+ Organic, analog tonality
Then, there’s its analog tonality. I’ve really only heard two other IEMs that exhibit a similar tone: the Sony EX1000 and the Periodic Be. Both these IEMs, along with the FD5, evoke an unvarnished—though by no means unrefined—vinyl-esque quality. The BLON BL-03 sort of shares this quality too, but not quite as closely. The AK T8iE MKII, despite being a single DD unit, is farther behind still in this regard.
I can't agree more!.
After I EQ the v shape out of them this was apparent, there is a sense of ease yet inviting sound to them... very charming.