i had my mt 18 in a small azz ported box with two 2500d's on it, it was a dual .7 iirc. I wailed on it and it never blew, unlike the last 3 subs i've had in my car the last 3 days //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif hahaha anyways... just take care of it and I am sure you will be fine.