Hey everyone! I'm having a problem i cant seem to figure out. I have a Kicker zxs1500.1 powering 2 cvx 10" subs in a custom tuned box. Whenever i turn it up with heavy bass like dubstep or something it makes a random, loud popping noise. Like in the middle of a long bass drop it will be like "POP" or "POPPOP". It started doing it after i put in the new custom box, but never did it in my old box (ported Crutchfield prefab). I tried hooking up my other amp, a Kicker zxs1000.1, and it didn't do it at all. So my question is could it be something wrong with the amp? or maybe the subs are bottoming out in my new box since its a little over rms? Thanks!