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Amazon.com: DS18 SLC-MD10 Car Subwoofer Audio Speaker - 10" in. Polypropylene Cone, Black Steel Basket, Dual Voice Coil 4 Ohm Impedance, 800W MAX Power and 200W RMS Power, for Vehicle Stereo Sound (
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Amazon.com: Pair of Sundown Audio LCMR-6.5 Pro Audio 6.5" 100W RMS 4 Ohm Midrange Speakers : Electronics
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Amazon.com: Pyle PLG64 6.5" 1200W Car Audio Mid Bass/Midrange Subwoofer Speaker Set, 2 Pair with Yellow CD P.P. Cone, 4 Ohm Impedance, and Edge Suspension : Electronics
Amazon.com: DS18 PRO-X12.4M Loudspeaker - 12" Midrange,with Bullet, 900W Max, 4 Ohms,2" Kapton VC Premium Quality Audio Door Speakers for Car or Truck Stereo Sound System (1 Speaker) … : Electronics
Amazon.com: uxcell 3 Inch Mounting Dia 5W 4 Ohm Midrange Speaker Replacement for Car : Electronics
Amazon.com: 6.5" Three-Way Sound Speaker System - 180 W RMS/360W Power Handling w/ 4 Ohm Impedance and 3/4'' Piezo Tweeter for Car Component Stereo, Round Shaped Pro Full Range Triaxial Loud Audio -
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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: Recoil RCX4 Echo Series 4-Inch Car Audio Coaxial Speaker System : Electronics