Low quality music when another application with sound is open

[girlinawar]

Plan: Premium

Country: Spain

Device: Macbook Air Retina, 13'', 2019

Operating System : MacOS Catalina 10.15.4

My Question or Issue: When I open Spotify and listen to music, and I am also listening to another application/page with sound, the quality of Spotify music is very low (it's like it's going into the background). Is there any way to fix this? Thanks for your help.