4 hole subwoofer box

Cerwin Vega XED Series Bass Package (2) 12" 4 Ohm SVC Subwoofers and 300W RMS Mono Amplifier at 2 Ohms

Cerwin Vega XED3001D Monoblock Amplifier + XED12V2 12" SVC Subwoofer Car Audio Bass Package 200W RMS at 4-Ohm

Alpine S2-W10D4 10" S-Series Dual 4 Ohm Car Subwoofer & KTE-10G.3 Grille Bundle

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

Hifonics ELITE 15 Inch Car Mount Subwoofer with Dual 4 Ohm Voice Coil Speaker 3000 Watt Peak Power Mobile Amplifier System, Black

MTX 12-Inch 1200-Watt Car Audio Dual Loaded Subwoofer Box Enclosure & Crunch PowerDriveX 1000 Watt 2 Channel Exclusive Blue A/B Car Stereo Amplifier

Kicker 48CWRT104 CompRT 10" 4-Ohm DVC Subwoofer

Memphis Audio SRXS1244V 12" Street Reference Dual 4-Ohm Shallow Mount Subwoofers with SRX300.1V Mono 2-Ohm 300 Watt Amplifier

ATG Audio Transcend Series 15" Dual 4-Ohm Subwoofer - ATG-TS15X2.4

Kicker L7S104 L7S 10" Subwoofer, Dual Voice Coil, 4-Ohm & 52GL710 Grill Bundle

Kicker 46L7T124 L7T L7-Thin 12" Subwoofer, Dual Voice Coil, 4-Ohm & 52GL712 Grill Bundle

Alpine R2-W10D4 10" R-Series "R2" Subwoofer, Dual 4-Ohm, 750 Watt RMS

Alpine S2-W12D4 12" S-Series Dual 4 Ohm Car Subwoofer, 1800W Max, 600W RMS

PowerBass S-1004D - 10" Dual 4-Ohm Subwoofer

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

Vivitar Home Theater Soundbar System with 4 3” Full Frequency Drivers,2 Microphones, 2 Speakers and 6.5” Subwoofer

Memphis PRX824v2 Power Reference 8" 2/4 Ohm Selectable Impedance Subwoofer

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

2) MB Quart DS1-304 800 Watt 12 Inch Slim Shallow Subwoofers Car/Truck DVC Subs

Kicker 48CDF104 Comp 10" Subwoofer in Down Firing enclosure, 4-Ohm

Hifonics ELITE 12 Inch Car Mount Subwoofer with Dual 4 Ohm Voice Coil Speaker 1600 Watt Peak Power Mobile Amplifier System, Black

Kicker 43VC124 Comp 12-inch Subwoofer in Ported Enclosure, 4-Ohm

2) Boss CH10DVC 10" 3000W Car Subwoofers Subs Woofers 4 Ohm+Vented Box Enclosure