Unfortunatley my device known sound problem: strong noise when the headphone jack is activated. This falls at high volumes or noisy environments not to, but once you hear music in low volume, the noise is no longer to hear and interferes with any musical enjoyment. This is especially noticeable in radio plays, or audiobooks! I have tried several earphones (Sennheiser, Apple apple earbuds), with all the same issue!)
I then got the device from HTC fully swapped (with detailed problem description!), Because I found very appealing the smartphone itself. Unfortunately, the replacement had the same problem. Unfortunately Another exchange was not possible at my local dealer because the noise in the store (noisy environment, ventilation) for employees with the accompanying cost of headphones was incomprehensible. Device delivered: The upshot. Total faint idea of HTC!
Conclusion: If you do not use his smartphone for listening to music can confidently access here and get a very good device. All other rather look around for an alternative! A proclaimed by HTC "spectacular and authentic sound experience" and "the uncompromised sound in studio quality" is, in my view, unfortunately, only a bad joke! HTC pity that you should actually better!