BaddogI'd auditioned this, O2 and the RX MKIII B+ at a store, using my UE900 & Phonak PFE 232. My source was DX90, line out. The RX MKIII was the best sounding, controlled bass and detailed treble, realistic soundstage. The RX sounded more entry level, muffled compared to my DAP headphones out.
NihaoThat is what i worried when they released the new RX as my focus are more on headphones - Audio Technica's AD900/AD2000X using either my sound blaster core3D for the AD900 and Centrance DACPort LX For the AD2000X instead of IEMs.
I have auditioned the RX MK3 B (not B+, some say they are the same and just battery improvement while some including ALO themselves mentioned sound improvements as well) and i absolutely love the bass/soundstage.
As this does not have bass boost/controls, i am worried that it might not provide sufficient amplification to my AT open cans that are typically low/lacking in bass. (or at least i personally find it lacking)
Really hoping the next drop to go lower on the pricing but at this point i think i might as well continue my hunt for the RX MK3 B+ used :(