The horn is low and stuffy, and it doesn't sound loud and pleasant. This phenomenon can be improved. First, adjust the tone and level potentiometer to the high-pitched segment. If the effect is not obvious, debug from the amplifier circuit. Take the following circuit diagram as an example:
The capacity of the bypass capacitor should be reduced in the circuit diagram, and the capacity of the red circle capacitor is drawn in the figure. Thereby enhancing the treble, reducing the treble bypass component and increasing the attenuation bass component.