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We manufacture car speaker, car woofer, car amplifier, and we are chinese supplier, and manufacturer. Thus, our products have competitive quality and price. We also can do OEM factory. And if possbile, we can do similar quality with some brand. And the similar rate can reach 85%-98%. Also our own quality is also very good, we should do DOMP TEST, and other left factory test. And our amplifier, we also have to do aging test. Thus, about the details , i think if possible, you can browse our web-site.