It's a 12". I tested both vc's and they work. I have 12"s hooked up in a box but I haven't had time to put this in the box yet. I will tomorrow tho. My amps aren't the greatest, if it is powerful I won't know anyway. ThanksHuge is a relative term. What size is the sub? Not anything special but no slouch either. I'm sure it offers acceptable performance in the right enclosure