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
Amazon.com: JBL Stage 6402 210W Max (70W RMS) 4" x 6" 4 ohms Stage Series 2-Way Coaxial Car Audio Speakers : Electronics
MB Quart Formula 2 Way Coaxial 90W 4 x 6 Inch Car Speakers with 4 Ohms Impedance, 1 Piece - Harris Teeter