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Sounds like your power supply to the amp. Make sure you location has plenty of air flow around it and use at least 10 gauge wire to the power input. Same size on the ground and make sure all contacts are clean. Your alternator will run hot when the sound is cranked and the car is moving. The heat lowers the amperage output of the alternator and will cause the amp to cut in and out.
Make sure your remote wire is hooked up in the right spot, also check your rca plugs and consider replacing them, check all fuses to make sure their not blown, a loose or not good ground wire or power supply wire will also cause this problem. If a power wire has a cut in it, that will also cause fuses to blow, as well as with a ground wire cut, ur amp will not be properly grounded.
Hi mate very nice amp you got there here is the specs for it
Model: MA Audio HK401SX
Hard Kore Series 1800 Watt 1 Channel High Performance Class
X Car Amplifier
1 x 1800W RMS @ 0.5 Ohm Mono
1 x 1200W RMS
@ 1 Ohm Mono
1 x 650W RMS @
2 Ohm Mono
1 x 500W RMS @
4 Ohm Mono Fully Unregulated MOSFET Power
Supply 2 Ohm Stable @ Mono 1 Ohm Stable @ Mono 0.5 Ohm Stable @ Mono
if you have 2 12s just bridge them and you will have 650wrms at 2ohm running to them or one sub at 4 ohm 500w rms ps they should pump iam running 2 12s with just 360rms at 2ohm and they do the job good luck
your subwoofer is wired incorrectly to your amplifier. Figure out which ohm load of subs you have and then what ohm load options your amp is stable at. Next go to either the Crutchfield website. find their learning center. go to subwoofer wiring diagrams. or go to www.the12volt.com and find their section on it