Active noise cancellation's the secret sauce that keeps us counting sheep even when surrounded by the cacophony of crying babies and the dull roar of jet engines -- though we often find the bulky form factor of those serenity-inducing cans unwieldy. Luckily for us, Pioneer has released its SE-NC31C-K noise-cancellation earbuds that promise to remove 90 percent of ambient noise at the flip of a switch on its AAA battery-powered in-line module -- all for around a hundred bucks, which is a far more palatable price than its sound-suppressing brethren from Sennheiser ($320) and
