Sub making cracking noise

[Newbie]

Hey, iknow my system is shitty, but i got a mtx4000 (12) powerd by a 200 watt jenson, so the rms fo rhte sub is about 150, same with the amp, and the max of the sub is 400 while the amp is 200, and it is making a cracking sound when i crank it up, i understand its not anything amazing, but i dont' think it should be doing that. please respond, thanks a lot

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