My subwoofer has started popping ramdomly

[StutterB0B]

I recently installed my sub (Pioneer TS-SW3001S4) and amp (Dual xpe2700) from my old truck in my new one I had that setup for about 2 years with no problems and a few days ago I was waiting for someone not playing any music and it started making a popping sound that my friend later described as "Your truck is making coffee". I have never gotten close to pushing my system to the point of blowing it out so it couldn't be that. Any idea what it causing it?

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[C1500martin 10+ year member]

bad ground?

 

[boomzabit 10+ year member]

That amp is beyond junk and may be the culprit