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A universal remote that has "code search" capability can be used to find a code that will work with your RCA home theatre. If you search through all codes contained in the remote without success, you may have to try another universal remote because all universal remotes do not contain all codes for every device.
If the system uses a remote control, you may need to adjust the subwoofer out signal setting or turn on the sub in a menu, and on many systems, you can only access those settings via a remote control (you should check the onkyo user manual on how to do it).
Now, this is just one suggestion, it may work, but then again, it may not.
These could also be connection problems or some internal trouble in the onkyo sub signal output section or in the subwoofer input section, but hopefuly, it's just a "turn on" or "signal level" setting in a menu.
You cannot wire this system separately, since it is very difficult to separate the power cables from the others which carry the audio parts.if in any case , lets suppose, you could wire the dvd player separetely, you will have no audio since all the audio frequencies are transfered in this cable to the sub woofer and from there to the satellite speakers.
It would be useless to wire it even if we could as there would never be any audio, only video, no matter what disc you use as the only way the audio is comming is throught this system cable to the subwoofer. Actually its the worst idea to implement in a home cinema system, but well, this is old panasonic.. :)