Kicker 48TRTP102 Sealed downward-firing enclosure with CompRT® 10" shallow-mount subwoofer and passive radiator at Crutchfield
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The Workhorse Passive GRS 8" Mini Subwoofer Kit
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Amazon.com: Focal PSB200 Sealed Enclosure with 8" Passive Subwoofer : Electronics
IWISTAO 6.5 Inch HIFI Passive Subwoofer 60W 8 Ohms 35-300HHz 86±3dB – IWISTAO HIFI MINIMART
DB Technologies LVX PSW18 - 1200W 18" Passive Subwoofer
IWISTAO HIFI 8 /10 /12 Inch Passive Subwoofer Empty Cabinet Honeycomb – IWISTAO HIFI MINIMART
KGEAR GPZ Passive Subwoofer & 2 Column Array Speaker System - Sound Productions
NavAtlas Underseat Passive Subwoofer System - NX310WP - Dennis Kirk
JBL Synthesis SSW-3 Dual 10" In-Wall Passive Subwoofer – Digital Media Systems, Inc.
Audison Package Factory Radio Upgrade Channel Amp with 10" Passive Subwoofer Box - Breakers Stereo and Performance
KICKER 48TRTP82 8" Down-Firing Subwoofer & Passive Radiator Enclosure - Black - Used Very Good - Creative Audio
Buy Electro-Voice ELX200-12S Passive Subwoofer | Sam Ash Music
Cerwin Vega CVI-118S 18-Inch Passive Subwoofer | PSSL ProSound and Stage Lighting
Buy Wholesale China Speakers Subwoofer, 2x12" Passive Speaker Box + 18" Active Speaker Box & Speakers Subwoofer at USD 240 | Global Sources
DS18 SQ82 8" Car Audio Subwoofer plus 8" Passive Subwoofer on High End Aluminum Enclosure 1200 Watts
