The Reference Series is the top-notch range of headphones from Grado, of which the RS2s are the second most expensive.  In this category you’re competing with the likes of Stax and the top Sennheiser, both of whom have electrostatic designs.  The Grado’s however aren’t electrostatic, but open backed design.  The fish, as befits the price, is very fine, with use of real wood - and they weigh very little.  Consequently you can hardly feel them on your head, such is their apparent lightness.  Despite this lightness they are by no means fragile, having a controlled and stable fit.  Sound wise the Grados were superb.  Midrange and treble detail was awesome, but their response was also smooth and highly sophisticated.  There was a wonderful sense of airiness and transparency. Big orchestral pieces had both scale and presence, plus timbre richness, which is rarely found.  These are a true high-fidelity product so don’t expect synthetic or forced low bass response.  It’s only there when it’s on the recording, but if it’s low and powerful, the RS2s will play it with speed and depth.  Highly recommended if your listening is mainly through cans, where the heavy cash outlay will be justified.  A good (preferable the RA1) headphone amp will make them really sing, so it’s virtually a must do.