SAFE & SECURE SHOPPING. 8” 800W Active Underseat Car Bass Box Audio Subwoofer Sub Speaker Amplifier 12V. Thank you for your cooperation! Speaker unit size: 8. Size(L X W X H): 350mm x 245mm x 85mm / 13.78 ” x 9.65″ x 3.3. Sound type: full frequency (with treble) subwoofer. The external configuration of high strength stainless steel horn protection net cover. 8 inch 800W high power design, with the volume controller. Low frequency ability of the bass horn, high quality low tone output. Fine workmanship and good performance. Easy to install, can be installed directly under the driver’s seat. Durable in use. We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need. Please allow 0.5-1 inch difference due to manual measurement. Although instruction is included. Professional Installation Is Highly Recommended! Installation instruciton not inclued. If you are satisfied with our item, could you kindly give us 5 stars feedback? Welcome to our store! In the sale of high-quality. Car and motorcycle accessories. Thank you in advance.