The Audio Nirvana Super 12 Neodymium is a traditional fullrange speaker with whizzer cone and phase plug.  It has a frequency response from 37 hz to almost 20,000 hz. You can expect at least 99 db efficiency in any of our cabinets. It handles 30 watts continuous RMS (normal listening level will be about 1/10 watt). Impedance is 8 ohms. Voice coil is 1.5 inches (38 mm). Total magnet weight is 1.9 lbs., using 9 individual elements. Total weight is 10 lbs. The cone is made of paper. The surround is accordion style and made of treated cloth. The phase plug is copper anodized, machined solid aluminum. The frame is cast aluminum. Our neodymium models are the most detailed and efficient Audio Nirvana models. We don't build larger fullrange for more bass, but because they have a much more detailed and natural midrange and treble. Audio Nirvana is the only company that has ever made true fullrange speakers larger than 8 inches. And we make 10's, 12's, and even 15's. We are over 10,000 pairs of Audio Nirvanas sold, in the last 13 years, with 100% money back guarantee. We have received only 7 pairs back.  Audio Nirvanas are the best sounding speakers in the world--at any price. For more information please visit us at www.commonsenseaudio.com.