The FBT Maxx 100sa powered subwoofer features a 13-ply birch plywood cabinet with scratch & scuff resistant black paint finish. The FBT Maxx 100 sa features a custom designed B&C 18" woofer with a 4" voice coil, neodymium magnet structure and an aluminum die cast frame. The active internal stereo crossover is at a fixed frequency of 120Hz. The Maxx 100sa offers a frequency range of 36Hz-125Hz, providing floor shaking low frequency extension with a SPL of 135dB. FBT's ADAP Advanced Dynamic Active Protection circuitry protects speaker/driver components against failure. The Maxx 100sa powered subwoofer features a 900W RMS Class D, passively cooled (no fan) low frequency amp, that provides 90% efficiency. The FBT Maxx 100sa amplifier design, like all FBT Powered Maxx speakers prevents annoying thermal shutdowns that plague many other powered speakers and powered subwoofers. The control panel features a master volume control, balanced left & right channel Neutrik input combo jacks (female XLR, 1/4" TRS, 1/4"), balanced XLR left & right channel link output jacks, balanced left & right channel filtered outputs to connect 2-way full-range satellite speakers, and a ground lift switch, LED power on and a LF overload LED indicator. A standard top mount 1 3/8" speaker stand socket allows satellite speakers, such as the FBT Maxx 2a, Maxx 4a, Maxx 5a and Maxx 6a, Hi Maxx 40a, Hi Maxx 60a and others to be placed above the subwoofer cab on an adjustable satellite speaker pole mount, such as the FBT Box 52. Applications Low frequency extension for Live Sound P.A. System, D.J. System School & corporate audio visual sound reinforcement Background music: Restaurants, Pubs, Clubs, Auditoriums, Theatres, Gyms, Houses of Worship Features 13 ply Birch Plywood Cabinet w/Tour Grade black pain finish Power Output: 900W RMS, 1800W continuous program power High SPL capability: 133dB with music source Control Panel with Master Volume Control, 0° -180° Phase reversal switch, left and right channel balanced inputs, link outs, left and right channel balanced filtered outputs, ground lift switch, Neutrik XLR balanced ins/outs Top mount satellite speaker socket Optional carrying bags available for protection for portable use Completely manufactured in Italy 3 year warranty Specifications System Type: 1 way, Bass Reflex design Components: B&C 18" LF woofer Frequency Response: 36Hz-120Hz Suspension Points: Eight M-10 Power Output: 900W RMS, 1800W program power Sensitivity: 100dB @ 1 watt, 1 meter Maximum SPL: 133 dB Active Crossover Frequency: 120Hz Dispersion: Omnidirectional Protection: FBT ADAP Protection circuitry Inputs: Balanced Neutrik combo jack, XLR, 1/4" TRS Outputs: Balanced Neutrik XLR link out Enclosure Material: 3/4"-13 play Birch plywood Dimensions (W x H x D): 20.89" x 23.2" x 26.9"