headunit has no switchable rear/sub preout?

[LongThrow]

Just bought a cheap *** walmart dual xdm260 and hooked my system up, I looked in my menu options and operation manual and don't see anything about it. Head unit has just one preout and doesn't even say front rear or sub on it.

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[CSCStang]

Just bought a cheap *** walmart dual xdm260 and hooked my system up, I looked in my menu options and operation manual and don't see anything about it. Head unit has just one preout and doesn't even say front rear or sub on it.

Take it back.....

 

[LongThrow]

I planned on that, I'm just on an extreme tight budget. I hoped I was just overlooking something and someone could help me. I didn't think it was normal for an aftermarket head unit to not have a switchable rear sub output.