Polk Audio jumps into the wireless-headphone market

Las Vegas —Polk Audio is best known for building loudspeakers, but they’ve also designed some pretty good value-priced headphones in the past few years. Now the company is taking the next logical step and introducing wireless headphones. Polk’s Hinge Wireless headphones are a wireless version of the wired Hinge headphones Polk introduced in late 2013. They’re named