I am happy to report another nice headphone match for the iCAN. I just bought an open box, new pair of HD700s on Amazon for $530. They sound great with the iCAN, and once again the 3D and XBass really bring out the best in these headphones. I can also really enjoy the high setting of the XBass on these headphones when I am in the mood, as the bass is very tight and controlled, so the higher level of added boost does not muddy things up. And even though the HD700s are already known for their soundstage, detail and imaging, all of these qualities take on a higher level of realism with the 3D effect engaged. And as I have mentioned over and over again, it is so cool how I can adjust the sound with the flick of a switch if a song comes on that is too bright or has too much reverb. It truly is like having several different amps all hooked up and ready to go depending on my mood or the recording. For instance, often at night I prefer a warmer and softer edged sound, so I turn off the 3D or even go down to the traditional crossfeed effect which especially softens the edges and gives my brain a rest from the super detailed 3D effect.
One thing I will add though is I was pretty surprised by how well the $250 Sony MA900s keep up with the Sennheiser HD700s that currently list for over 3 times as much ($849). In combination with the iCAN, the Sony's sound is amazingly close to the HD700's sound. They are both such spacious and open headphones with unusually realistic soundstages and excellent instrument separation. And as I have been saying in this thread, the MA900s match up very well with the ICAN. If I had paid full price for the Sennheiser's I would probably send them back and just keep using the MA900s. But the Sennheiser's do bring a higher level of transparency and also a tighter, cleaner bass, so I will probably keep them....or maybe at least until I hear the Hifiman HE560s when they finally come out.