January 13, 2012 11:31:25 AM PST
How does it sound? If it sounds good I would disregard what the RTA shows, because we don't listen with our eyes.
I've got a 5-band parametric EQ and checked things out a bit with an RTA app. I wondered the same thing about adding a processor with a more powerful equalizer.
If you stuck with Clarion to my knowledge you'd only be able to add the 1/2-DIN 7-band graphic equalizer, the EQS746. That's hardly an improvement over your 3-band parametric EQ. Beyond that there's a whole world of processors to choose from, depending on how much control you want.