From precocious babies to precocious senior citizens, there isn’t anyone who doesn’t need a pair of headphones these days. There are phones, tablets, laptops and more that need a set of earphones to reach their true potential....

When it comes to speakers, amps, headphones and the like, the range in options is so broad. From brands that pop up overnight, crowd-funded Bluetooth speakers, and audio principles that predate cassettes, buyers are faced with sifting...