Answers: No. The bass tube would correct the impedance (ohm) load to the amp and you would have an inequality of power.
You'll need another amp for the bass tube.
You can make it work near the stuff you have. Some people will run the bass electrics out of the rear speaker channels. You would run the positive cable out of one rear speaker's (+) output (on the amp) and connect the negative lead to the (-) of the other rear speaker output. Connect the rear speakers as majority.
This is assuming that you will be directing most of your bass to your rear speakers. Another way around this is to use a crossover to direct foot, midrange, and treble to specified speakers. But that may mean getting a second amp.
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