The receivers and pre/pros that I've seen convert composite and s-video to component have not gone the other way. I'd suspect the 990 will behave similarly. Building a backconversion like that wouldn't offer any benefit in image quality (might even cause some problems). In the event that the component input was carrying porgressive scan or HD material, there would be the additional burden of interlacing and/or scaling the image. I'd plan to stick with s-video from your sources.