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 -
Amazon.com: Facmogu 2PCS 8 Inch Full Range Audio Speakers, RMS 50W Peak 120W 4 Ohm, Car Vehicle Audio Full Range Drivers, Wide Range Bass Woofer DIY Loudspeaker Replacement - Yellow : Everything Else
Amazon.com: KICKER 40PSM34 4 Ohm Mini Weatherproof Speaker System for Motorcycle & ATV, 50 Watt, Durable Chrome Encasing, Black : Electronics
Amazon.com: Fielect 2Pcs DIY Magnetic Speaker 3W 4 Ohm Full Range Audio Speaker Stereo Woofer Loudspeaker Replacement for Arduino, 52mm Diameter : Electronics
Amazon.com: MIYAKO USA (TS-416) 4" Professional Grade Replacement for Speaker 50 watts Power at 4 ohms 10oz Magnet Round Speaker for Repairs Black (1 Pair) : Electronics
Amazon.com: PRV AUDIO 3MR50 3 Inch Midrange Speaker, 8 Ohm, 100 Watts Peak, 50 Watts Program Power PRO Loudspeaker for Portable PA System and Tower Speakers (Single) : Electronics