Apologies I overlooked this post.
Well the SQ of the output is very good. The only lossless audio file supported is the .wma but I did not bother transferring/downloading any. I own a pair of Brainwavz Pro Alpha IEMs - not exactly high tech or high-end but decent entry level IEMs and good bass output provided there’s a good seal around the ear canal. This phone did a fine job with the 320 kbps soundtracks and those that were downloaded off Nokia Music Store. I’d say better than the iPh 3G. Connected the 920 to my new pair of Arko 6C bookshelves and it did a fine job. Hope this helps!
Edit: Nokia Lumia 920 sound quality?