The FBT Verve 15s Subwoofer features a 13 ply birch plywood cabinet with Scratch & Scuff resistant black paint finish. The FBT Verve 15s features a custom designed B&C® 15” woofer with a 3" voice coil, a neodymium magnet structure and an aluminum die cast frame. The Verve 15s offers a frequency range of 40Hz -200Hz, with a SPL of 126 dB. A standard Top Mount 1? speaker stand socket allows satellite speakers, such as the FBT Verve 10, Verve 12, Verve 15, and FBT Maxx , HiMaxx, ProMaxx, FBT Jolly speakers to placed above the subwoofer cab on an adjustable satellite speaker pole mount, such as the FBT Box 52.