This Package Includes: 1 x Boss Monoblock Amplifier 1 x Boss 4 Channel Amplifier The Boss R1100M 1100-Watt Mono Car Audio Power Amplifier offers a MAX output of 1100-Watt and an RMS output of 250-Watt. This Class A/B amplifier features a MOSFET power supply, an impedance of 2 ohms, a line output, low pass crossover, and an illuminated Boss logo. The Boss R1100M 1100-Watt Mono Car Audio Power Amplifier is the perfect amp to power your car audio system. RMS Power: 250-Watt x 1 Channel @ 4 Ohm Boss Illuminated Logo Class A/B The Boss R1004 4 channel amplifier features a MAX power handling of 400-Watt and a RMS power handling of 50-Watt. The Class A/B circuit design run cooler and more efficiently with low distortion and high reliability. This class is intermediate between Class A and B, with the two active elements conducting more than half of the time which are best used for speakers. Other features include a Hi/Low pass crossover, a variable bass boost and is 2 ohm stable. Trimode Capable 2 Ohm Stable.