A high-end IEM for music enjoyment and monitoring alike, the Sony IER-M9 is built with the company’s proprietary Penta five-driver system, which includes a magnesium-diaphragm super tweeter and optimized signal paths. The T-shaped balanced armature directly drives the diaphragm for a more linear motion and clean, faithful highs. Of course, the IEM has an upscale look to match, with a light, durable magnesium alloy housing and a carbon fiber plate. Designed to stay firmly in place with a snug fit for all ear sizes, it comes with a variety of ear tips, a carrying case, and other accessories.