Headphones

Hey yall

I got a pair of CCA C12 IEMs. I know they are Chinese and not on the level with super expensive ones, but when I plugged them in they were very tinny. Not much base at all. I got them to play FPS games because people say you can hear quieter sounds good with them and they are more comfortable for long sessions. I currently use DT990 pros and a SoundBlaster amp. The DT990 are so much clearer and rich than the IEMs. Do I need to adjust the equalizer somehow or is it just the way it is? The only good part was that the IEMs could be used at a lower volume than the DTs. Thanks for any help before I return the IEMs