There are quite a few things that can make home theaters crappy, and one of them is the fact that the vast majority of people are working with just  a soundbar . Don’t get me wrong, soundbars are great for hoisting your audio experience off the floor and making it serviceable, but they’re still only part of the home theater equation. To make a true home theater setup, you want to add surround sound channels—typically two smaller speakers to the sides that bolster ambient sound, adding a sense of space—so that audio is coming from multiple angles, not just blasting at your face. And don’t forget low-end. To get real bass, you need a subwoofer, which is big enough to move lots of air. At the end of all that, you’re looking at a multi-speaker setup that can cost quite a bit of money, especially if you want something outside the budget range. But what if there was one  audio gadget that could get you most of the way there?…