ASC Single 12" Subwoofer Kicker Square L3 L5 L7 Vented Port Sub Box Speaker Enclosure, Dimensions: Width 18-1/4" x Height 13-1/4" x Depth 16-1/4" By American Sound Connection - Walmart.com
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STSDA-ADM54B-PAIR | Speaker Poles w/ M20 Threading, 35mm Adapter, Adjustable Height – Sound Town Inc
SVS 3000 Micro Gloss Black Subwoofer - MICRO3000GB | Abt
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STSDA-50B Subwoofer Speaker Poles with Adjustable Height for 35mm/38mm – Sound Town Inc