My HU has four outputs so thats not a problem (an unexpected benefit of getting this HU instead of the SH707 that I was originally planning on). I don't really have any intentions of getting a sub or running the rear speakers on anything but the HU, so I think I'll be fine. If I do get a sub at some point then I could just take two of the four RCA inputs and run them over to the sub amp. As far as cost, I don't think one RCA and two splitters would be any cheaper than one 4 channel RCA cable.
I think my original question has been answered, I need to have 4 RCA inputs regardless of how I go about it. Thanks guys for all the help!
