Don't listen to people who tell you there are "non-linearities" or "harmonic distortions" because these measurements are made using non-realistic means (a dummy head with uncertain coupling).
And I can't imagine any transducer that doesn't have "harmonic distortions" and "non-linearities".
You have to listen to them to determine if they sound good to you. I have headphones that cost $120 to headphones that cost $1500. They sound different, and I use them for different purposes. Is one the best? No, it depends on why I'm using them. Do I need acoustic isolation? Do I want full frequency response while loud? Do I want transparency even if I have to play the headphones softly?
So find somebody who has the ones you are considering and listen to them. The 1840s are at least as good as the Sennheiser 650's. I find them more comfortable, and more honestly balanced. But you need to decide. It is all taste with headphones in my opinion. Yes there are certain types that are remarkably real like the in ear shure headphones SE425 that sound amazingly truthful, but you can't use these kind of headphones in all situations. If you are monitoring during a recording session, you may need acoustic isolation in a pair you can remove quickly like the shure 940. You may want the best fidelity Shure 1840. Try each and see what you like.
No, it's still a flaw. Whether you hear it or not, or if you do hear it, whether you care or not, is entirely up to the person. Measurements are measurements: they aren't unrealistic nor realistic: they simply 'are'. What InnerFidelity shows is above-average THD. Personally, I don't really hear it, so I don't particularly care for it.
Main problem about your comparison with the 1840's and 650's is that they're pretty much the polar opposite. 1840 is bright, 650 is dark. The 1840 (and less so, the 1440) are excellent for critical music applications, but for me, anything besides that, and there's much better cans to consider.
Guys is there any harmonic distortions on SRH 1440. Innerfedility graph shows distortions in the curve .
Do SRH 1440 have many harmonic distortions like depicted in the graph?
Some one told me all I couldbhear is distortions in SRH 1440 is that true ?
Is the trebble harsh in SRH1440 ?
I'm going to buy SRH 1440 ,though Im a basshead , wanna see i may love mids treble in SRH 1440 .
Can I boost the bass in SRH 1440 through an EQ or does it make bass bloated ?
Any suggestions to improve bass on SRH1440 is appreciated like through fiio amps (Fiio E07k , bass adjustments )
If you're a basshead, avoid the SRH1440/1840. It's even less bassy than the HD600 for me. If you've already purchased it, your only option is EQ-ing.
This is assuming that the only variable that's changed is the headphone, of course.
Edited by dazzerfong - 6/8/15 at 11:40pm