Equalizer

I was wondering if there is an equalizer out there that will work for all sound that comes out of my computer and its speakers?
Thanks

Hardware or software?

Software first preferably but if there is cheap hardware i have logitech z-5300e

I’m running a X-Fi Creative sound card with 5.1 Klipsch Pro Media speakers and my card came with EQ software plus i can tweak bass and treble. I’m not sure about add on software EQ’s sorry.

What sound card do you have?

SupremeFX it came with my ASUS P5N32-SLI Premium. With that sound card can you tweak stuff other then treble and bass?