I have one of the CV 104 Vega series subs, and am very pleased. I bought mine 3 years ago at a very discounted rate. A friend of mine had Best Buy wharehouse connections. At the time they offered the highest SPL of the other subs sold in local electronic stores. The higher the manufacturers SPL rating, then the more efficient the Sub turns wattage into clean musical sound. I have not been able to push mine to the limit. They take 300watts RMS and 600Max. I have only run mine at 150watts RMS and 300 max. But at 150 watts into a single CV104 I was able to get 119db in my 97 F150! Unfortunately my truck is up for sale and I need money for an upcoming baby, so my sub and box is up for sale also. It is a single CV104 in a custom built ported mdf box that fit behind the seat of my regular cab truck. email me if you're interested in seeing pics and want to buy it. harmdiggy@yahoo.com