A pair of noise-canceling headphones as stylish, well-made, and comfortable as Marshall’s new Monitor II Active Noise Canceling over-the-ear headphones couldn’t have come at a better time. With so many of us now working from home, A.N.C. headphones are a balm for our souls, allowing for much needed moments of solace and relief from the world outside. They’re so good, in fact, that we here at SPY just added them to our ongoing list of the best noise-canceling headphones. But what makes them pop?