If you’re looking for a discount on a great pair of active noise-canceling headphones for your summer adventures (even if they’re indoors), you’re in luck. The Sonos Ace headphones in black are currently on sale for $279 (usually $399) at a variety of retailers, including Amazon, Best Buy, Walmart, and directly from Sonos. Weirdly, the white version is discounted at all. The Ace are as comfortable as they are attractive, with an expansive soundstage and balanced sound profile that’s less bass-fo