apple includes with its iPods. They feature high-definition drivers with tuned-port technology, for more responsive bass, and they add triple flange sleeves to the sets of sleeves already included with the E series earphones; the variety of sleeves helps ensure the right fit in the listeneris ears.