really liking the fir m5...while i find some similarities between the a18 and elysium, the m5 sounds much different than the other two.
here's how i hear it between the 3:
a18 - ultimate neutrality, flat-frequency response, reference sound with amazing detail and separation
elysium - laid back, mid-humped, very detailed, incredible overall mids and vocals (wow, the vocals)
m5 - super high energy, V-shaped sound sig with emphasized bass and lots of treble energy...definitely colored signature, but a lot of fun and very musical.
@aaf evo mentioned to me he thought these sound like the fourte in some ways. i didn't hear it at first, but after listening for a little while i did get a similar euphonic and colored experience; again, there is definitely coloration, however, it's not as incoherent as the fourte, nor as accurate and realistic sounding as the a18...it just sounded really nice.
these 3 would make an uber nice totl trio, indeed.
2 ears up for the m5!