So I bought these hd 558's and I cant be happier, they rock and are a amazing headphone in all ways especially for the price!
Music like Frank sinatra and the ink spots sound awesome on these! The bass is absolutely perfect for this kind of music and the bass reminds me of a old console stereo with 12-15 inch drivers.
They are clear and precise as well, all vocal music sounds amazing but so does rock and dubstep/bass type music.
I would highly recommend these phones
You do NEED a high quality source! I want to build a tube pre-amp or something for these to make the sound even more warm.