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OEM 4inch Full Range Midrange Woofer Surround Center Audio Speaker. Wide Frequency Range: Delivers sound from 80Hz to 12KHz for full-range audio. OEM and ODM Services: Offers full customization, minor customization, and flexible options. High Temperature Resistance: Designed with good temperature resistance for durability. High Protection Grade: Features a high protection grade for reliable performance. Annual Production Capacity: Capable of producing 3,000,000 pieces of speakers annually. Global Export Experience: Exporting to North America, Europe, and Asia since 2013. 100% Quality Inspection: All finished products undergo visual and function inspection.