First thing first, These are a loaner pair from OPPO.   DESIGN   One of the most comfortable pair of headphones I ever worn, but they have a bit too much clamping at first, but after awhile it fades away. OPPO defiantly went all out when it comes to their fist pair of headphones, with the drivers, material, and creating a headphones that looks like you made an investment into the future. The stock ,~3 meter, nylon covered, cable fells really thick and durable. I also did really appreciate that the ear cups will go completely flat, for maximum...

Build / Fit They are much smaller than I expected. The aluminum casing is nothing too special, it looks very clean, and simple. The wires above the split are very thin with a feel like they could break easily if you use then regularly on the go. But, below the split is a very nice cloth cable that leads into a 45 degree plug. The fit seemed very loose, even with the comply tips.   Sound Neutral with a very slight rise in a bass. For the price, even for the $99 MSRP, they are incredible. The detail and sound stage are as good or better than some...

Comfort and build These headphones are extremely comfortable, I have worn them for upwards of 8 hours, with out my ears hurting. The ear pads do collect a lot of "stuff" like lint and animal hair very easily. The HD558s are build very well, holding up to abuse I put them through. Even though they are made completely of plastic, it feels of top quality.   Sound I love the sound signature of these headphones. The Sub-bass is satisfying enough for most music, but if you are really into Hardstyle and other bass eccentric EDM genres, these will not...

I found that the headphones are fairly boring if you are a basshead, but with the an amp, they can really drive, but a bit muddy at high volumes.