How does a company that's already beating Bose in the active noise-cancelling headphone department find a way to up the ante? We're about to find out with the new ATH-ANC9 QuietPoint Active Noise-Cancelling Headphones ($300). Audio-Technica's new top-of-the-line model boasts what it calls Tri-Level Cancellation -- three preset noise reduction modes separately optimized for airplane (95% cancellation), office (95%) and study (85%) -- as well as 40mm…
