It was just a few weeks ago that I reviewed the Dali IO-6, a pair of noise-canceling headphones that easily landed among my favorite cans on the market. Despite a hefty $499 price tag, their Danish design, great sound, and seemingly never-ending battery life made me feel they were worth the investment. But not everyone needs active noise-canceling (ANC) circuitry. For some people, a headphone that just blocks out a decent amount of sound through physical characteristics is enough. If that sounds like you, Dali’s IO-4 is the better option, with a more palatable $399 price tag, and somehow even…

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