Mono Class D. 2 Ohms Stable. Variable Subsonic Filter. RCA Output for Multi-Amp Installations. 4 Gauge Power Connector. Military Spec Componentary. F.R.A.T. FUSION Regulated Amplifier Technology. FUTRANZ Efficient Heat Sink Design Technology. Variable Bass Boost, HP & LP Electronic Crossover. Dim (HxDxW) 2 1/4 x 8 1/2" x 8 1/4"