Audio System X15-1100 15" 550 Watt Dual-4-Ohm Kevlar Car Audio Subwoof — Showtime Electronics
Refurbished Sundown Audio SAv2 Subwoofer
AMPERE AUDIO AA-3.0 V4 (2000W RMS) 12 Inch Subwoofer | Dual 2 Ohm - Down4Sound Shop
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Basser - FBaudi07 Audi A4 B8 Avant Fit-Box subwoofer enclosure
Polk Audio db840DVC db Series 8" subwoofer with dual 4-ohm voice coils at Crutchfield
Amazon.com: New BOSS Phantom P156DVC 15" 2500 Watt Car Audio Subwoofer Sub Woofer DVC 4 Ohm : Electronics
KILOX104 - 10" 1000 Watts RMS Dual 4 Ohm 3" V.C. Subwoofer
Colossal Sounds Ultra U-18 18" 2500w Car Audio Subwoofer
Basser - FBaudi05 Audi A4 B6/B7 Avant Fit-Box subwoofer enclosure
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Audi A5 B&O Sound - Adding Subwoofer with Amp advice - AudiWorld Forums
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Audi A4 Subwoofer System for Gainesville Client
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GTX64 - Massive Audio Subwoofer 6" 250 Watts RMS Dual 4 Ohm Subwoofer
Harmony Audio HA-ML181 Monolith 18" Competition Sub 3500W Dual 1 Ohm Subwoofer | HA-ML181
C112D4 C1 Series 12" Subwoofer - Concrete Audio
BOSS Audio Phantom 12-Inch 2300W Car Audio Subwoofer Speakers (2 Pack) - Walmart.com
BASSER Audi A6 C7 Avant R - 8" Fit-Box Subwoofer Enclosure 8L
