Do you think the RE-400s would be more suitable over the EPH-100s for the music I listen to? Mostly classical, piano, acoustic, symphonies, vocals, and some occasional rock splashed in there?
The soundstage was perceivably larger with the EPH-100 mainly due to the presentation having more bass emphasis and thus a slightly more recessed midrange when compared directly to the RE-400, but realistically they are on par I'd say, a bit above average in size. While I don't listen to much classical (I just have a few select baroque pieces), I think the imaging/separation is a bit better on the RE-400 and it will feel a bit less congested, so better suited for classical. I do have a good bit of modern piano, acoustic and vocal tracks and I feel the RE-400 is definitely better suited to those - they have a special way with vocals particularly (more upper mids presence perhaps, transparency in mids), enough to warrant me having a pair on hand still.