Hello I purchased the Astell & Kern AK120. I've several IEMs, old and new (E3c Shure, Etymotic ER-6i, Ultimate Ears Super.Fi 5 Pro, Philips Fidelio S2) and I also have the Grado SR80 and AKG K701. But I would like a new IEM that I can do to better appreciate the quality of the player. I am...