Kicker PS52504 5-1/4" 2-way motorcycle speakers (4-ohm) at Crutchfield
New pair (2) Full Range 4.5" 4 1/2" Shielded Woofer set 4 Ohm Surround Speaker | eBay
Phase Tech 3 Way Surround Speaker 4 Ohm 150W Home Audio PC-SURR-IIWH 644216209408 | eBay
5 CORE Car Subwoofer Audio Speaker Pair - 8 inch 4 Ohm, 100 Watt Power,1” Voice Coil and Foam Surround for Vehicle Stereo Sound System 110mm Magnet Loudspeaker Woofer Replacement WF 8110G 2 PCS - Walmart.com
15 35W 5 Inch Amplifier Passive Speaker 3D 4 Ohm Wooden Bookshelf Speaker Home Audio Center Surround 2.0 Passive Speaker A Pair|Bookshelf Speakers| - AliExpress
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
Pyle Pl463bl Blue Label 4x6 Inch 240w 3 Way Triaxial Car Speaker Stereo, 120w Rms / 240w Max, Butyl Rubber Surround, 4 Ohm 89db, Black, Set Of 2 : Target
5 Core 6" Inch Subwoofer Car Audio 4 Pieces 700W Peak Power Sub Woofer Loudspeaker Wide Range High Power Bass Surround Sound Stereo 4 Ohm, 72 mm Magnet Car Speakers WF 672 4 PCS - Newegg.com
Amazon.com: Gravity WZP69 Warzone Series 6x9 inch 4 Ohm Pro Midrange Coaxial Loud Corrugated Surround Speaker 4-Ohms with 800W Max, 1 Speaker Car Audio High Standard Reliability Testing : Electronics
20w Stereo Surround Center Speakers 4 Ohm 3d Surround Speakers Wooden Home Audio Theater Center Hifi 5.1 Passive Speakers - Speakers - AliExpress