Sound signature. The M50x’s place a heavy emphasis on bass, but not to the point of becoming overblown or bloated. They definitely are not neutral, and because of the deeper bass frequency, the mid-range becomes recessed (i.e. subdued). The treble on the M50x’s is pretty sizzlin’, and I have really enjoyed the heck out of them overall since Jan. 2013. The AD900x’s by contrast are more of a neutral headphone, with markedly less bass and an overall flatter sound signature. Some say the treble can become overwhelming, but for the most part these are pretty balanced across the spectrum.
Build/Construction. The 900x’s have somewhat of an awkward fit to some people. The headband adjustment comes in the form of winged pads, that adjust up and down based on the size of your head. They are said to do much better for folks with large melons. They are also known to droop down and become somewhat loose over time, requiring frequent adjustment. The M50x’s by contrast sport a traditional headband adjustment, and fit pretty darned snugly on your cantaloupe. They do not need as frequent of an adjustment as the 900x’s.
Ear-cups. The 900x’s cups are made of velour padding and are circular. The M50x’s are pleather and conform to the shape of your ear a bit better.
Cable. The M50’x have a detachable cable while the 900x’s do not.
Movement. The M50x’s can fold and contort in a myriad of ways, adding to their extremely solid build quality and longevity. The 900x’s are not flexible.
Connector. The M50x’s connector is made of stainless steel and is incredibly durable. It is screw on. The 900x’s is made of plastic and snaps on.
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As outlined in my ATH AD900x vs. HD598 review, the 900x’s are a decent set of headphones but don’t make the cut without some assistance (different ear-pads & a ghetto rubber band mod). If you’re looking for an open back headphone in this price range, similar to the 900x but better in all respects, the 598 is the way to go.
If you’re looking for a closed back model, the M50x is an incredibly fun headphone and does get a high endorsement from me. Though marketed as a mixing/reference can, it really isn’t. It’s more for the casual consumer looking for a sweet entry level audiophile can. If that’s what you’re after, it makes a wonderful solution.
Stu is determined to help you make sound decisions, and strives to deliver the best and most in depth content on the internet! In his spare time, he likes to fish, paint, play guitar, pray, rap, make beats, take photos, record videos, graphic design, and more. His sense of humour, coupled with a knack for excellence and strict attention to detail are what allow him to stand out in an crowded industry.