Problem is one of four things:
Possible solutions:
SOURCE: Power Protection Circuit (SORT) Engaged
Umm a ohm meter would help you here. Double check the wires from the sub to the amp...make sure its not shorting out. Try starting the amp without the wires on the terminals...if the protection shows up then there is a short inside the unit and it will need to be replaced/repaired.
SOURCE: Sony Explode 4 channel amp in protection mode
sometimes if the power cable and the ground cable are frayed and touch it will short out the amp temporarily check to make sure allof the wires aren't touching each other
SOURCE: bass sounds flat when volume is increased
probably your power is too short, increase your gauge wire, and your ground wire of the amplifier has to be shortly as possible, and the positive has to be enough to support peak power, you can also put a big capacitor on the positive wire to give some more power while the bass peak.
SOURCE: car audio amp in protection mode
If you power up the amp with the RCAs plugged in, does it go into protection mode.
If you power up the amp with the RCAs plugged in, does the woofer pop?
SOURCE: kole amp in protect mode?
Are you setting the bridge switch for both left and right or are you trying to run both subs off of one set of terminals? If you running the subs off one set of terminals you are effectively running the amp below 2ohms and thus the amp is not 2ohm stable and you will destroy it.
Some amps actually all ready run a bridged output for left/right operation, this could also be the reason why the protection circuit is kicking on.
Either way it's a component mismatch and you either need a stronger amp or different subwoofer setup.
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