JVC HARX900 High-Grade Full-Size Headphone,Black

I do not know how these would be for an mp3 or unpowered computer. I use these with my computer hooked up through my stereo. It takes awhile for them to get broken in but they get better and better. I got the 2yr warranty because people say they have had problems with them. I handle mine with care hope they last a long time. They are not exact sound replication type headphones but they are like old school headphones that are upgraded and well balanced through all the tone range(not bass heavy but there is plenty there if you want). I think they are awesome so much so that I don't have loudness button on or bass and treble just straight sound reproduction. I can't turn them up enough to get distorted before they hurt my ears. I am not sure you can. Very comfortable by the way.

I went around for about 2 weeks looking for a good pair of headphones. Let me tell you many of these headphones out on the market especially the top of the line "Beats" have very good sound, However what I was looking for was a headphones with quality sound yet one which I could where for a very long time. Most headphones start pinching your head after about 1 hour especially the "Beats". I would take these headphones over the most expensive "Beats". I hooked up an equalizer and I was surprised how I could precisely tailor the Mids , High and Bass. I like these so much that I added the Walmart Warranty. The best thing to do is to go out to stores and bring your own music and try out all the different model head phone. WOW! for me these are the best headphones I have compared to my $400 Beats. Yea! WoW! AAAAAAAA++++++