Amazon.com: Dayton Audio DAEX32U-4 Ultra 32mm Exciter 20W 4 Ohm : Electronics
Amazon.com: Rockford Fosgate PPS4-6 6.5" 800W 4-Ohm Impedance Mid-Range Car Speakers 4 Pack with Fiber Reinforced Paper Cone and Stamp Cast Aluminum Frame : Electronics
Amazon.com: uxcell 10W 4 Ohm 3 Inch 78x78x39mm Anti-Magnetic Speaker Tweeter Speakers 2pcs : Electronics
Amazon.com: Fielect 5W 4 Ohm DIY Magnetic Speaker Audio Speakers 77mm Diameter Round Shape Replacement Loudspeaker 1Pcs : Electronics
Amazon.com: Fielect 2Pcs DIY Magnetic Speaker 3W 4 Ohm Full Range Audio Speaker Stereo Woofer Loudspeaker Replacement for Arduino, 52mm Diameter : Electronics
Amazon.com: PRV AUDIO 6MB100-4 Pair of 6.5 Inch Midbass Speaker for Pro Car Audio, 4 Ohm, 50 Watts RMS Power, 200 Watts Max Power Mid Bass Factory Replacement Loudspeaker (Pair) : Electronics
Amazon.com: Gikfun 4Ohm 40mm Diameter 3W Full Range Audio Speaker Stereo Woofer Loudspeaker for Arduino (Pack of 2pcs) EK1794 : Electronics
Amazon.com: (2) Skar Audio Npx10-4 10" 400 Watt 4-Ohm Neodymium Pro Audio MID-Range Loudspeaker - 2 Speakers : Electronics
Amazon.com: Dayton Audio DC130BS-4 5-1/4" Classic Shielded Woofer 4 Ohm : Electronics
Amazon.com: RI Audio 12'' Subwoofer 1800 Watts Max Dual 4 Ohm Energy Series RI-PW12D4 Single, Black : Electronics
Amazon.com: Audiopipe TS-CVR6 Subwoofer 6-inch Woofer 150 Watt Max 4 Ohm DVC 1.5” 4-Layer Dual Voice Coil BASV : Electronics
Amazon.com: CT Sounds Meso-6.5-D4 6.5 Inch Car Subwoofer Dual 4 Ohm, 800 Watts Max
Amazon.com: Rockford Fosgate P3D4-12 Punch P3 DVC 4-Ohm 12-Inch 600-Watt RMS 1200-Watt Peak Subwoofer : Electronics
Amazon.com: Gikfun 2" 4Ohm 3W Full Range Audio Speaker Stereo Woofer Loudspeaker for Arduino (Pack of 2pcs) EK1725 : Electronics
Amazon.com: PRV AUDIO 6.5 Inch Speakers Midbass Woofer 6MB200-4 v2 200 Watts Program Power, 4 Ohm, 100 Watts RMS, 1.5 in Voice Coil, Perfect for Small Custom Enclosures for Pro Car Audio
Amazon.com: Skar Audio FSX8-4 8" 350 Watt 4 Ohm Pro Audio Midrange Loudspeaker, Each : Electronics
Amazon.com: Pyle Car Three-Way Speaker System - Pro 4 x 6 Inch 180W 4 Ohm Mid Tweeter Component Audio Sound Speakers For Car Stereo w/ 30 Oz Magnet Structure, 2” Mount Depth
Amazon.com: GRS 3FR-4 Full Range 3" Speaker Driver 4 Ohm : Electronics
Amazon.com: Skar Audio (2) FSX65-4 (2) FSX65-4 300-Watt 6.5-Inch 4 Ohm MID-Range Loudspeakers - 2 Speakers Black : Everything Else
Amazon.com: DS18 SLC12S Car Subwoofer Audio Speaker - 12" in. Paper Glass Fiber Cone, Black Steel Basket, Single Voice Coil 4 Ohm Impedance, 500W MAX Power and Foam Surround for Vehicle Stereo
Amazon.com: BOSS Audio CXX124DVC 12 Inch Car Subwoofer - 1200 Watts Maximum Power, Dual 4 Ohm Voice Coil, Sold Individually : Electronics
Amazon.com: Visaton FRS7-4 2.5" Full-Range Speaker 4 Ohm : Electronics
Amazon.com: Pyramid 6.5 Inch Car Woofer Speaker - 300 Watt High Powered White Injected Polypropylene Cone Car Audio Sound Component Speaker System w/ High-Temperature Kapton Voice Coil, 4 Ohm, 40oz Magnet - WX65X : Electronics
Amazon.com: KICKER 44CWCD104 CompC 10" 500 Watt Dual 4-Ohm Car Audio Subwoofer Sub CWCD104 : Electronics
