The Boss R1004 4 channel amplifier features a MAX power handling of 400 watts and a RMS power handling of 50 watts. The Class A/B circuit design runs 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 Signal to Noise Ratio:Greater than 95 dB

BOSS R1004 400W 4-Channel RIOT Full Range Car Audio High Power Amplifier; Dimensions (L x W X H): 7.75 x 9 x 2 inches

400 Watt High Output 4 Channel Amplifier; Max Power @ 2 Ohms: 100 Watts x 4; RMS Power @ 4 Ohms: 38 Watts x 4

Number of Output Channels: 4; High and Low Level Inputs; Amplifier Class: Class A/B

Thermal Overload & Speaker's Short Protection; Soft Turn-On Circuit

Frequency Response: 12 Hz to 22 kHz ±1 dB

Trimode Capable

2 Ohm Stable

MOSFET Power

Variable Bass Boost

Signal to Noise Ratio: Greater than 95 dB

Total Harmonic Distortion (THD): 0.05%

Weight: 3.6 pounds

Part Number: R1004

1 Year Manufacturer Warranty