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) Can be bridged: NOT power: 1000W RMS power: 500W, 4 Ohm load (one 4 Ohm speaker) RMS power: 300W, 8 Ohm load (one 8 Ohm speaker) RMS power: 500W, 8+8 Ohm load (two 8 Ohm speakers used in parallel) Frequency response: 20HZ-20KHZ at -2DB Distortion: ≤1% at 1KHZ (4 ohms) Board Size: 200 x 130 x 42mm/7.9 x 5.1 x 1.7 inch (LxWxH) Net weight: 0.8KG/1.8LB Input working voltage: AC100-120V 60HZ, and cp4 connection Input working voltage: AC200-240V 50HZ, and cp4B are not connected Input working voltage error: +/-10% Need to add 24v fan: Yes Amplifier main power supply voltage: +79V, 0V, and -79V Output voltage for preamplifier board: +15V, 0V, and -15V Fan output voltage: 24v Input sensitivity: Amplitude: 1.5V; Frequency: 1KHZ; Waveform: Sine wave Magnification: 30 times Signal input ports: IN (signal input) and G (signal ground) Speaker port: SPK- and SPK+ Power port: AC INPUT L and N Noise: ≤1 MV The speaker has output short-circuit protection: Yes (automatic reset after removing the short circuit) Boot delay anti-shock sound 1-3 seconds Material:plastic+Metal Package Contents: 1 Amplifier Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.