Brand new and high quality Features: Bass radiator, also known as passive speaker, is used to replace the inverted tube. The subwoofer made with the radiator offers performance comparable to traditional bass reflex subwoofers. Low frequency depth is equivalent to that of a ported design. The response speed is noticeably faster than ported types, providing advantages similar to a sealed enclosure. Completely eliminates the drawback of ported structures wind noise caused by the port. Enhances bass performance, provides better output, and allows for convenient tuning. Increases low-end potential and improves overall sound quality. Vibration membrane only; other accessories shown in the picture are not included. Specifications: Material: Metal + Rubber Type: Accessory Color: As shown in pictures Dimensions (Diameter): 55 x 44 x 39 cm / 2.17 x 1.73 x 1.54 in Quantity: 1 Set Notes: 1. No retail packaging included. 2. Please allow 01 cm error due to manual measurement. Ensure you are comfortable with this before purchasing. 3. Due to differences in monitor displays, the actual color may vary slightly from the image. Package includes: 2 Pieces x Passive Radiator