So here's the deal. 650s arrived today.... Been on my head for a while.
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Vs the AKG K7XX (modded):
Duke Ellington - Villes Ville Is The Place, Man (FLAC 24bit 88kHz from SACD).
Immediately obvious is that string instruments and symbols are warmer, more forward and with more definition. Stereo imaging not as wide feeling as the K7XX and the bass not as low down either. I'd say the HD650 sounds the most natural of the two with this track. Before I'd heard the 650 I thought the K7XX sounded very natural with this track
Shy Girls - Arrest Me (ft. Tei Shi) (MP3 320k iTunes encode).
When Tei Shi's vocals come in the texture of her voice is more musky. Hard to choose a winner here. The K7XX with wider soundstage makes this track very enjoyable, but the detail and texture of the HD650 feels more natural and live.
Build quality is a league above the AKGs, but the little HD650 emblem area of each can looks and feels cheap/tacky. This should have been metal IMO not some cheap looking piece of plastic.
The pads are smaller than the AKG, the foam rests on my outer ear whereas the AKG has a nice round margin. I'll get used to it...
I can see what people say when they mention the 600/650 being dark/darker still.
Think I'll be keeping these.
One thing is clear, the 650s are less forgiving to poor masterings/encodes compared to the K7XX.
Shorter cable to be ordered too.