The fact that the head unit cut out and went into protect implies that it probably has nothing to do with your pioneer amplifier. If i understood well the amplifier is running the sub woofer. If the speakers are running off the head unit check that there is no speaker cable touching metal causing a short. Sometimes while installing the speaker we don't realize that the speaker terminal can touch on the frame of the surface that it is secured to. If this surface is metal then you get a short, which then makes the head unit go into protect. There is also the possibility that a cable from behind the head unit has come lose or is bare in some place touching metal again. You see it is all usually about being shorted. Without knowing exactly how everything is installed, this is the best i can do. I hope this helps. dreamsystems
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