Name: diaphragm radiator. It is an important component used to enhance the low frequency performance in the speaker, and its features and functions are mainly reflected in the following aspects: Simplified structure: the diaphragm does not contain voice coil, magnets and other components, and consists of only the diaphragm and the support structure, which is usually fixed on or connected through the suspension system. Resonance Enhancement: Through the resonance effect between the diaphragm and the air inside the cabinet, resonance can be generated in the low frequency band to enhance the depth of bass dive and sound pressure level. Role Enhancement of low-frequency performance: passive vibration supplements the sound pressure output of the woofer, making the bass tighter and . Optimized cabinet design: Reduces inverted tube airflow disturbance, reduces standing wave interference, and improves mid- and high-frequency separation. Reduced energy consumption: Matching the active unit reduces its working amplitude and prolongs its service life Color: As Shown Material: Iron + Plastic Package Contents: 1 x 5.25 inch radiation resonator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.