Reply to s4 Help

Just braught home my studio monitors and i hooked it up to my new s4 and I dont know how to adjust my audio levels. Its either my monitors , s4 , or laptop that Im having issues with. Is it problem that music that my music is on my external connected usb to my laptop. I believe im hearing clipping when i play tracks on my s4. Espcially when im doing more than 1 thing and the FX also. I dont know what the problem is.

I really dont believe my monitors or s4 is the issue? Any advice would be ok.