Strapping Capability: Strap 2 Amps Together For Twice The Power (2 Ohm Stable)Variable Low Pass Filter: 50 HZ - 150 HZVariable Subsonic Filter: 15 HZ - 40 HZVariable 0 - 18 Db Bass BoostPhase Shift Selector: 0 Or 180degVariable Input Gain ControlInput Sensitivity SelectorPower and Protection Led IndicatorsThermal- Overload and Speaker Short ProtectionRca Line Level InputsRca Line Outputs For System BuildingChrome Plated Rca Connectors and Screw TerminalsRemote Subwoofer Level ControlFreq Resp: 20 Hz - 250 Hz (+/-3 Db)Signal-To-Noise Ratio: 105 DbThd @ Rms Output: 0.01%Damping Factor: 125+Dim: 10-W X 2.25-H4000w Max2000W X 1 @ 4 OHM2200W X 1 @ 2 OHMDIM: 15-L