18 inch sub box

QPower Single 12 Inch Sub Enclosure, Universal Downfire/Behind Seat Speaker Box for Truck Audio Applications

Q-Power Single 10-Inch Universal Downfire/Behind Seat Subwoofer Sub Box (2 Pack)

QPower Non HD Crew Cab Behind Seat Dual 12 Inch Subwoofer Box (2 Pack)

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

QPower QTW12 Single 12" Sealed Car Audio Subwoofer Sub Box Enclosures, Pair

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

QPower QBASS Dual 12 Inch Car Audio Subwoofer Enclosure Box, Charcoal (2 Pack)

Q Power QBomb 10 Inch Single Vented Subwoofer Sub Box with Black Bedliner Spray

QPower QBOMB12V Dual 12" Vented Ported Subwoofer Sub Box with Bedliner Spray

Q Power QBOMB15V Dual 15" Vented Port Subwoofer Sub Box w/ Bedliner Spray

Hifonics HFX12D4 12 Inch Subwoofer, 800 Watt Max 400 Watt RMS Single Speaker for Car & Powersports Vehicles

QPower SHALLOW110 Single 10 Inch Vented Shallow Subwoofer Sub Box Enclosure

QPower 15 Inch Heavy-Duty Single Vented Carpet Covered Durable Car Audio Vehicle Subwoofer Enclosure Woofer Box, Charcoal Gray

Kicker CSC Speaker Upgrade Compatible With Chevy Silverado Crew Cab Pickup 19-26

MTX 12" 400 Watt RMS Dual Loaded 1200 Watt Car Subwoofer Enclosure Audio with Sub Box, Mono Block & 8-Gauge Amplifier Complete Wiring Installation Kit

Kicker 52VCVR122 CompVR 12" single subwoofer in vented box, 2-ohm

HIFONICS 12" 1600W Car Audio Subwoofers, DVC Speakers (2 Pack), Bundled with QPower Ported Enclosure Box

Crunch 12" 800 W 4 Ohm Car Subwoofer Speaker (2 Pack) w/ Audio Stereo Amplifier

QPower 12 Inch Heavy-Duty Dual Sealed Carpet Covered Durable Car Audio Vehicle Subwoofer Enclosure Woofer Box, Charcoal Gray

QPower 10 Inch Heavy-Duty Single Vented Carpet Covered Durable Car Audio Vehicle Subwoofer Enclosure Woofer Box, Charcoal Gray

QPower QBOMB12VL 12 Inch Dual Vented Ported Car Subwoofer Sub Box Enclosure

Planet Audio AC12D 12 Inch 3600 Watt 4 Ohm Dual Voice Coil Car Audio Subwoofers w/ Stamped Basket, Polypropylene Cone & Foam Surround, Black, (2 Pack)

QPower QBASS Dual 15-Inch Vented MDF Subwoofer Sub Box Enclosure

Pyle 8 Inch 1600W DVC 4 Ohm Car Audio Subwoofer Speaker Set with 40 Oz Magnet and 1.5 Inch 4 Layer Voice Coil, Black (2 Pack)

QPower 15 Inch Heavy Duty Single Vented Carpet Covered Durable Car Audio Extra Large Vehicle Subwoofer Enclosure Woofer Box, Charcoal Gray

Pyle " 1000 Watts Slim Active Subwoofer System - AQTB8.5

Q-Power Shallow Single 12 Inch Heavy Duty Sealed MDF Material Truck Audio Subwoofer Enclosure Box with Durable Carpeted Exterior, Charcoal Gray

QPower 12 Inch Heavy-Duty Single Sealed Carpet Covered Durable Car Audio Vehicle Subwoofer Enclosure Woofer Box, Charcoal Gray

Kicker 52DCVR122 CompVR 12" dual subwoofers in vented box, 2-ohm

MB Quart DS1-204 8 Inch 400 Watt MAX 200 Watt RMS 4 Ohm Dual Voice Coil, Shallow Slim Subwoofer Speaker Pair for Car Audio Sound System

Pyle 6.5'' 600W Dual Voice Coil 4 Ohm Subwoofer (PLPW6D) - Black

Kicker 51CWQ102 CompQ 10” 2-Ohm Subwoofer