Mtx RFL's **** from my experience with them. Me and a friend ran 2 of them for a couple months. The subs are way too hard to get loud, we had heard that if you were to cut 1 or 2 of the spiders out they would get off a little better with lower power, We threw around 3600 watts too one of them and it barely moved really. Blew one of them after around 2 or 3 burps, and had to recone it. They are just too hard to get loud, if you have an extreme ammount of power and a wall, i could see them putting up some big numbers, in fact the dude we bought them off of threw 8000 to each woofer in a wall, and was doing high 60's on an AC meter. Still have one of the RFL's just sitting in the corner of my friends house, the other one he sold to a dude, who put it in a dodge stealth with around 5 cubes tuned to 44 hz. Sounds absolutely horrible, but he actually daily beats the living piss out of it, i honestly dont know how it hasnt already blown, hes powering it with a hifonics bxi2005d, when you push in on the cone it just sinks in easily now instead of being extremely tight and hard. I would never run an RFL again, but thats just me, what do i know lol!