Audio-Technica QuietPoint Active Noise-Cancelling HeadphonesAudio Technicas ATH ANC9 QuietPoint on ear headphones use proprietary active noise cancelling technology to provide a comfortable listening environment in areas with high ambient noise. Delivering noise cancellation up to a remarkable 95%, the ATH ANC9 QuietPoint headphones feature Audio Technicas new Tri Level Cancellation. Mode 1, ideal for use on airplanes, trains and buses, applies maximum noise cancellation to low frequencies. Mode 2, designed