Replying to Xbox360: hdmi plus av cable?

Is it possible to fit a microsoft av cable and an hdmi cable in the pro console? I have a DD 5.1 sound system that has an adapter to av (which I can and do hook into the component hd av, but would prefer the slight picture difference of hdmi is possible) but it doesnt seem like there is enough room for both outputs... at least with the component. I don't have one but if someone has an old composite, can they see if it's smaller? Theoretically, then I could use hdmi picture and external sound via composite-adapter-system. Let me know what you think/know. thanks