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KICKER CS Series 6-3/4" 2-Way Car Speakers with Polypropylene Cones (Pair) Yellow/Black 46CSC674 - Best Buy
Speaker - 40mm Diameter - 4 Ohm 3 Watt : ID 3968 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: Pyle 4'' x 6'' Three Way Sound Speaker System - Pro Mid Range Triaxial Loud Audio 240 Watt per Pair w/ 4 Ohm Impedance and 3/4'' Piezo Tweeter for Car Component
GRS 3FR-4 Full-Range 3" Speaker Driver 4 Ohm
2Pcs 2" Inch 4 Ohm 3 W Speaker Full Range For Mini Stereo Speakers Accessory Box 20CB
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