Amazon.com: Focal F100IWSUB8 High Power Passive Bass-Reflex Subwoofer : Electronics
Dual 18' ' Professional Theater Banquet Sub Bass Audio Speaker High Power Passive Bass Reflex Subwoofer - China PA Speaker and PA System price | Made-in-China.com
DAD - LIVE15SA - Bass reflex subwoofer acoustic loudspeaker amplified in AB 600W 130 dB SPL
Single Bass Reflex Subwoofer
80W passive bass reflex subwoofer for 100V and 8 ohm sound systems
80W passive bass reflex subwoofer for 100V and 8 ohm sound systems
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Line 501 Slim Sub Subwoofer Bass Reflex Speakers | active | 60W RMS | total power: 120W max | 20.32 cm woofer (8") | on 4 feet | frequency response: 50 - 100 Hz | impedance: 4 ohms | volume control | White