Rockford Fosgate Punch PBR400X4D Compact Chassis 400-Watt Full-Range 4-Channel Amplifier. Voltage: 12 Volts. Mounting Type: Surface Mount. Number of Channels: 4. Output Power: 400 Watts. Specification Met: Cea-2006. Model: PBR400X4D. Warranty Description: 1-year parts and labor warranty when purchased from an authorized Rockford Fosgate reseller. UPC: 780687351427. Part Number: PBR400X4D. Included Components: PBR400X4D. Unit Count: 1.0 Count. Rated RMS Power: 50 Watts x 4 @ 4-Ohm OR 100 Watts x 4 @ 2-Ohm OR 200 Watts x 2 @ 4-Ohm Bridged. Full Range Class D topology. Differential inputs with high level auto turn-on feature. 8 AWG power/ground connector. Remote-Out feature when using high level inputs. Real time output and power supply thermal sensing. Selectable Fixed 12dB/Octave Butterworth Crossovers. Compact design for stealth installations (1.5" x 4.25" x 6.75").