When I plug in my line-out, Realtek HD Audio Manager pops up. It's got quite a few options and lets you save EQ presets. This was added when I upgraded my drivers after moving to Windows 10. Until I did that, I wasn't getting any sound at all.
Foobar2000, which is the player I use, also has an EQ but the Realtek manager is more convenient.
I'm plugging my PC into my stereo amp, though, which has its own built-in EQ.








