I was listening to Rezound over and over in order to solve a static noise issue earlier (please see other thread about that issue). Now I want to post something about its general audio quality. I saw people saying Beat Audio/iBeat (alright, or iCrap) is for rap only, or Beat Audio only makes audio louder, or only amplifies bass sounds. Not true imo. Based on my testing, with beat mode on and off, with beat earphone or my other earphone (ultimate ears 700) (I used to have an er-4p, but I gave it to my record engineer friend when he broke his with a deadline to catch), my opinion is, Beat Audio does its job to minimize distortion across the spectrum. The difference between Beat mode enabled or disabled is significant. And the difference between iBeat earphones and my ultimate ears 700 is not. (iBeat has its advantage in that, the audio output of Rezound is tuned based on this setting Beat Audio + iBeat) In one line, Beat Audio mode in Rezound gives more detail of music, period. Is it good enough to live up to the hype? I don't know. Maybe not yet, as least not until HTC releases Beat API so all apps can take advantage of Beat Audio. But, is it better than other non beat phone for now? Of course it is. (my previous phone is Nexus One).