Our SR Series Custom IEMs use the trusted Knowles SR single balanced-armature driver, tuned for bigger bass, cleaner mids, and brighter, more detailed highs than other single-driver sets on the market. They’re the perfect entry point into custom in-ears, giving you pro-level clarity and comfort without the multi-driver price tag. Each pair is built to your ears, finished with a high-quality braided cable and packed in a premium protective case — a simple, reliable, and seriously good-sounding upgrade for any musician or audiophile.