Summary: I owned Sennheiser HD580 for years, this year decided to upgrade and listened to HD600, HD650, Grado RS2 and Grado RS1. As result purchased Grado RS1 as it had best sound, clarity, details, sound stage, instrument seperation and realism of music you are listing to.
Summary: I thought I had heard the best headphones when I recieved my Sennheiser HD650. (I listen trough a Musical Fidelity X-CAN V3 headphone amp and an average Denon cd player). But then I received these Grado RS-1 headphones. I noticed that it has better detail and better bass.
Summary: It is probably the best headphone ever developed. It cost 1/5 the price of a Stax Omega 7 and can stand toe to toe with it all day long in sound quality. The first time I put on a set of Stax Omega 7, I thought mankind had finally achieved the epitome in headphone development.
Summary: Note the price is UK £375. OK at last I have the RS1's I read all the reviews first about how these headphones compare to the HD600. I am an amateur piano player and the rest of the flamily play instruments (intermediate or good) bass player cousin who has played with Ronny Jordan and co, drummer...
Summary: I got these cans used from a fellow member at http://www.head-fi.org for $430 dollars. The right Mahogany ear cup suddenly developed a hairline fracture and I sent them back to Grado Labs in Brooklyn, NY for repair; it cost me $75 dollars which totals $505 dollars.
Summary: I was able to compare Senns 600 vs RS-1 side-by-side on a great deal of my CD collection using the Cary 300SEI amp headphone output driven by a Cary 303-100 CD player. Ultimately sent the Senns back.
Summary: I purchased these wonderful headphones from http://www.ozenterprises.net who accepted a trade-in to help lessen my cash outlay. The RS-1 lists for around $1200 in Canada. The signature Grado sound of the less expensive models is presented in a more refined manner.