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With-out a clear goal post it is gonna be hard to score. You really have to give us what you are looking for in your sound quest.
"Better and Clearer" Meh hell change any component that you currently have and you can achieve that or, play with your DSP and you can achieve that.
Sound stream and kappa's have been the go-too. But they are going the way of the PBR. Just old technology. Good cheap power but it has its limits and not a great SQ amp.
You spent money on a DSP, you have a "ok" head-unit. Figure out where you want to end up. You are at your limits with the SS amp and Kappa's.
At least give a definitive budget and that would be more help with equipment selection.
This is a "system" all parts need to play together especially if you are looking into the pro audio side.
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