Tivoli Audio is known for radios that rarely deviate from a tried-and-true formula (save for that snazzy crystal-encrusted Model One), but the company is still capable of surprises. Exhibit A: it's gearing up to release its first pair of headphones. The new Radio Silenz noise-cancelling cans have 40mm drivers in the wooden ear cups, and a "Defeat" button mutes your tunes so you can hear someone talking to you without taking the headphones off. Tivoli says the AAA battery will give you 50 hours of listening. The Radio Silenz w
