2pcs Passive Bass Speaker Diaphragm Plate for Woofer and Loudspeaker Enhanc

Passive radiators work similarly to vents and only increase the amount they subtract
Air turbulence as air rapidly escapes the tube at high volumes
Passive radiators work in with active drivers at low frequencies, sharing the acoustic load and reducing driver excursion
Bass radiators, also known as "hum cones", are used to inverted tubes with radiators and traditional rear-mounted woofers
Passive radiator systems use sound that would otherwise be trapped in an enclosure to excite resonance, making it easier for speaker systems to produce the deepest tones

What's in the box
2 × Speaker Repair