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Front- and down-firing subwoofers -- Teufel Audio blog
FF12 Front Firing Subwoofer - Earthquake Sound Shop
Amazon.com: Klipsch Reference R-121SW 12” Front-Firing Subwoofer with revamped Spun-Copper thermoformed crystalline Polymer woofers and an All-Digital Amplifier for Premium Sound in Black : Electronics
SVS PB16-Ultra 16 Inch Front-Firing Powered Subwoofer - Audiolab Stereo & TV
Caisson de basses down-firing | Teufel Blog
REL Acoustics 212/SX 12 inch 2 Front-firing Active Driver, Rear and Down- firing Passive Subwoofer - HiFi Collector
DB10 10-inch Low Frequency Powered Subwoofer (Black Ash) | Fluance
Amazon.com: Earthquake Sound FF6.5 6.5-Inch Front Firing Subwoofer black : Electronics