The CAB-M165 is one of the best  bang for the buck 5 Channel amplifiers available on the market today. The amplifiers are a class A/B amplifier that deliver 100 watts a channel @ 4 ohm, and over 150 watts a channel @ 2ohm full range. The M-165 also delivers 1,000 watts into a sub channel @ 1ohm for over 1,600 watts total across 5 channels! The amplifier also comes with a bass knob for adjustment of the subwoofer output. 

• 4ga Power & Ground inputs 
• Operational Voltage: 9.0v -16.0v
• Full Range Channels
• Power: 150 Watts RMS X 4 @ 2 ohm at 14.4v
• Power: 100 Watts RMS  X 4 @ 4 ohm at 14.4v
• Subwoofer Channel
• Power: 600 Watts RMS @ 2 ohm
• Power: 1,000 Watts RMs @ 1 ohm
• Frequency Response: 20-20,000 Hz 
• Signal Noise Ratio: 85dB
• Input Sensitivity: 22,000 Ohms
• Input Sensitivity: 100MV-6V
• T.H.D. : <0.05%
• Bass Frequency: 30Hz-80Hz
• Low Pass Frequency: 40Hz-4,000Hz
• High Pass Frequency: 50Hz-8,000Hz
• Bass Boost: 0-12dB

ATTN: Owners manual does say these are rated at 800 watts rms on the sub channel. However, Audio Apexs website states 1000 watts rms on the sub channel for the M165.