SVS SB4000 Subwoofer is a top choice for home theatre and audiophile music systems, the SB4000 Subwoofer delivers massive SPLs and extreme low frequency extension that will astonish even the most discerning listeners. A high-excursion 13.5-inch driver unleashes immense sonic energy while maintaining pinpoint control and accuracy from a 1,200 watts RMS, 4,000+ watts peak power amplifier featuring fully discrete MOSFET output and Analogue Devices most advanced audio DSP. Precise tuning for the SB-4000 is enabled from a subwoofer DSP smartphone app with custom presets. The SB4000 subwoofer delivers on the full potential of the Sledge STA-1200D amplifier’s power with precision and control to produce room energising SPLs and effortless low frequency extension with pinpoint accuracy at all drive levels. Dual ferrite magnet motor assembly weighing nearly 40lbs generates immense magnetic force and excursion of the 13.5-inch driver to produce massive low frequency output well below the limits of human hearing. Edge wound voice coil with eight-layer aluminium flat wire minimises distortion and power compression while providing excellent heat dissipation and linearity ensuring precise control. Lightweight and rigid composite cone with premium glass fibre dust cap generate massive output with pinpoint accurate frequency response. Proprietary injection molded gasket and long-throw parabolic surround ensure longevity and allow extreme excursion and SPLs. Chest-thumping slam and low frequency extension below the threshold of human hearing, with refined musicality – a level of subwoofer performance not seen at this price before. The SB4000 Subwoofer's sophisticated DSP amplifier, innovative driver and a sealed box design master room gain and command a space with deeper bass and higher output levels than what is typically possible from a subwoofer of its size. The SB4000 sets all performance benchmarks for a subwoofer and leaves larger and more expensive subs trembling in its wake.