Knops are adjustable ear plugs that might save your hearing

Ask anyone who frequents loud concerts, and you’ll probably learn why protecting your hearing is important. Knops are a new pair of adjustable ear plugs looking for funding on Kickstarter that claims to be “the volume button for your ears” to help you do just that.To clarify — unlike, say, the Here One wireless earbuds — the Knops aren’t some kind of high tech audio filter. Instead, they’re a pair of analog acoustic filters (i.e., earplugs), albeit ones