The FBT ProMaxx-15SA is a new 1200 watt RMS 15" powered sub from FBT. The max SPL on this unit is a whopping 136DB- tested using music not pink noise. At about 63 lbs, this is one of the most powerful lightest weight subs on the planet. FBT is known for making great lightweight powered subwoofers, and the Maxx9Sa proves it. The downside to that was the poly box didn't seem to be able to handle really high SPLs. This unit uses Baltic Birch construction to correct this but a much lighter weight can be achieved due to advances in amp and speaker technology. Rather than having a built-in crossover, FBT chose to let you choose the frequency at which the sub cuts off on the back of the unit.