What is this? A basic-reflex speaker subwoofer box utilizes ventilation holes (called bass reflex ports) to enhance bass response. At the same amplifier power, a bass-reflex speaker box delivers more output power than a sealed cabinet. Compared to sealed cabinets, bass-reflex cabinets can provide deeper bass. This car audio enclosure features a sleek and modern design that blends easily into any room, complementing various interior design styles and most car interior styles. What will I get? Wooden Speaker Enclosure Material: Wooden Color: Gray Inner diameter of the bell mouth: 145mm/5.71inch Size: 215mmx550mmx190mm/8.46inchx21.65 inchx7.48inch(W*L*H) In the package of: 1Pcs x Truck Speaker Box(Include Sound-absorbing cotton) Are there any advantages? Wooden car audio speaker boxes have a long lifespan, are resistant to decay, and have low maintenance costs. Wood possesses natural acoustic properties, resonance strongly and effectively transmitting vibrations, fully showcasing the beautiful tones produced by various instruments through the cabinet and amplifier. How to use it? Easy installation, good fit, and convenient speaker wire connection allow for easy installation and convenient use, letting you fully enjoy your music. What should I notice? Please allow slight measurement errors due to manual measurement.