Ok so I have changed my setup I want to run. Thinking just 1 18 now. I have the room that's not a issue. Been looking at these subs, I see the rms is 600. Is this true or will they take more safely ? Looking for info on some good 18's. I've ran DD before but looking at what else is out there and sounds good. I still have my old box I built years ago just little over 7 cubes net. With 60 sqin of port tuned at 32. Don't know if I could still use that with a new sub, if I have to remake another box that's fine. Sub is going to be powered by a CT 1400.1