Yeah, I went to the website and couldnt find them either. *shrug* My guess is they stopped making them because of the rediculous price. Anyways, Im running mine with the fatory amp and radio controls and it sounds just fine except for when you turn it up to ear piercing levels. I also spliced a JBL powervalve sub amp into the speaker outputs for some additional thump. And yes, the kappas sound really good as well.