Congratulations, anom, on the SR225's. They sound AMAZING unamped from modest sources. You can take an INexpensive next step in sound quality from your phones. Quite a few folks have noticed the sonic differences in Grados by changing the foam pads. With your SR225's came the bowl (donut) shaped pads, which are generally noticed to enhance the highs, diminish the lows, and increase the size of the soundstage. Another pad which is highly regarded by a pretty good number of Grado owners is the modified Sennheiser 414 pad. These enhance the bass, give the highs less emphasis and give a smaller soundstage, but enhance the intimacy and clarity of the sound very nicely. A set of HD414 pads can be purchased from Sennheiser for about $8 US (shipped). The modification is to cut a round hole in the center of the pad so as to expose the entire driver area. It's a pretty cheap experiment, and, for such a modest amount, CAN provide a substantial improvement in the sound of your SR225's. I emphasize CAN because quite a few Grado owners prefer the bowls to the modified Senns. I mention the modified Senn pads because I am one of the Grado owners who greatly prefers the sound of my SR225's with the modified Senn pads. I wonder on which side of the bowls/modded Senns choice YOUR ears will fall?
Just in case you are interested in a set of Sennheiser HD414 pads, they can be found here:
http://shop.sennheiserusa.com/retail...ct_prod=019545