Binary EP321 MEMS vs Kiwi Ears Halcyon

The Kiwi Ears Halcyon is the more complete package: a five-driver tribrid with a 10 mm dynamic driver, three balanced armatures and a MEMS tweeter, plus six swappable nozzle filters and an aluminum shell. The Binary EP321 MEMS is a single MEMS driver in a resin-and-wood shell, tuned bright and wide, and owners say the shells feel a bit hollow. Buy the Binary if you want maximum treble air and a wide stage in a simple wired set; buy the Halcyon if you want adjustable tuning, real bass, and sturdier build.

• Choose the Binary EP321 MEMS if you want a lean, bright, wide-sounding wired IEM and you mostly listen to acoustic, vocal and detail-heavy music at moderate volume.
• Choose the Kiwi Ears Halcyon if you want one set that covers pop, classical and gaming, with adjustable filters, a sub-bass shelf and a metal shell.