Specifications: 1. Amplifier model: J115D-AMP 2. Amplifier type: Class D digital amplifier (switching power supply) 3. Board color: Blue 4. Channel: Mono (not stereo) 5. Can be bridged: NOT 6. Peak power: 1000W 7. RMS power: 500W, 4 Ohm load (one 4 Ohm speaker) 8. RMS power: 300W, 8 Ohm load (one 8 Ohm speaker) 9. RMS power: 500W, 8+8 Ohm load (two 8 Ohm speakers used in parallel) 10. Frequency response: 20HZ-20KHZ at -2DB 11. Distortion: THD 1% at 1KHZ (4 ohms) 12. Board Size: 200 x 130 x 42mm/7.9 x 5.1 x 1.7"" (LxWxH) 13. Net weight: 650g 14. Input working voltage: AC100-120V 60HZ, CP3 and cp4 connection 15. Input working voltage: AC200-240V 50HZ, CP3 and cp4B are not connected 16. Input working voltage error: +/-10% 17. Need to add 24v fan: Yes 18. Amplifier main power supply voltage: +79V, 0V, and -79V 19. Output voltage for preamplifier board: +15V, 0V, and -15V 20. Fan output voltage: 24v 21. Input sensitivity: Amplitude: 1.5V; Frequency: 1KHZ; Waveform: Sine wave 22. Magnification: 30 times 23. Signal input ports: IN (signal input) and G (signal ground) 24. Speaker port: SPK- and SPK+ 25. Power port: AC INPUT L and N 26. Noise: 1 MV 27. The speaker has output short-circuit protection: Yes (automatic reset after removing the short circuit) 28. Boot delay anti-shock sound 1-3 seconds