Excerpt: For closed back headphones the AKG K551 is surprisingly open and airy. The precision and clarity on the K551 is through the roof. The AKG K551 sticks to its reference monitoring legacy to the tee. However, if you want your 20 to 150 KHz space bumped up, these are not the cans for you.
Summary: I’m proud to announce I now have a new go-to pair of headphones (for this week anyway…). For someone who doesn’t mind big headphones, I feel these AKG K551s are just about as good as headphones get. With their lightweight and thin profile, they don’t feel nearly so big.
Pros: Great design, Good seal, Comfortable, Light, ControlTalk + Mic, Phenomenal sound stage and audio quality, Durable, Clear right and left ear cup indicators.
Cons: Cable is not removable, break in period, and headphone plug will be incompatible with most iOS cases. Expensive. No travel case. Low on bass and size of ear cups may not be suitable for all.