Re-introduced in March 2009 with a slightly tweaked and improved driver, the SR225i is a high end headphone from Grado. With similar features as the SR125i, the SR225i increases air flow by 50% which is achieved through an improved rear metal screen and closer matched drivers. The result is an enlarged soundstage achieved from closer driver tolerances, while the improved rear screen frees the headphone from colorations. The SR225i is a popular middle-of-the-line option between the lower end SR60i/SR80i and the higher end RS2i/RS1i.