Cayin YB04 IEM

In earphones, every frequency counts. Accounting for all of them, the YB04 IEM from audio newcomer Cayin is designed to get the most out of any sound—no matter where it falls on the frequency spectrum. Each earphone features four balanced armatures: two Knowles drivers, which act as tweeters, and two Sonion drivers, which act as woofers. For listeners who want more of a specific frequency, the YB04 also comes with 10 interchangeable eartips, including pairs to accentuate vocals, bulk up bass, and achieve a balanced sound signature. Rounding out the design, an aviation-grade aluminum shell maximizes durability while reducing resonance between drivers. It's a total package where the "build quality and comfort are top-notch" and the "sound is very good," says Headfonia founder Lieven.