Amazon.com: Rockville SBG1184 18" 1000 Watt Passive 4-Ohm Pro DJ Subwoofer, MDF/Pole Mount : Musical Instruments
Amazon.com: KICKER TRTP 10-inch (25cm) Thin Down Firing Subwoofer and Passive Radiator Enclosure, 2-Ohm, RoHS Compliant : Electronics
Amazon.com: Kenwood SW-15HT SW15HT Passive 100 Watts Subwoofer Home Theater Speaker Subwoofer Surround Sound Front Firing 8 Ohms : Electronics
Hifonics ZRX-12BP Auto-Subwoofer passiv 1000W : Amazon.de: Elektronik & Foto
Amazon.com: KICKER TRTP 12-inch (30cm) Thin Down Firing Subwoofer and Passive Radiator Enclosure, 2-Ohm, RoHS Compliant : Electronics
ESX V1600A | Active Subwoofer Cube - 20 cm (8 Inch) Active Subwoofer with 8 Inch Passive Membrane : Amazon.de: Electronics & Photo
Ground Zero GZHW 25XSPL-D2-25 cm Passive Subwoofer with 2500 Watt (RMS: 1200 Watt) : Amazon.de: Electronics & Photo
Amazon.com: Sound Storm Laboratories PB8 Car Subwoofer and Amp Package – Built-in Amplifier, 8 Inch Subwoofer with Passive Radiator, Remote Subwoofer Control : Everything Else
Amazon.co.jp: Earthquake Sound SLAPS-M12 12-inch Passive Radiator for Home or Car Subwoofer by Earthquake Sound : 家電&カメラ