I just got a brand new Razer Kraken Tournament Edition, and I spend hours customizing my setting to make it sound perfect, and I thought that I should share it, to help people start configuring their eq settings.
31Hz - +6
63Hz - +4
125Hz - +2
250Hz - +1
500Hz - 0
1kHz - +2
2kHz - +1
4kHz - +2
8kHz - +3
16kHz - +5
With sound normalization at 25, and finally bass around 60%
Of course your may like other settings, but I think that this is a good place to start.
Did this work as a base for your best eq settings?