GHXAMP Bass Radiator 113MM Low Frequency Passive Radiator Speaker Vibration Diaphragm Rubber For 4 INCH 5 INCH Subwoofer SpeakerBrand: GHXAMP Note: This is not speaker ,it is Bass radiator. Intermediate iron plate 1. 5MM thick Peripheral rubber 0. 65MM thick, 60 degrees Net weight: 66 grams Material: Rubber Brief description: Bass radiator, also known as passive speaker, is used to replace the inverted tube, the subwoofer made with the radiator and the traditional back subwoofer compared to the following advantages, low frequency dive depth and backward , But the sense of