Amazon.com: Dayton Audio RSS315HF-4 12" Reference HF Subwoofer 4 Ohm : Electronics
Alpine R2-W8D4 8" R-Series "R2" Subwoofer, Dual 4-Ohm, 350 Watt RMS - Creative Audio
Memphis Audio PRX1224 Power Reference Series 12" dual voice coil subwoofer * selectable 2- or 4-ohm impedance - Breakers Stereo and Performance
Alpine RS-W12D4 R-Series shallow-mount 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Kicker 43C124 12" Comp C12 Series Sub 150W RMS 4 Ohm SVC Car Subwoofer | KIC16-43C124-N
DS18 IXS10.4S 10" Car Subwoofer 1200 Watts 4-Ohm SVC Shallow Mount, shallow mount subwoofer
DAYTON AUDIO RS180-4 Reference Speaker Driver Midbass 60W 4 Ohm 89dB 39Hz - 3600Hz Ø18cm - Audiophonics
LAV FSN041.00: Full-range speaker, 40 W, neodymium, 4 inch (10 cm), steel at reichelt elektronik
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NEW ALPINE R-W10D4 10" 2250W WOOFER DUAL 4-OHM REINFORCED SUBWOOFER BASS SPEAKER | eBay
Aiyima 1pc 5.25 Inch Woofer Audio Speakers Driver 100w 4 8 Ohm High Power Fever Loudspeaker Subwoofer Speaker Diy Home Theater - Speakers - AliExpress
LFDriver 40CM XSP15A 4Ohm - Part of XSP-15A 15" powered speaker
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PAIR DS18 SRW10.4 Shallow 10" Subwoofer 800 Watt 4 Ohm Car Audio Thin Sub Woofer | eBay
Audio Music Speakers Woofer Loudspeaker | Audio Speaker 4ohm 6.5 Inch - 1pc 6.5 Inch - Aliexpress
Epique E150HE-44 5-1/2" DVC MMAG Extended Range Subwoofer 4 Ohm per Coil
Amazon.com: Memphis Audio 15-M610D4 10" MOJO Dual 4-Ohm Subwoofer - 500 wRMS : Electronics
Amazon.com: Facmogu 3 inch Tweeter Speakers HiFi Full Range Woofer Loudspeaker, 2 PCS 4 Ohm Anti-Magnetic Speakers for 2.0/2.1 Boom Box Satellites Speaker DIY (4Ω) : Electronics
Amazon.com: Ground Zero Iridium 16,5 cm / 6.5" Subwoofer - 4 Ohm - 100 WRMS : Electronics
Dayton Audio DCS305-4 12" Classic Subwoofer 4 Ohm
DS18 SRW10.4 10" Car Subwoofer 700 Watts Svc 4-Ohm Shallow Mount
AIYIMA 6.5 Inch Woofer Audio Car Speaker Driver 4 Ohm 50W Bass Auto Waterproof Bass Speaker Aluminum Basin DIY Sound System - AliExpress
5 Core 6x4 Inch PAIR Replacement DJ Speaker/ Loudspeaker With Full Range Loud Sound/ 40W Peak Power, 4 Ohm Voice Coil- SP-6X4 1 Pair | Reverb
2x Gravity 15 Inch 2400 Watt Car Audio Subwoofer w/ 4 Ohm DVC 15 in. Sub - Pair | eBay
 Subwoofer 40 Watt 32–9500 Hz 070009 | eBay")