Polk Audio SW100 10" Passive Radiator Speakers - Sold Together As A Pair #735 Good Used Working Cond | Reverb
DS18 HYDRO CF-X8TPNEO 8" Marine Water Resistant Wakeboard Tower Neodymium Speaker with Built-in passive Radiator Bass Enhancer, 1" Driver and RGB LED Light 550 Watts - Black Carbon Fiber
BASS SPEAKER PASSIVE Radiator Passive Bass Durable Fine Craftsmanship 90160 DIY $20.71 - PicClick AU
ACCUTON P280, passive radiator - ELTIM
Kicker 47KBRW10 ReFLEX™ 10" passive radiator — big bass without a ported enclosure at Crutchfield Canada
WinISD Tutorial - Passive Radiator - YouTube
Amazon.com: Bass Speaker Passive Radiator, Auxiliary Bass Rubber Vibration Plate Oval for Use in a Closed Cabinet to Enhance the Bass Performance of the Speaker(Black) : Electronics
Cheap DIY Passive Radiators | DIYMobileAudio.com Car Stereo Forum