ported under seat subwoofer box

JBL Club 1200P Single 12 Inch Loaded Subwoofer Enclosure

MTX AUDIO RT8PT 8 Inch 240 Watt Car Loaded Universal Powered High Performance Amplified Tube Box Vented Subwoofer Enclosure, RCA Connectivity

QPower Quad 4 Hole 12 Inch Sealed Divided Speaker Box Subwoofer Enclosure

Boss Chaos CX122 12-Inch 1400 Watt Car Subwoofer and Q POWER QSBASS12-VENTED 12-Inch Single Heavy Duty Vented Subwoofer Enclosure Box

JBL Club 1000P Single 10 Inch Loaded Subwoofer Enclosure

Audison AVBX-12-D4-II AVBX 12 D4 II - 300mm 4+4ohm 1100W Sealed Subwoofer Box

Memphis Audio PRXE12SFT 12" LED Loaded Subwoofer Box + PRX800.1V2 800W Mono Amp Bundle w/ 4 Gauge Wiring Kit & LED Controller

Kicker 48TRTP122 Down-Firing 12" CompRT 2-Ohm Subwoofer Enclosure

Square Solobaric Dual Subwoofer Box Speaker Enclosure

Q Power QBomb Single 12 Inch Vented Subwoofer Sub Box with Black Bedliner Spray

Kicker 47QL7R122 12-Inch (30cm) Loaded Ported Quad Box, 2-Ohm

ATG Audio Dual 12" Loaded Slot Ported Subwoofer Enclosure - ATG212LBX

Alpine (2) S2-SB10V 10" Halo S-Series Preloaded Subwoofer Ported Enclosure S2-A120M Mono Amp and Rux Bundle

Alpine (2) S2-SB12V 12" Halo S-Series Preloaded Subwoofer Ported Enclosure S2-A120M Mono Amp and Rux Bundle

MB Quart Reference 6.5" Subwoofer with 1.5" Voice Coils for Car Audio, 1200W

Alpine W10S4 10-inch Single 4 Ohm Subwoofer

MTX 12" 1200W Dual Loaded Car Subwoofer Audio w/ Sub Box & Amplifier (Open Box)

Wet Sounds REVO 12 HP S4 V3 12" High Power 4 Ohm Subwoofer with REVO 12 SW-B GRILLE V3 - Black Salt Water Grille and PORTED-12-ENC 12" Rotomold Por...

Wet Sounds REVO 12 HP S4 V3 12" High Power 4 Ohm Subwoofer with REVO 12 XS-W-SS GRILLE V3 - White & Stainless XS Style Grille and PORTED-12-ENC 12"...

Wet Sounds REVO 12 HP S4 V3 12" High Power 4 Ohm Subwoofer with REVO 12 XS-G-SS GRILLE V3 - Gunmetal & Stainless XS Style Grille and PORTED-12-ENC ...

Wet Sounds REVO 12 HP S4 V3 12" High Power 4 Ohm Subwoofer with REVO 12 XS-B-SS GRILLE V3 - Black & Stainless XS Style Grille and PORTED-12-ENC 12"...

QPower Dual 10" Subwoofer Enclosure, Sub Box for Ford F-150 SuperCrew 2004-2008

Wet Sounds Zero Series 2Ω 12” Subwoofer w/ XZ Black Grille and PORTED-12-ENC 12" Rotomold Ported Enclosure