This circuit uses TINE5532 three chips, with one level gain, one level buffer, and one level tone processing; Equipped with a power on/off silent circuit, there is basically no impact sound when turning on/off; Reverse polarity protection for power supply; Wide voltage regulation, capable of operating between DC9-29V; Built in boost module It can convert a single power supply into a 14.5V dual power supply to power the circuit, with a large dynamic range of sound and strong thrust, which can drive high-power rear . Two impedance interfaces have been designed for the output, making it convenient to connect different power amplifiers The low impedance interface can be connected to a pure post amplifier, while the high impedance interface can be directly connected in parallel to the input end of a combined amplifier or other audio equipment line with a pre amplifier Static power consumption: about 1W Frequency response: 20HZ-20KHZ Amplification gain: 14db Tone adjustment range: 15db Input impedance: 50K High impedance output impedance: 10K, output amplitude: 0.7Vrms Low impedance output impedance: 600 , output amplitude: 3.5Vrms Size:50x80mm Color: Material:ABS Package Contents: 1 set * NE5532 Preamp Tone Board(Only board set, without control panel) 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.