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i would check the speaker cables to see if something came disconnected first maybe wire i touching other terminal shorted out the channels output .
run a new set of rca cable to see if one use are bad . check to see if rca cables pluged into right output of radio . check to see if your remote wire is powering up the amp to turn on the amp ..
will still light up with battery power but will never put output to the speakers with out the remote turn from the radio ... how to check this is to disconnect the cable at the amp and take a short 18 gauge wire and strip both ends and touch the battery terminal at the amp terminal one end the other end where the remote wire is mounted on the amp if do this for a few seconds to see what happens or better yet buy a digital volt meter and check for 12volt a the remote wire when you turn on your radio
Blown protection circuit at best. Blown power supply and IC's at worst. Send it to a service center for an estimate, educated guess without having it on a bench in front of me $150-200 repair. To test for the possibility that it's not the amp, disconnect speakers and turn power on. If it stays clean, no"protection", check your subs for a shorted voice coil. Hope this helps.
for $85 i can sell you an Almani 900 watt 2 channel amp i would stay way away from those 3 brands they are all really poor quality and i can get you any major name brand cheaper.
I can get you a hifonics 4008 amp (800 watts peak 100 watts per channel rms) for $100 shipped with full factory warranty. you find an amp you like and i will get you a price. I am a factory wholesale distributor for most brands.
first whats the range in terms of WATTS that your 12" sub can handle in 4 OHMS ? second , lets check the AMP , POWER ACOUSTIK 1800 WATTS , Now thats a lot of power to drive a single 12" sub speaker . your amp is 1800 watts , per channel is around 500 watts , if BRIDGE thats around 1600 watts rms for ONE channel , if your sub can handle that kind of wattage fine , but it will not blow the amp , what it does is shuts down , some kind of protection mode , it will come back on after a minute or so. I suggest to use one channel in stereo mode , or purchase another sub to use the other channel. i hope this helps AJ