Yes, agree. ZX2 indeed has the richness and stronger bass than ZX300 if both compared with SE. But I found the richness of SQ from 4.4mm socket of ZX300 is stronger than ZX2, so always as being said the 4.4 balanced feature is the "main dish" of ZX300, the SE is just a "bundle gift". I audition it with N3AP, and found ZX300 wins in lots of area: treble extension, details of timbre, soundstage (a bit wider and cubic), etc.. if comes to bass, the attack is still a little bit weaker than ZX2 but almost on par. The 4.4 balanced socket only has 3-4 hours burn-in, so still uncertain if there will be anymore changes before the 200 hours mark.