If your bass sounds weak or garbled when you hook it up as a 2 channel system, try using the balance control on the head.(all system speakers playing ) First, balance it left and note the output. Then balance it right and note the output again.
If the system sounded worse (meaning weak bass output) when centered or faded to one side VS the other, that sub is out of polarity with the rest of the system. Reverse the wires on that sub only and you should be good to go!
