Jinan remind car modified car stereo sound absorption characteristics are not the same kinds of materials for sound absorption is different, but there are differences in the same kind of material to absorb the force of each frequency
also. Therefore, due to the different interior decoration materials and chairs, there will be some impact on the sound effects. General interior decoration, car seat, roof and flooring materials such as cloth and skin rugs, inside of the use of synthetic leather, as well as listening and the doors and windows, in the high-frequency sound-absorbing characteristics will be more complex formation, in hearing on the high frequency will be relatively strong, so the relatively high frequency soft music, it will not easy to make people irritable and tired.
Jinan aluminum mold refers to the processing of aluminum and plate material, aluminum alloy die Jinan can also be divided into cold-rolled and hot-rolled aluminum die die lowest growth rate, the main difference is the difference between
the anodic oxidation of aluminum mold mold, hot Jinan mold can do anodized aluminum. Cold-rolled and hot-rolled aluminum mold mold aluminum uses different spread rapidly, cold-rolled aluminum sheet used for mold mold Jinan class, hot stamping dies for aluminum stretched on. The same material due to the different production process, its physical properties vary greatly. Also known as plastic forming, aluminum during deformation by the force and deformation mode
(stress - strain state) is divided into: casting, forging, extrusion, spinning, drawing, rolling, forming (cold , deep drawing) and other processing methods.