ds8.0 800watt class d subwoofer plate amplifier with active filtering. specifications general features: - high efficiency class d design - active subwoofer amplifier technical data: continuous output power (8 ohm): 530 watts (+0, -0.5db) continuous output power (4 ohm): 800 watts (+0, -0.5db) subsonnic-filter: 12hz / -3db, 24db/octave phase: 0° - 180°, 180° - 360° crossover frequency subwoofer: 50hz - 150hz, 18db/octave bassboost: 20hz - 50hz bossboost level: 0db - +6db damping factor: 1000 protection: output shortcut / dc-error crossover filtering: linkwitz-riley, 24db/octave input impedance rca: 10kohm input impedance xlr: 10kohm 230/115vac switchable mechanical data: dimensions: 267mm x 267mm x 70mm (w x h x d) weight: 5.75kg i have 2...priced per 1!!