Pioneer 12" 1400 W Max Power, Single 4-ohm Voice Coil, IMPP cone, Rubber Surround Component Subwoofer BLUE TS-A123R - Best Buy
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
Kicker PS52504 5-1/4" 2-way motorcycle speakers (4-ohm) at Crutchfield
Hertz SX165NEO 6.5" Coaxial Powersport Speakers, 4 Ohm, 200 W
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: 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: 4 Inch Bullet Tweeter Full Range Speaker 4 Ohm, 5~15 Watt HiFi Tweeter Midrange Bass Integrated for Vocals Home Stereo Surround Sound Theater, 61Hz-18.5KHz Frequency Response 88dB : Electronics
Goldwood Rubber Surround 8 in. Woofer 190-Watt 4 ohm Speaker GW-8024 - The Home Depot
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
AET HT-200SB 3-1/2" Passive Surround Speaker Pair 4 Ohm