For 4 inch mid woofer, everyone has different special concerns about it, and what we do is to maximize the product requirements of each customer, so the quality of our 4 inch mid woofer has been well received by many customers and enjoyed a good reputation in many countries. HONGCHANG(CHANGZHOU) ELECTRONIC CO.,LTD 4 inch mid woofer have characteristic design & practical performance & competitive price, for more information on the 4 inch mid woofer, please feel free to contact us.