Ive used an alpine digital 12 band and a clarion analog 7 band and neither were as good as the built in 11 band parametric in the old JVC ar-680 mp3 player I used to have.

If you cant get your sound right, change the speakers over adding an EQ.

If you absolutely have to have an EQ, make sure you have premium wiring and filter the hell out of the power supply for the head unit and the EQ.