audio Input music and microphone input volume is different? The sensitivity and gain of capacitive mics, moving cyclones,and Musical Instruments are different, resulting in an imbalance in volume. Is the phase of the output signal inconsistent due to the principle difference between capacitive microphone, moving coil microphone and musical instrument: Can be easily solved! Transistor voice amplifier features: Do not change the original microphone timbre, do not increase the line bottom noise, only increase the sensitivity of the microphone<br><br>Specification: A: Without Bluetooth Colour: Black Material: Metal<br><br>Package Contents: 1 x wire rod set 1 x Mic Amplifier<br><br>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.