Why not? It sounded better with the AKG K702.
It's entirely up to you of course, but I just think it's pointless when you have to have the volume at a mere 8% before it's too loud.
The headphones sounding better with when set to higher gain, is because gain boosts the volume. We automatically assume that louder = better sound quality.
If someone were blind tested with what they thought were two different headphones; but they were actually the same model of headphone, just one pair playing the same music but a bit louder than the other pair. You could pretty much guarantee that the majority of people would say that the pair of headphones playing the louder music are the better sounding.
Also; you may not do this, but I've seen people say that they have different programs/apps set at different volumes within the Windows volume mixer. The lower the master volume, makes it harder to set different apps at different volumes, as you only have a small amount of leeway. I've done that in the past, and trying to do that with master volume set so low, is a pain in the butt.
No reason why you shouldn't continue using high gain though, if that's what you prefer to do. Horses for courses and all that. Just trying to explain giving the headphones a higher gain setting, doesn't actually improve the sound, it just makes them louder for any given % of volume.
Sgavan which do you prefer between the K702 and DT990? Out of the two I went with the K702 but was unable to try the DT990. Now I'm starting to think that maybe I made the wrong choice as the 702 hurt my ears a little and sound better if I don't wear my glasses. I know the DT990 has softer ear cushions so maybe they would fit around my glasses arms a bit better.
Any glasses wearers able to give their input in either of the 2 hps?
For non glasses wearers; I wouldn't have thought there would be much difference between the two, comfort wise. The biggest discomfort factor for the K702's was removed, when AKG got rid of the 'torture bumps' on the headband. For glasses wearers, it could be the clamp force contributing to discomfort when wearing glasses. I suppose it depends whether the K702's clamp more than the DT990's. Maybe how soft the pads are would also play a part.
Must admit I'm a little surprised you find they sound better when not wearing glasses. That would suggest the headphones need a good seal; wearing glasses would break that seal. This is what happens when people wear glasses when using AKG K550 headphones, as they are closed back and rely a good seal. K702 being open back; it's not often considered that open back headphones need a seal.
Thinking about it more; you could say that there is a seal between the front of the driver, the ear pads and the listener's head; even if there is none between the back of the driver and the ear cups.
Would be interesting to see what other people find who wear glasses, when using full size open back headphones with and without glasses on.
Performance wise; for music, it comes down to preference. For gaming, the K702's perform better.
That was going to be my next question, which impedance setting are you using? I'm currently using the middle setting, something like 62 - 150ohm. The K702 are 62ohm but I keep hearing that they are hard to drive even though they have a relatively low impedance.
They are known as being 'hard to drive' because they are insensitive headphones (93dB/mW), so need more power to output the same dB compared to most headphones at a similar Ohm rating, and even ones with higher impedance.
They are not so much 'hard to drive' at lower volume, it's more when the volume is really turned up loud they require more power than a lot of devices can provide. At a lower volume, a sound card without a headphone amp or decent onboard audio will drive them fine, as long as the user doesn't expect really loud volume.
Just as an example compared to some other popular headphones; Sennheiser HD598 are fairly close in impedance, but the K702 need 4x as much power to reach the same dB.
Comparing the K702 to the DT990; the K702 need twice as much power to reach the same dB as the DT990, but are 1/4 of the impedance.
Quite a few people think that higher impedance means more difficult to drive and therefore means better quality. K702 shows that is not the case, and judging solely on impedance is rather misleading.
Use whichever gain setting suits you. Using a higher gain just means you will need to turn the volume down, unless you like it very loud. As I explained above, setting the gain higher doesn't make the headphones sound better, just louder; and pretty much everyone automatically mistakes speaker or headphones that sound louder as having better sounding quality.