The subwoofer determines the sound characteristics of the car speaker, which is relatively important to choose, and the most common ones are as follows.

Paper basin, and there are coated paper basin, paper-based wool basin, compact basin, etc., paper basin has the advantages of natural tone, cheap, good rigidity, light material and high sensitivity, the disadvantage is poor moisture resistance, manufacturing consistency is difficult to control.
Bulletproof cloth, has a wide frequency response and low distortion, is a love of strong bass choice, the disadvantage is high cost, complex production process, sensitivity is not high and the light music effect is not ideal. Wool woven basin, soft texture, it is very good for soft music and light music performance, but the bass effect is not good, lack of strength and shock. Polypropylene basin, with good consistency and low distortion characteristics, is widely used in high-end car loudspeakers.
In addition, some high-end car speakers also use new materials such as PPTA diaphragms and polyether imide mid-range basins. The performance of the PPTA diaphragm is similar to that of the metal material, but there is no sharp and harsh sound that often appears in the metal material, so that the speaker can have a delicate and vivid sound characteristics.
Polyether imide middle register basin (PEI) is a mixture of ether and poly珗 imide, which is used as a middle register and high register basin material with superior physical properties. PEI can produce a clear sound with high rigidity, durability, high resistance to heat, chemicals and wind and rain.