OK, first of all you bought a piece of crap home theater in a box (HTiB). So offense intended, but those things do not allow the flexibility of expansion as you can tell. The C450 is last yrs model and has since been replaced by the C550. And it's not much better. The C450 does not have the latest HD decoding capabilities that is on a Blu-ray disc. Only a good quality Denon or Yamaha receiver that can support HDMI v1.4 and has HD decoding can you truly achieve both the quality sound and picture you seek. Plus they will last every bit of 10 yrs or more. Samsung makes good video products, but their audio just plain sucks. The C5900 player you have also has limitations. If the home theater you have has an HDMI input, then you can use that. But it won't support 3D. If the home theater you have has analog (red/white) audio inputs you can do that, but at best you will only hear Dolby Pro Logic. I could not find much about the C450 inputs, but the Blu-ray player was easy. I suggest you crack open both manuals and see what they both can do. If I were there I could easily help you. You can email me anytime.