Sina Salehian/Getty Images By now, most people are familiar with HDMI (High-Definition Multimedia Interface), the connector that lets you plug a single cable from your Nintendo Switch, Roku, Amazon Fire Stick and various other boxes to your TV to display whatever you want. TVs offer more than just one type of HDMI port, however, and many specifically include HDMI ARC and HDMI eARC, versions of the interface that support soundbars for higher-quality audio. The distinction between various flavors of HDMI can get a bit technical, but if you can understand the difference, it's possible to unlock improvements like more immersive audio from Dolby Atmos just by plugging in the right cable into the right port. What is HDMI ARC? HDMI ARC or HDMI Audio Return Channel was introduced into the HDMI specification (in this case HDMI 1.4 ) in 2009 with a specific purpose: simplifying and improving the experience of getting audio from your TV to a speaker.…