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Possible that the audio output section is short . remove speakers and fix in the fuse to test, if itt blows out the fault must be confirmed by opening of the amp and disconnection of the power output driver.If teh fuse then stays the fault is confirmed. replace and test the speakers in this section before connecting.
First I hope you remove the speaker wires from the speaker that come from the built in amplifire. You cannot hook the powered sub to the amp without doing that first. Then all you need to do is run speaker wire from the sub out of the box to the amp. In no way can you hook up any other part of the powered sub, but the sub itself, to the amp. If you know the wattage of the sub and the ohms then wire it to the amp correctly. Your phoenix amp will put out 125 watts x 2 at 4 ohms and 250 watts x 2 at 2 ohms and 500 watts x 1 at 4 ohms bridged. Remember, only the sub itself in the sub enclosure can be connected to the amp. Hope this helped you. Let me know if you need more help.
I looked up that amp, it doesn't have a listing for 2ohms x1 but it has 2 ohms x 2 and its at 250watts. For this situation, I would recommend a different amp or different subs. Right now you are getting the most you can get out of your sub/amp combo, if you only have single voice coil subs. Which is common in the mtx preloaded boxes. Either you want an mono block amp stable at 2 ohms or 2 dual 4 ohm voice coil subs. If you got the subs you would wire the voice coils in series so you could get 8 ohms then the subs in parallel so you could get 4 ohms, which would be the best for that particular amp. Good luck.