Razer kraken chroma 7.1, EQ SETTINGS FOR FPS GAMES (CSGO)

Whatever sounds good to you. Everyone's ears are different and what sounds good to one person won't sound good to you, or vice versa. If you ears don't hear higher frequencies too well, then you'd want that turned up, where as if you are too sensitive too them, then someones settings with the highs turned up is going to sound shrilly to you.