American Bass VFL 4480.1D Class D Mono Hybrid Amplifier Max power at 1 ohm: 4480W Frequency response: 15Hz to 300KHz; Input level: 6V to 0.2V; Signal to noise ratio: 85db Remote bass knob; Variable low pass filter: 50Hz to 220Hz; Subsonic filter: OFF to 50Hz; Damping factor: Over 150; Xover selector: HP/Full/BPF (Band pass works) Fuse: 120A; Four way protection: DC, speaker short, thermal, voltage Dimensions: 20 x 7.5 x 3.5 inches