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: Rockford Fosgate R2D4-10 Prime 4-Ohm DVC 10” Subwoofer 250 Watts RMS / 500 Watts Max : Electronics
Amazon.com: CT Sounds OZONE-10-D4 1600 Watts Car Subwoofer Dual 4 Ohm : Electronics
Amazon.com: Aexit 10W Watt Fixed Resistors 4 Ohm 5% Ceramic Cement Power Single Resistors Resistor x5pcs : Industrial & Scientific
Amazon.com: Gravity 15 Inch 1600 Watt Car Audio Subwoofer w/ 4 Ohm DVC Power (Single) : Electronics
Amazon.com: Cadence Q75T 1 Inch Hybrid Tweeters, 200 Watts Max Power, 4 Ohm, 100 Watts RMS Car Audio, Pair : Electronics
Mini Hobby Speaker - 2 inch 4 Ohms
Amazon.com: Genius Audio GFX-55X4 Full Range Powered Car Amplifier Multichannel 1200 Watts Max Class AB 2-Ohm Stable with Power Protection System to Boost Speaker and Woofer Performance : Electronics
Speaker - 3" Diameter - 4 Ohm 3 Watt : Amazon.ca: Everything Else
Amazon.com: BOSS Audio Systems MC900B Amplifier for ATV UTV Car Marine - 500 High Output, 4 Channel, 2/4 Ohm, Bluetooth Multi-Function Remote, RCA Out, Weatherproof, Use Amp with Stereo and Subwoofer, Crossover : Electronics
Amazon.com: DS18 SXE-4000.4D/RD Car Amplifier Stereo Full-Range Class D 4-Channel 275x4 RMS @4 OHM 4000 Watts - Powerful and Compact Amp for Speakers in Car Audio System : Electronics
CQRobot Speaker 3 Watt 4 Ohm Compatible with Arduino Motherboard, 2.54mm Dupont Interface. It is Ideal for a Variety of Small Electronic Projects.
Amazon.com: MTX TN10-04 10-Inch Single 4-OHM Subwoofer 150-Watt RMS : Electronics
Skar Audio FSX65-4 6.5" 300 Watt 4 Ohm Pro Audio Midrange Loudspeaker, Each
Amazon.com: Fielect 4Pcs 5W 4 Ohm DIY Magnetic Speaker Audio Speakers 77mm Diameter Round Shape Replacement Loudspeaker : Electronics
Amazon.com: Eminence Legend CA154 15" Bass Guitar Speaker, 300 Watts at 4 Ohms, Black : Musical Instruments
New Pair SSL SS12 12" 800 Watt Car Audio Subwoofer 4 Ohm SVC 400W RMS Sub
Amazon.com: Skar Audio SDR-12 D4 12" 1200 Watt Max Power Dual 4 Ohm Car Subwoofer : Electronics
Amazon.com: CT Sounds STRATO-10-D4 2500 Watts Max 10 Inch Car Subwoofer Dual 4 Ohm : Everything Else
Amazon.com: PyleUsa Two-Way Component Speaker System - One Pair 6.5'' Two-Way Component Kit, 360 Watts w/ 4 Ohm Impedance and 1'' High-Temperature ASV Voice Coil (Pair) - PL650CBL : Everything Else
Amazon.com: Rockford Fosgate R2D4-12 Prime R2 DVC 4 Ohm 12-Inch 250 Watts RMS 500 Watts Peak Subwoofer : Everything Else
5pcs 4 ohm 4RΩJ 10 watt Axial Ceramic Cement Power Resistor 10W: Amazon.com: Industrial & Scientific
NVX VCW124v3 (VCW124 Version 3) 2400 Watt Peak (1200W RMS) 12" VC-Series v3 Dual 4-
Amazon.com: Rockville RSG15.4 15" 3-Way 1500 Watt 4-Ohm Passive DJ/Pro Audio PA Speaker : Musical Instruments
Amazon.com: MTX 3512-04 12" 500 Watt SVC 4-ohm Car Audio Subwoofer+Amplifier+Amp Wire Kit : Electronics
