By the way Fiio X5 is confirmed of having 7 op amps!, four OPA1612 as Amp and LPF, two LMH6643 as Buffers, and one other, and 12v of voltage swing. I personally really like these choices and am certain to purchase it now. Get ready, I can tell you the X5 is going to have a very enjoyable sound, these op amps coupled with the PCM1792 DAC will be very detailed, balanced, smooth yet energetic (hard to conceive, yes) and I have a feeling there will be some who prefer the X5 to even the hm901 and dx100. I'm pretty excited about it. Have to wait till march though