Pacific Auto Network will have a long plug on the subwoofer, generally with three or four pins. The plug can be connected to the signals of the speakers on both sides, instead of being connected together, it can be directly connected to the output of the two speakers in the trunk, and the corresponding positive and negative poles can be connected to the corresponding speaker wires.

subwoofers can be roughly divided into active subwoofers and passive subwoofers. An active subwoofer refers to a subwoofer with a built-in power amplifier, which is usually cylindrical in shape without an additional power amplifier. The disadvantage of this subwoofer is that the heat dissipation is not ideal and the power is not very large. However, the barrel shape usually produces unnecessary vibration, which makes the subwoofer controllable.

in contrast, the passive subwoofer needs an external power amplifier when it works. The shape and power selection of this subwoofer can be more flexible, and the effect will naturally be more ideal. In addition, active speakers can be further divided into sealed boxes and perforated boxes. The former is more suitable for deep symphonies, while the latter is more suitable for pop music. In principle, subwoofer and loudspeaker work in exactly the same way.

Only the diameter of the diaphragm is larger, generally 8-1 inches, and a sound box for vibration is added. In terms of evaluation index, the subwoofer is basically the same as the speaker, so I won't introduce the specific content here, just talk about the numerical requirements. The frequency response is generally below 2Hz and the rated impedance is 4? About, the sensitivity is generally greater than 9 dB/w/m.. (Photo/Text/Photo: Pacific Auto Network Chen Jie 2)