@Gwooody Do you use Bluetooth?  If yes - then you will get much better basses by disabling Absolute Bluetooth volume (https://www.google.com/search?q=android+disable+absolute+volume). Also:
- for LDAC you'll get better results by using OpenSL Hi-Res output (enable for bluetooth)
- ensure you don't have Float32 Sample Format enabled (in OpenSL Hi-Res output or Audiotrack output, for Bluetooth device), it doesn't work well with Samsungs. Overall, S9+ @ 8.0 has full Poweramp hi-res, DVC support, but may require some adjustments. You should be able to set Bass to 100% and all the lower range equalizer bands to 100% without any distortion (on medium volume levels) on this device.