I did a lot of research before i bought these zx600 and was a bit worried while waiting for them to come ,i should not of worried Straight out of the box and plugged in instant peace of mind Bass Yes ,Treble cool mid range all there .I have a pair i payed a lot more for no difference to my zx600,buy ,get great sound

These headphones are certainly the best I have ever tried. The sound quality is excellent, and they are comfortable to wear, even for extended periods (4 hours)

My previous headphones were Sennheiser (can't remember the model). The quality from them was excellent but at a price - to get the best quality from my iPod I had to either convert or download everything lossless. Needless to say my iPod soon filled up. When my Sennheisers gave up I decided to go Sony and started reading the reviews. The ZX600 seemed ideal, good quality and at half the price of my Sennheisers. The first thing I noticed is that they are much louder. I compared mp3 quality to lossless quality and found very little difference so reconverted all my tracks back to mp3 and reloaded all my CDs to my iPod that I previously had to remove as I had run out of room. The sound quality is not quite as good as my Sennheisers but still more than acceptable. Could do with a bit more bass but the treble is crisp and clear. The sound can sometimes sound a bit harsh if TOO loud but turn it down just a bit and the sound is good. Leakage from these headphones is pretty minimal - they have to be really loud before someone on the bus can hear what you're listening to. One criticism is that they move a bit easy when I'm gardening - they keep falling off. Otherwise, I am perfectly happy with these headphones.