?RELIABLE QUALITY?We are a team of musicians and professional audio engineers who develop our products according to the needs of our customers and our own. Based on our worry-free guarantee, your satisfaction is our priority. ?No noise pure amplification?Transistor amplifier circuit adopts CLASS-A class amplifier circuit design, with higher-order transistor MP5+ lower audio output impedance, stronger load. ?Requires 48V Phantom Power?To ensure proper functionality, the MIC Preamplifier necessitates a 48V Phantom Power Supply. It is important to verify the availability of this power supply before making a purchase. ?SPECIFICATIONS? Gain: 28dB (load 1kohm); Frequency Response: 20-20kHZ; Max output level (0.5% THD): 8.3dBv; Output Impedance: 135 ohms; Current: 3mA. ?Add +28db of Clean Gain?This professional in-line microphone preamp delivers +28DB gain Class A crystal amplifier circuit in the noise, effectively solve the microphone volume due to low sensitivity caused by the problem.