Audio-Technica has been quiet on the noise-cancelling headphones front for some time, but today it announced a new set of sound-nixing cans, the ATH-ANC9. While earlier ATH models block out 85 percent of outside noise, the new version ups the ante to 95 percent. Also new are three Tri-Level Cancellation modes, each tailored to drowning out sound in a particular environment (airplanes, noisy office and libraries, for example). This over-the-ear set has 40mm drivers and an input sensitivity of 100 dB to make the mu
