To improve the sound quality of your Space Q45 headphones, follow these simple steps:

1. Make sure you're wearing Space Q45 in the correct position so they create a tight seal. This will enhance the sound quality and the noise cancellation effect.

2. Try different types of music and make sure the input audio source has no distortion or noise.

3. Try different EQ modes on the soundcore app and customize the EQ to your preference.

4. If you're using an Android phone that supports LDAC, turn it on and see if it helps. 

5. Hold the Power and Volume+ buttons at the same time for 5 seconds to reset Space Q45. The indicator light will flash red three times, which means that the reset was successful. If the indicator does not flash, then try resetting them again.