I have not compared the two, but I do own the Shure 1540. I would not classify it as a basshead can, but it is bass present but well controlled. It has been compared as being a HD650, but closed back. As far as the compared to the X1 I would say they are very similar overall, but the X1 would have a little bit more of an airy feel do to the open back design. I will say this though the 1540 does an excellent job at having an open feel, despite being closed. I was very surprised by this. I think ultimately what it should come down to what suites you best, an open or closed back headphone. I hope this kinda helps, it is a shame I could not offer an exact comparison.