I have a LOT of Grados, and have gotten to the point where I use the deluxe pads on every one in the RS and GH series, the PS500s, the 325x, and even the new HP100 SE. The difference between them and the regular flats is never negligible, and often extraordinary, with greater definition all around and a lot of help in the mids. I find them more comfortable, as well. I didn't like spending 50 bucks
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