Recs.
Updated
The reference quality sound of the MDR 7506 makes them great for studio use or if you like sound that is on the more accurate side. The compact, closed back design and light weight make these great for portable use too.
SpecsUpdate
Pros
Pro Clean and balanced sound with smooth bass and detailed highs
The bass is just right. It may not have the deep sub-bass extension that bass heads crave, but what is there is fast, tight, and punchy. The mids are clear with a hint of warmth, which makes vocals and guitars sound very clear and you can easily hear their sonic nuances.
The reproduction of highs is the part that these headphones really shine. They are crystal clear and highly detailed without adding hiss or harshness to the overall sound. Cymbal crashes and pings, for example, are very close to what you would hear if they were played right in front of you.