The IEM market has exploded in the last five years, particularly from Chinese manufacturers operating at unprecedented price/performance ratios. The result is genuinely world-class sound available for under $50, and a confusing landscape of acronyms, driver configurations, and competing tuning philosophies.

Start here: budget ($20–$50) — Moondrop Chu 2 or 7Hz Salnotes Zero. Mid-range ($100–$300) — Moondrop Aria 2, Truthear Hexa, or CrinEar Daybreak. Higher-end ($300–$500) — Symphonium Crimson or Letshuoer S15.