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first check to see that the fader is not programmed to the front speakers fading it rear might solve your problem, second if your stereo has a 4 ohm load requirement at the output and your new speakers are 8 ohms this will cut the power output in half, your best bet is to get an amp if these do not solve the problem.
Do you have the subwoofer amp connected to the pioneer thru pre amp connections; pre amp output of pioneer to pre amp input of Kicker amp. Page 10 of the manual explains how to adjust the subwoofer output. You can select the cutoff freq. that will pass to the subwoofer; The slopes don't match perfectly, but if you use the -12 slope , it should work fine.
80HZ same as kicker cut in freq
Are you getting any sound output at all from amplifier?
Is there a popping or banging coming from speaker?
It could possibly be a faulty output mosfet that is ocillating cause DC to leak onto the speaker output causing it to flip into protect.
It sounds like one or more of the output components is failing on the amp. You can contact Kicker support directly for instructions to return the amp for repair: email@example.com . Alternatively, if you have a local car audio shop that does component level repairs, they could perhaps save you some money and time.
If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible problems, do the following.
With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage drops below ~11 volts, you need to check the wiring feeding whichever line is dropping too low when the amp goes into protect.
If the voltage is OK, you need to check the speaker wiring and the speaker(s). Try it with a known good speaker if possible to see if the amp works normally.
did you set your gains and base boost also when you put sterio back in dash did you put rca's on proper outputs or the rca's could have pulled out when putting back in
you have high output and low output
are your subs getting sound to them at all any current going threw speaker wires to subs
radio settings might not be set to back end for subs this is a feature on most receivers to shut off back end subs