Summary: Comparison Review: ATH-A9X, ATH-A900X, AKG K550
I have decided to update this review, not only because I've spent some more time with both the K550 and the A900X, but because I found frequency response measurements for both of them on Golden Ears.
Pros: Linear, smooth bass with great extension. Manages to sound fairly neutral while still maintaining good musicality.
Cons: Multiple issues in treble region. Mids are thin and lack body or presence.
Summary: When I purchased my AKG K550, I was in the market for a closed-back headphone that gave me the best open-back sound while containing the noise so I could use them in a dorm room. The AKG K550 does that and much more.
Pros: Balanced response, Versatile, Closed-back with an open sound, Build quality
Cons: Lack-luster with classical, ears touch drivers, take a while to break in, lose some personality with time
Summary: This headphone has a great neutral sound but I can see many people finding the bass a bit too lean yet not light. This can be due to poor seal which as mentioned earlier is a bit tough to get for some. I personally did find the bass very good however there are times where I feel it’s a bit lacking.
Pros: Looks sturdy, bass is tight and midrange is lovely
Cons: Hard to get a good seal. A bit-lean sounding. Treble is a bit odd but still good
Summary: Along with the summary below, I have posted a Youtube video review of the K550. If you like the video, check out my channel for more reviews :)
The AKG K550 has excellent build quality, with a great fit and finish and a solid, durable feel to the materials.
Pros: Comfortable, spacious open sound, great build quality
Cons: Very sensitive to seal, overall lean sound, somewhat raw treble, slightly heavy
Excerpt: Le casque AKG K550 aurait été conçu comme un casque audio de luxe pour usage nomade. Avec son poids dépassant les 300 g et ses oreillettes de 11 cm de diamètre, il semble qu'il ait erreur de casting. Heureusement pour AKG, le fait d'être soi-disant nomade n'est pas son seul argument.
Pros: Construction et design luxueux, Excellent confort, Restitution sonore très précise, Définition et spatialisation stéréo