The sound system is actually very afraid of external environment, especially water vapor erosion. Once it is affected by moisture and water, it can easily affect the sound quality and effect, and even cause problems inside the entire sound system. Moreover, speakers used outdoors may also face situations such as bumps and impacts, which can cause significant damage to the speaker body. Therefore, waterproofing, scratch resistance, and wear resistance are the top priority for their protection. The coating on the surface of the speaker provides comprehensive protection. The use of elastic polyurea coating sprayed on the surface of the speaker can prevent rain, water, corrosion, impact, and impact. Elastic polyurea coating has strong characteristics of wear resistance, aging resistance, corrosion resistance, and water resistance. It can be said to be very suitable for use on the surface of the speaker and can help the speaker isolate all external damage.