Fosi Audio IM4

The reviewer was impressed with the Fosi Audio IM4 open-back in-ear monitors, praising their spacious soundstage, detailed mids and treble, and tight bass. They found the design and included accessories (nozzles, ear tips, case) to be good value at the early bird price of $80, though they noted bass may not satisfy bassheads and a quarter-inch adapter is missing. Overall, they see it as a unique and worthwhile product.

The reviewer highly recommends the Fosi Audio IM4 as an excellent value open-back IEM around $100, praising its comfortable fit, versatile tuning options via ear tips and nozzles, and engaging V-shaped sound with wide soundstage and good instrument separation. It excels for media consumption, gaming, and rock music, though it is not suited for professional monitoring due to coloration.

The reviewer praises the Fosi Audio IM4 as an impressive and versatile open-back IEM, highlighting its comfortable metal build, easy drivability, and excellent scaling with better sources. They note that the sound can be tailored via interchangeable nozzles and ear tips, with the brass nozzle offering a brighter, more neutral sound and the black nozzle providing a warmer, bassier response. The main drawbacks are poor ambient noise isolation due to the open-back design and a less precise spatial imaging, making it less suitable for gaming or movies.

The reviewer finds the Fosi Audio IM4 to be an impressive first IEM from the company, praising its lightweight build, comfortable design, and well-executed V-shaped tuning. They particularly appreciate the modular nozzle system, noting the brass filter significantly improves treble clarity, and recommend it as a strong option under $100 despite minor quibbles with the default tuning.

The reviewer finds the Fosi Audio IM4 to be a beautiful, warm-tilted U-shaped IEM with excellent female vocals and good male vocals, though bass is lean and sibilance can get spicy at high volumes. Overall, it's a highly recommended, easy-to-sell IEM that sounds similar to the Civa Q but with better aesthetics and comfort.

The reviewer finds the Fosi Audio IM4 to be a well-built and comfortable IEM with a solid accessory package for $100, but notes that its tuning is more upper-mid-forward than he prefers. He recommends using the black nozzles over the brass ones, as the latter can be fatiguing, and concludes that while it's a good set, it doesn't quite match his personal preferences compared to competitors like the Unicom or Defiant.