I heard the 1540 similar to the graph, a little missing in the low bass, mid bass hump, a bit U shaped and a rough treble. I think the 1540's curve is the most most ideal for a closed headphone.
I'd actually buy the 1540 again if I came across a good deal.
The 1540 treble is really not "rough" though, its just less smooth than the HD650 (on the NAD D1050), I have heard many (majority) headphones that are more "rough" than the 1540, beyerdynamic 990, HIFIMAN HE400 sibilant and rough treble, Denon D2000 is too bright and sibilant, anyway yes they also have 2 sets of ear pads, 2 cables and a carry case, so that is pretty good, although they would probably be more successful if they did not include all those accessories but were placed nearer to the HD650. I have not heard the X2 but I prefer the 1540 to the X1 no contest, except for competitive gaming like CS:GO the X1 were very good for that, but for music the 1540.
Last edited: