For Subwoofer Passive, 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 Subwoofer Passive has been well received by many customers and enjoyed a good reputation in many countries. Seer Audio Subwoofer Passive have characteristic design & practical performance & competitive price, for more information on the Subwoofer Passive, please feel free to contact us.