Applied Sciences | Free Full-Text | Analysis and Application of Screens for Acoustic Impedance in a Speaker Box with a Passive Radiator to Decrease Standing-Wave Influence
Can passive radiators always enhance bass response, regardless of the speaker cabinet to which it is attached? - Quora
3D Printed Passive Radiator, watch it dance! Now you can make the perfect radiator for any speaker enclosure : r/diyaudio
Kicker 47KBRW12 ReFLEX™ 12" passive radiator — big bass without a ported enclosure at Crutchfield
Boston Acoustics SPG-TR TunableRadiator Oval passive radiator for use with Boston's SPG555 subwoofers at Crutchfield
Passive Radiator Configuration - DIY Audio Projects - StereoNET International