. It's always extremely interesting to see measurements after a serious time of listening. And trying to understand how measurements and Listening impresssions can match is a big question for me.
It seems I can recognize what I heard except I'm hearing more difference in the treble. the 880 can be bothersome for me while 840 treble sound a bit softer to my ears. I don't understand why i can't see this difference in measurements. Maybe the biggest bass does make the difference and mask more the treble peak ? Dunno but the two headphones does not sound as similar as your measurements suggest .. to my ears at least.
When I compare the three Ultrasone series I rate them like this :
Bass amount : 840 > 880 >> 860 ( still an hearable mid bass boost though)
Treble harshness : 860 >> 880 > 840
Mids clarity : 860 >> 880 > 840
Can the differences could be explained only by the different amount of bass that overwhelms more or less the whole spectrum and make me feel the mid/ treble amount are different ?
I'm more used to read Tyll's measurements so I have some questions :what does mean the THD number : 2,5 for the 840 and 3,25 for the 880 ? is it the average distorsion ? the lowest ? I don't see any scale for THD on the ordinate axis .
My listening impressions :
- Bassy headphone with low quality boomy bass. i feel the 880 bass are worst despite there's less bass boost.
- Not too sucked midrange . I could even say good mids for so bassy headphones.
- treble emphasis ( more with the 880 than with the 840 and even more with the 860) .
- Good soundstage for a closed can. wide and deep. I would not have said that those headphones lack of air myself.
- Energetic and lively sound. engaging despite the obvious flaws.
Overally Meh headphone. Bad for an audiophile , not so bad for average consumer who likes bassy heaphones. Definitely not for me.