Amazon.com: uxcell a15080600ux0275 Metal Shell Round Internal Magnet Speaker 2W 8 Ohm (Pack of 4) : Electronics
Amazon.com: uxcell a15102900ux0379 1W 8 Ohm Magnet Mini Loudspeaker MP3 MP4 Player Speaker 28mm Dia Pack of 4 : Electronics
JINGERL 1Pcs 4 Inch Audio Speaker Driver HiFi 4 8 Ohm 30W Full Range Altavoz Bookshelf Loudspeaker DIY Home Theater Amplifier (Color : Round 8Ohm 30W, Size : 4") : Amazon.com.au: Electronics
Skar Audio FSX65-4 6.5" 300 Watt 4 Ohm Pro Audio Midrange Loudspeaker, Each
Amazon.com: PRV AUDIO 8 Inch Midbass Speaker 8MB450-4 v2, 450 Watts Program Power, 2 in Voice Coil, 4 Ohm, 225 Watts RMS Pro Audio Mid Bass Woofer (Single) : Electronics
Amazon.com: CT Sounds STRATO-8-D4 1200 Watts Max 8 Inch Car Subwoofer Dual 4 Ohm : Electronics
Amazon.com: JINGERL 50W 4Ohm 8Ohm Car Subwoofer 4 Inch Woofers Speaker in Car Bass Speaker Long Stroke Loudspeaker for Automotive Sound Box IPC (Color : 1 pieces-4Ohm) : Electronics