These pads are a big upgrade for other Grado models
I used these G-CUSH circumaural ear pads on a pair of Grado SR-325 headphones. The improvement was a substantial upgrade in performance as well as making the headphones much more comfortable. There is more of a spatial spread in the soundstage and the bass is more balanced. The midrange and highs are relatively unaltered -- which means it wont make the already mellow sounding RS models too mellow sounding.