Sub is not built with quality, cheap parts, can't even handle 1500rms without it smelling like burnt coil, and no it was not distorting. I have my amp tuned perfectly (using an oscope to match the voltage from the headunit to the amps gain knob). People talking about breaking windows with this subs is just false and lies. I have 3500rms going to my DC audio level 5 15 and I got no problem with my car falling apart. Why? Because I don't make up stories about stuff braking, but I do get some flex for sure. Amp I had it connected with the L7 was a crescendo bc3500 @2 ohms, now wih my dc level 5, I have it wired to .7 ohm(yes this amp stable under 1 ohm) and will not even get warm. Don't buy this sub, its a waste of money. Get yourself a DC sound lab sub, you will not regret it for sure.