Amazon.com: uxcell 0.5W 8 Ohm DIY Magnetic Speaker 57mm Round Shape Replacement Loudspeaker for 4pcs : Electronics
Amazon.com: Jensen MS6007SR Pair of 6.5" Coaxial Waterproof Silver Speakers, 60 Watts Max Power, Frequency Response 65Hz-20kHz, Nominal Impedance 4 Ohms, 7-1/8" Grille Diameter : Electronics
5 Core PA Horn Speaker Indoor Outdoor Waterproof Loud 6 Inch Portable PA Speaker with 8 Ohm Impedance and 50 Watt Peak Power High-Performance Siren Speaker, Mounting Bracket HW 405
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 Sound System