["Description:\nbrand new and high quality\nFeatures:\nIt is used to replace the inverted tube. Made of high-quality material, durable and stable to use.\nA passive radiator is used to adjust the , the designer can adjust the overall tone of the speaker.\nThe radiators have great effect on enhancing the , booster, convenient debugging. Each speaker behind with a diaphragm right unit,can increase the lower potential of the , the sound more excellent.\nAttention: it is passive radiator,not speaker.No voice coil or drive magnet.\nPassive Radiator only, other accessories demo in the picture is not included!\n\nSpecifications:\nItem Type: Passive Radiator\nMaterial: Plastic+Metal\nSize: (Optional)\n4 inch: horn diameter: 116mm/4.5in, diagonal twisting hole spacing: 108mm/4.2in, opening hole: 95mm/3.7in, counterbore depth+height: 2.5mm+33mm/0.09+1.2in\n5 inch: horn diameter: 147mm/5.7in, diagonal twisting hole spacing: 139mm/5.4in, opening hole: 118mm/4.6in, counterbore depth+height: 3.8mm+37mm/0.14+1.4in\n6.5 inch: horn diameter: 178mm/7in, diagonal twisting hole spacing: 168mm/6.6in, opening hole: 145mm/5.7in, counterbore depth+height: 4mm+47mm/0.15+1.8in\nColor: Black\nQuantity: 2 PCS\n\nNote:\nNo retail package.\nTransition: 1cm=10mm=0.39inch\nPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage Includes:\n2 x Passive Radiator"]