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I think we have reached the limits of headphone design in general and the various design tradeoffs for upper mids and treble reproduction in close to the ear transducers. There are major design problems in four areas:
1. Ringing and grain.
2. Grossly wrong amount of upper mids and lower treble. Frequency response issue
3. Air/high treble FR
4. Timbre/weight/authority issues. It's weird to talk about treble authority but sparkly cymbals should shimmer! A full body weight cymbal slam should feel like it. Cymbal rides should not sound plastic.
The HD 650 overcomes 2, and 4 by damping the driver. Sennheiser correcting 2 causes problems with 1 and 3. Removing the back foam negates 2 in a way. It has the some of the least offensive amount of treble for headphones that have treble and aren't completely rolled off like the prefazor LCD-3 or the UE6000 and Roland muddy closed ***** cans. The 580/600 are shoutier and actually ring more my experience even though they are better at the proper amount of air while the 800 just has a ridiculously offensive voicing and lacks weight like an electrostat but not as bad.
The DT-880 and DT-990 (250 and 600 ohms versions) are better about 1 and 3 but just horrifically offensively bad about 2 due to 1980s diffuse field treble lunacy and Beyerdynamic's "We don't damp *****" approach. When you hit volcanic peak of the Beyer treble Mount Doom at 10khz with the over 2ms of ringing. That is utter pain, false detail, recording artifact highlight and taunting insanity. They also sound oddly metallic so they screw up timbre.
Electrostats and planars have their own problems. Planars with upper mid suckout and ringing. They frequently have false detail spikes at 9-11 khz too that grit up the treble like it's covered in sand. All electrostats have timbre and planar-like FR issues but succeed at ringing or treble air. The Koss has the smoothest FR if it seals but has a slight upper mid bump followed by some planar-like upper mid suckout and isn't as resolving as the better dynamics like the HD 580's children. Saying dynamic drivers are actually worse and "lower fidelity" is insane as they obviously achieve a more speaker like timbre and speakers are the standard whether you like it or not.
All headphones are trashy sounding compared to good monitor speakers in even a semi-treated room. Treat the walls behind you and the speakers in a mimalist, home office type space, correctly EQ (or get someone else to or buy something like the Sonarworks kit) a decent pair of near fields (these will cost you about the same as a TOTL in price headphone) , and except for bass you'll just have a higher fidelity personal audio experience. The HD 600/650 make sacrifices to come much closer to this tonality wise than other hi-fi headphones is what I am trying to get at.
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