I have 2 12 inch subwoofers in a ported box. They work and sound great. I'm selling them because they are to big for my truck. I love these subs buy they are just not practical for my vehicle. These are Insignia subs with dual voice coils. They are rated at 600W RMS and 1800W Peak. I've been running them with an 800W amp and that has been pushing them hard. Here is a link to Insignias web-site for more information about the sub. http://insigniaproducts.com/products/car/NS-SUB12.html. Call Sean at 801-427-3699 or seanholt007@gmail.com if you are interested or would like to hear them.