I would recommend getting a used Audigy 2ZS(need a pci slot though) to install the KX Audio Drivers and use the high quality hardware based parametric EQ to smooth out the frequency response of your headphones to reduce peaks and dips in the response for a more flat response then tweak for preference if you feel you need a little more bass I for one defiantly like a boosted bass response so I can feel it the impact of the bass more but ideally as flat as possible(so no big dips or peaks in the bass response) to as low a frequency as possible at least to 30hz but the closer to 20HZ it can get before rolling off the better but almost no headphone or iem do that even with alot of boosting.
The alternative is using a free global software parametric EQ to do the same thing as above but it won't be as good quality as would be possible with the Audigy 2ZS and KX Drivers when EQing but you don't have to buy anything this way just use your current sound card and get the Parametric EQ and see how you like the sound quality after tweaking it, I don't personally use any software based EQ but I think this would work for a global software based parametric eq for windows.
Online Tone Generator Is a good tool when doing you can test the frequency response using the tones to see how your changes effect the sound and try to get the different frequencys to sound around the same volume. http://en.goldenears.net/ is another good tool they measure alot of headphones and iem and show the frequency response along with what flat response curve would look like this helps alot when doing the EQ as you can use this as a guide as to where to apply eq and then check with the online tone generator as there are variation between different headphones even if there the same model and everyone ears are different so the sound you hear is different from what I hear even on the same set.
If your can't find your headphone there then you just have to do it by scratch using tones and the hearing test as full spectrum tone sweep till you balance the sound I had to do this for the Audio Technica CKM500 still working on them but got them to where I'm happy with the sound the driver is really clean sounding to my ear just needed to correct all the peaks in the sound to get the best possible sound out of them.
And this is a long ass post but besides the EQing I mentioned above the best thing you can do to improve the sound quality of headphones or iem for music listening is installing foobar 2000 and using RPG WIzards Dolby Headphone Config really helps to fix the in your head sound your get from headphones improving the sound stage to be more speaker like while having minimal effect on the tonality of the sound which is where most of these type of headphone surround effects fall flat you may get a wider more out there effect but it destroys the original sound only useful for certain types of music and experimentation not full time use like this is imo.his forward settings is very close to a stock sound but with a improved sense of space and separation its really something to hear especially with a good pair of open headphones the wider the sound stage was before the better the improvements are but all headphones and iem can benefit.
This is only possible because of his impeccable hearing and dedication to perfecting hig plugin for foobar. He by ear used a parametric EQ to correct the Dolby Headphones response back to flat response to maintain the original sound but with improved sense of space and combined a few other plugins to get the effect. He actually used to use the Audigy 2ZS and KX drivers and really liked the EQ on it but that was only the ten band EQ but he loved how much you could boost the bass without any distortion or loss in quality if he had gotten his hand on the parametric eq with equally good quality but far better control over shaping the frequency response I wonder if he would have given it up?
You don't even need to setup anything as he has available for download pre configured mobile installs of foobar2000 so you can try out his dolby headphone effect with no effort I think you will come to like it as much as I do once you try it!
T:DR:Audigy 2 ZS with KX drivers offers incredible hardware based paramtric EQ you can save change setting on the fly for all your headphones,iem, and speakers to improve the sound with no distortion or loss in quality. Download an install a Global Parametric EQ to reduce peaks and dips in your headphones frequency response to improve sound quality at no cost if you don't want to buy the Audigy 2ZS. RPG WIzards Dolby Headphone config for Foobar 2000 is another essential improvement for sound quality of headphones for music listening.
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