Generally, they are over 200 mm, and they are installed in specially made bass boxes. The smaller the size of the bass speaker, the harder and more brittle the sound effect; the bigger the size, the deeper the sound effect and the heavier the aftertone.
At present, the market uses a ready-made subwoofer to make bass, which saves the trouble of making speakers, but the effect is not as good as that of speakers. The subwoofer is just a low-end product. Subwoofer can be divided into active and passive flat. Active subwoofer is a built-in power amplifier with independent power supply to drive the subwoofer to drive the subwoofer. Passive subwoofer has no built-in power amplifier, which directly drives the subwoofer by on-board power amplifier.
Bass can greatly improve the car's sound sense, especially in high-speed driving, bass will be greatly attenuated, adding a bass system is necessary. Bass speakers can generally be divided into two types: single voice coil and double voice coil. Its impedance is 2Ω, 4Ω, 6Ω, 8Ω，which are commonly used in European loudspeakers.
