Thanks for this precision mate, very interesting, personally i'm more than certain that it affect my DX90 negatively cause I just can't dig as deep in sound spectrum than before, but the power conversion feel weak, with Mango it take about 3-5 minutes so the player ''open up'' and have his real sound, it's subtle but real. Like if the circuit need to warm and stabilise. I really want to understand what you talk about, especially power conversion schematic (any link?). It's time to became less dumb about what's affect sound quality....Did the mod is very pricy? Can you tell what it's about?? I'm listening right now to DX90 with Portapro and it's very delightfull And for battery life, I think all 3 batteries I got (2 samsung and stock one) just can't give more than 6h at volume I listen music, it's not the dual boot mode, anyway, I try the 5.1 lurker version now and conclude RB is not for me (i'm don't like to have to use (the impressive) EQ, prefer using other iem).