Usually, planar magnetic headphones aren't the most portable cans. At this year's CES, Audeze unveiled its much more portable Sine planar magnetic on-ear headphones. What does that mean exactly? Well, the planar magnetic tech uses a thin diaphragm rather than typical headphone drivers, touting higher accuracy and more detailed sound. These particular cans are also lightweight and don't pinch in on your head, which sometimes can be a struggle, especially with the extra heft you have when dealing with audiophile-grade headphones.