Just so i understand this. The HiFi mode is just a gain setting, right? As in, it doesn't affect sound quality, only volume, right? Because if that's the case the phone is actually loud enough for both by Shure 215 and my Sennheiser HD 600 as it is. Curiously, the Shure 215 activated the gain right away, but maybe it was because i had plugged the Sennheiser first. I'll have to test this.
Right now i'm contemplating whether to root or not. I think i'll keep it without root for a while, if anything not to void the warranty right away. Now i know you need AlsaMixer to raise the gain, but how do you increase the steps in the volume?
Also, i noticed some here recommending Poweramp to play the music. I just downloaded the demo version. Is it really worth the four bucks? So far it looks good enough. I like that you can browse though the file system, but the folders and font are too big, and i can't seem to find a way to make everything smaller. I'm used to Total Commander but that has its own internal audio app. On my PC i just browse to the right folder, right-click on it and play everything that's inside with Winamp (yes, i still use this, version 2,91, no less. Haha). I have been dreaming of using the same method on a portable device since forever.
At any rate, so far i must say i'm pleased with the phone. The audio is good. Can't say whether it is better than an X5 since i never had one but i think it is better than the X3. It seems to have more presence. The music is more forward and that across the board (in the X3, certain things seemed to be in the front while others remained in the back, which i found annoying). I'm not an expert on this stuff so sorry if i can't provide a detailed explanation, and i can only offer my own subjective impression. All i can say is that this player is really, really balanced.