Model number: RAL Power Amplifier MA  Amplifier, PA Amplifier, Professional Amplifier, karaoke Amplifier, Audio, PA Audio, Professional Audio, Audio System, Karaoke Audio, Mixer, PA Mixer, Professional Mixer, Karaoke Speaker. Features:  1. The power is soft to start 2. Bridge/Stereo transfer output 3. Can switch 150Hz low frequency output, 4. Protection functions: Over-flow, over-heat, over-load, and short-circuit 5. High Performance DC Fans 6. High Efficiency And Low Emission , Toroidal Transformer Specifications:  Model: CA2, CA4, CA6, CA9, CA12, CA18 8Ω Stereo Power  CA2: 150W; CA4: 250W; CA6: 400W; CA9: 520W; CA12: 800W; CA18: 1200W 4Ω Stereo Power CA2: 225W; CA4: 375W; CA6: 600W; CA9: 780W; CA12: 1200W: CA18: 1800W 8ΩBridge Power  CA2:450W; CA4: 750W; CA6: 1200W; CA9: 1560W: CA12: 2400W; CA18: 3600W Freq.Resp(+0/0.31W/8Ω  20Hz-20KHz, -3Db/100KHz   20Hz-20KHz(+0/0.5dB) THD+N  CA270dB Gross Weight CA2: 21.25KG; CA4: 23.75KG; CA6: 25KG: CA9: 27KG; CA12: 44KG; CA18: 47KG Dimensions(CM)  CA2, CA4, CA6, CA9: L59cm × W57cm × H15cm CA12, CA18: L65cm × W58.5cm × H22cm